Merge tag 'linux-can-next-for-6.2-20221212' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
linux-can-next-for-6.2-20221212

this is a pull request of 39 patches for net-next/master.

The first 2 patches are by me fix a warning and coding style in the
kvaser_usb driver.

Vivek Yadav's patch sorts the includes of the m_can driver.

Biju Das contributes 5 patches for the rcar_canfd driver improve the
support for different IP core variants.

Jean Delvare's patch for the ctucanfd drops the dependency on
COMPILE_TEST.

Vincent Mailhol's patch sorts the includes of the etas_es58x driver.

Haibo Chen's contributes 2 patches that add i.MX93 support to the
flexcan driver.

Lad Prabhakar's patch updates the dt-bindings documentation of the
rcar_canfd driver.

Minghao Chi's patch converts the c_can platform driver to
devm_platform_get_and_ioremap_resource().

In the next 7 patches Vincent Mailhol adds devlink support to the
etas_es58x driver to report firmware, bootloader and hardware version.

Xu Panda's patch converts a strncpy() -> strscpy() in the ucan driver.

Ye Bin's patch removes a useless parameter from the AF_CAN protocol.

The next 2 patches by Vincent Mailhol and remove unneeded or unused
pointers to struct usb_interface in device's priv struct in the ucan
and gs_usb driver.

Vivek Yadav's patch cleans up the usage of the RAM initialization in
the m_can driver.

A patch by me add support for SO_MARK to the AF_CAN protocol.

Geert Uytterhoeven's patch fixes the number of CAN channels in the
rcan_canfd bindings documentation.

In the last 11 patches Markus Schneider-Pargmann optimizes the
register access in the t_can driver and cleans up the tcan glue
driver.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

20 files changed, 574 insertions, 220 deletions

diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 86e95e9d6533..03ccb7cfacaf 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -290,8 +290,7 @@ static int c_can_plat_probe(struct platform_device *pdev)
 		goto exit;
 	}
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	addr = devm_ioremap_resource(&pdev->dev, mem);
+	addr = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
 	if (IS_ERR(addr)) {
 		ret =  PTR_ERR(addr);
 		goto exit;
diff --git a/drivers/net/can/ctucanfd/Kconfig b/drivers/net/can/ctucanfd/Kconfig
index 6e2073351a8f..f52407f5c5d8 100644
--- a/drivers/net/can/ctucanfd/Kconfig
+++ b/drivers/net/can/ctucanfd/Kconfig
@@ -23,7 +23,7 @@ config CAN_CTUCANFD_PCI
 
 config CAN_CTUCANFD_PLATFORM
 	tristate "CTU CAN-FD IP core platform (FPGA, SoC) driver"
-	depends on HAS_IOMEM && (OF || COMPILE_TEST)
+	depends on HAS_IOMEM && OF
 	select CAN_CTUCANFD
 	help
 	  The core has been tested together with OpenCores SJA1000
diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index 9bdadd716f4e..0aeff34e5ae1 100644
--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@@ -345,6 +345,15 @@ static struct flexcan_devtype_data fsl_imx8mp_devtype_data = {
 		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
 };
 
+static struct flexcan_devtype_data fsl_imx93_devtype_data = {
+	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
+		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_RX_MAILBOX |
+		FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_AUTO_STOP_MODE |
+		FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SUPPORT_ECC |
+		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX |
+		FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR,
+};
+
 static const struct flexcan_devtype_data fsl_vf610_devtype_data = {
 	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_RX_MAILBOX |
@@ -532,9 +541,14 @@ static inline int flexcan_enter_stop_mode(struct flexcan_priv *priv)
 		ret = flexcan_stop_mode_enable_scfw(priv, true);
 		if (ret < 0)
 			return ret;
-	} else {
+	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR) {
 		regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
 				   1 << priv->stm.req_bit, 1 << priv->stm.req_bit);
+	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_AUTO_STOP_MODE) {
+		/* For the auto stop mode, software do nothing, hardware will cover
+		 * all the operation automatically after system go into low power mode.
+		 */
+		return 0;
 	}
 
 	return flexcan_low_power_enter_ack(priv);
@@ -551,7 +565,7 @@ static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)
 		ret = flexcan_stop_mode_enable_scfw(priv, false);
 		if (ret < 0)
 			return ret;
-	} else {
+	} else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR) {
 		regmap_update_bits(priv->stm.gpr, priv->stm.req_gpr,
 				   1 << priv->stm.req_bit, 0);
 	}
@@ -560,6 +574,12 @@ static inline int flexcan_exit_stop_mode(struct flexcan_priv *priv)
 	reg_mcr &= ~FLEXCAN_MCR_SLF_WAK;
 	priv->write(reg_mcr, &regs->mcr);
 
+	/* For the auto stop mode, hardware will exist stop mode
+	 * automatically after system go out of low power mode.
+	 */
+	if (priv->devtype_data.quirks & FLEXCAN_QUIRK_AUTO_STOP_MODE)
+		return 0;
+
 	return flexcan_low_power_exit_ack(priv);
 }
 
@@ -1974,6 +1994,8 @@ static int flexcan_setup_stop_mode(struct platform_device *pdev)
 		ret = flexcan_setup_stop_mode_scfw(pdev);
 	else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_SETUP_STOP_MODE_GPR)
 		ret = flexcan_setup_stop_mode_gpr(pdev);
+	else if (priv->devtype_data.quirks & FLEXCAN_QUIRK_AUTO_STOP_MODE)
+		ret = 0;
 	else
 		/* return 0 directly if doesn't support stop mode feature */
 		return 0;
@@ -1992,6 +2014,7 @@ static int flexcan_setup_stop_mode(struct platform_device *pdev)
 static const struct of_device_id flexcan_of_match[] = {
 	{ .compatible = "fsl,imx8qm-flexcan", .data = &fsl_imx8qm_devtype_data, },
 	{ .compatible = "fsl,imx8mp-flexcan", .data = &fsl_imx8mp_devtype_data, },
+	{ .compatible = "fsl,imx93-flexcan", .data = &fsl_imx93_devtype_data, },
 	{ .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
 	{ .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
 	{ .compatible = "fsl,imx53-flexcan", .data = &fsl_imx25_devtype_data, },
@@ -2299,8 +2322,16 @@ static int __maybe_unused flexcan_noirq_suspend(struct device *device)
 	if (netif_running(dev)) {
 		int err;
 
-		if (device_may_wakeup(device))
+		if (device_may_wakeup(device)) {
 			flexcan_enable_wakeup_irq(priv, true);
+			/* For auto stop mode, need to keep the clock on before
+			 * system go into low power mode. After system go into
+			 * low power mode, hardware will config the flexcan into
+			 * stop mode, and gate off the clock automatically.
+			 */
+			if (priv->devtype_data.quirks & FLEXCAN_QUIRK_AUTO_STOP_MODE)
+				return 0;
+		}
 
 		err = pm_runtime_force_suspend(device);
 		if (err)
diff --git a/drivers/net/can/flexcan/flexcan.h b/drivers/net/can/flexcan/flexcan.h
index 025c3417031f..91402977780b 100644
--- a/drivers/net/can/flexcan/flexcan.h
+++ b/drivers/net/can/flexcan/flexcan.h
@@ -68,6 +68,8 @@
 #define FLEXCAN_QUIRK_SUPPORT_RX_MAILBOX_RTR BIT(15)
 /* Device supports RX via FIFO */
 #define FLEXCAN_QUIRK_SUPPORT_RX_FIFO BIT(16)
+/* auto enter stop mode to support wakeup */
+#define FLEXCAN_QUIRK_AUTO_STOP_MODE BIT(17)
 
 struct flexcan_devtype_data {
 	u32 quirks;		/* quirks needed for different IP cores */
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 0bdec28e7c85..8e83d6963d85 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -9,20 +9,20 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/can/dev.h>
 #include <linux/ethtool.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
-#include <linux/iopoll.h>
-#include <linux/can/dev.h>
-#include <linux/pinctrl/consumer.h>
-#include <linux/phy/phy.h>
 
 #include "m_can.h"
 
@@ -369,9 +369,14 @@ m_can_txe_fifo_read(struct m_can_classdev *cdev, u32 fgi, u32 offset, u32 *val)
 	return cdev->ops->read_fifo(cdev, addr_offset, val, 1);
 }
 
+static inline bool _m_can_tx_fifo_full(u32 txfqs)
+{
+	return !!(txfqs & TXFQS_TFQF);
+}
+
 static inline bool m_can_tx_fifo_full(struct m_can_classdev *cdev)
 {
-	return !!(m_can_read(cdev, M_CAN_TXFQS) & TXFQS_TFQF);
+	return _m_can_tx_fifo_full(m_can_read(cdev, M_CAN_TXFQS));
 }
 
 static void m_can_config_endisable(struct m_can_classdev *cdev, bool enable)
@@ -472,19 +477,16 @@ static void m_can_receive_skb(struct m_can_classdev *cdev,
 	}
 }
 
-static int m_can_read_fifo(struct net_device *dev, u32 rxfs)
+static int m_can_read_fifo(struct net_device *dev, u32 fgi)
 {
 	struct net_device_stats *stats = &dev->stats;
 	struct m_can_classdev *cdev = netdev_priv(dev);
 	struct canfd_frame *cf;
 	struct sk_buff *skb;
 	struct id_and_dlc fifo_header;
-	u32 fgi;
 	u32 timestamp = 0;
 	int err;
 
-	/* calculate the fifo get index for where to read data */
-	fgi = FIELD_GET(RXFS_FGI_MASK, rxfs);
 	err = m_can_fifo_read(cdev, fgi, M_CAN_FIFO_ID, &fifo_header, 2);
 	if (err)
 		goto out_fail;
@@ -528,9 +530,6 @@ static int m_can_read_fifo(struct net_device *dev, u32 rxfs)
 	}
 	stats->rx_packets++;
 
-	/* acknowledge rx fifo 0 */
-	m_can_write(cdev, M_CAN_RXF0A, fgi);
-
 	timestamp = FIELD_GET(RX_BUF_RXTS_MASK, fifo_header.dlc) << 16;
 
 	m_can_receive_skb(cdev, skb, timestamp);
@@ -549,7 +548,11 @@ static int m_can_do_rx_poll(struct net_device *dev, int quota)
 	struct m_can_classdev *cdev = netdev_priv(dev);
 	u32 pkts = 0;
 	u32 rxfs;
-	int err;
+	u32 rx_count;
+	u32 fgi;
+	int ack_fgi = -1;
+	int i;
+	int err = 0;
 
 	rxfs = m_can_read(cdev, M_CAN_RXF0S);
 	if (!(rxfs & RXFS_FFL_MASK)) {
@@ -557,16 +560,26 @@ static int m_can_do_rx_poll(struct net_device *dev, int quota)
 		return 0;
 	}
 
-	while ((rxfs & RXFS_FFL_MASK) && (quota > 0)) {
-		err = m_can_read_fifo(dev, rxfs);
+	rx_count = FIELD_GET(RXFS_FFL_MASK, rxfs);
+	fgi = FIELD_GET(RXFS_FGI_MASK, rxfs);
+
+	for (i = 0; i < rx_count && quota > 0; ++i) {
+		err = m_can_read_fifo(dev, fgi);
 		if (err)
-			return err;
+			break;
 
 		quota--;
 		pkts++;
-		rxfs = m_can_read(cdev, M_CAN_RXF0S);
+		ack_fgi = fgi;
+		fgi = (++fgi >= cdev->mcfg[MRAM_RXF0].num ? 0 : fgi);
 	}
 
+	if (ack_fgi != -1)
+		m_can_write(cdev, M_CAN_RXF0A, ack_fgi);
+
+	if (err)
+		return err;
+
 	return pkts;
 }
 
@@ -900,14 +913,12 @@ static int m_can_handle_bus_errors(struct net_device *dev, u32 irqstatus,
 	return work_done;
 }
 
-static int m_can_rx_handler(struct net_device *dev, int quota)
+static int m_can_rx_handler(struct net_device *dev, int quota, u32 irqstatus)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
 	int rx_work_or_err;
 	int work_done = 0;
-	u32 irqstatus, psr;
 
-	irqstatus = cdev->irqstatus | m_can_read(cdev, M_CAN_IR);
 	if (!irqstatus)
 		goto end;
 
@@ -932,13 +943,13 @@ static int m_can_rx_handler(struct net_device *dev, int quota)
 		}
 	}
 
-	psr = m_can_read(cdev, M_CAN_PSR);
-
 	if (irqstatus & IR_ERR_STATE)
-		work_done += m_can_handle_state_errors(dev, psr);
+		work_done += m_can_handle_state_errors(dev,
+						       m_can_read(cdev, M_CAN_PSR));
 
 	if (irqstatus & IR_ERR_BUS_30X)
-		work_done += m_can_handle_bus_errors(dev, irqstatus, psr);
+		work_done += m_can_handle_bus_errors(dev, irqstatus,
+						     m_can_read(cdev, M_CAN_PSR));
 
 	if (irqstatus & IR_RF0N) {
 		rx_work_or_err = m_can_do_rx_poll(dev, (quota - work_done));
@@ -951,12 +962,12 @@ end:
 	return work_done;
 }
 
-static int m_can_rx_peripheral(struct net_device *dev)
+static int m_can_rx_peripheral(struct net_device *dev, u32 irqstatus)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
 	int work_done;
 
-	work_done = m_can_rx_handler(dev, NAPI_POLL_WEIGHT);
+	work_done = m_can_rx_handler(dev, NAPI_POLL_WEIGHT, irqstatus);
 
 	/* Don't re-enable interrupts if the driver had a fatal error
 	 * (e.g., FIFO read failure).
@@ -972,8 +983,11 @@ static int m_can_poll(struct napi_struct *napi, int quota)
 	struct net_device *dev = napi->dev;
 	struct m_can_classdev *cdev = netdev_priv(dev);
 	int work_done;
+	u32 irqstatus;
 
-	work_done = m_can_rx_handler(dev, quota);
+	irqstatus = cdev->irqstatus | m_can_read(cdev, M_CAN_IR);
+
+	work_done = m_can_rx_handler(dev, quota, irqstatus);
 
 	/* Don't re-enable interrupts if the driver had a fatal error
 	 * (e.g., FIFO read failure).
@@ -1014,7 +1028,9 @@ static int m_can_echo_tx_event(struct net_device *dev)
 	u32 txe_count = 0;
 	u32 m_can_txefs;
 	u32 fgi = 0;
+	int ack_fgi = -1;
 	int i = 0;
+	int err = 0;
 	unsigned int msg_mark;
 
 	struct m_can_classdev *cdev = netdev_priv(dev);
@@ -1024,34 +1040,34 @@ static int m_can_echo_tx_event(struct net_device *dev)
 
 	/* Get Tx Event fifo element count */
 	txe_count = FIELD_GET(TXEFS_EFFL_MASK, m_can_txefs);
+	fgi = FIELD_GET(TXEFS_EFGI_MASK, m_can_txefs);
 
 	/* Get and process all sent elements */
 	for (i = 0; i < txe_count; i++) {
 		u32 txe, timestamp = 0;
-		int err;
-
-		/* retrieve get index */
-		fgi = FIELD_GET(TXEFS_EFGI_MASK, m_can_read(cdev, M_CAN_TXEFS));
 
 		/* get message marker, timestamp */
 		err = m_can_txe_fifo_read(cdev, fgi, 4, &txe);
 		if (err) {
 			netdev_err(dev, "TXE FIFO read returned %d\n", err);
-			return err;
+			break;
 		}
 
 		msg_mark = FIELD_GET(TX_EVENT_MM_MASK, txe);
 		timestamp = FIELD_GET(TX_EVENT_TXTS_MASK, txe) << 16;
 
-		/* ack txe element */
-		m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK,
-							  fgi));
+		ack_fgi = fgi;
+		fgi = (++fgi >= cdev->mcfg[MRAM_TXE].num ? 0 : fgi);
 
 		/* update stats */
 		m_can_tx_update_stats(cdev, msg_mark, timestamp);
 	}
 
-	return 0;
+	if (ack_fgi != -1)
+		m_can_write(cdev, M_CAN_TXEFA, FIELD_PREP(TXEFA_EFAI_MASK,
+							  ack_fgi));
+
+	return err;
 }
 
 static irqreturn_t m_can_isr(int irq, void *dev_id)
@@ -1083,7 +1099,7 @@ static irqreturn_t m_can_isr(int irq, void *dev_id)
 		m_can_disable_all_interrupts(cdev);
 		if (!cdev->is_peripheral)
 			napi_schedule(&cdev->napi);
-		else if (m_can_rx_peripheral(dev) < 0)
+		else if (m_can_rx_peripheral(dev, ir) < 0)
 			goto out_fail;
 	}
 
@@ -1243,10 +1259,17 @@ static int m_can_set_bittiming(struct net_device *dev)
  * - setup bittiming
  * - configure timestamp generation
  */
-static void m_can_chip_config(struct net_device *dev)
+static int m_can_chip_config(struct net_device *dev)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
 	u32 cccr, test;
+	int err;
+
+	err = m_can_init_ram(cdev);
+	if (err) {
+		dev_err(cdev->dev, "Message RAM configuration failed\n");
+		return err;
+	}
 
 	m_can_config_endisable(cdev, true);
 
@@ -1370,18 +1393,25 @@ static void m_can_chip_config(struct net_device *dev)
 
 	if (cdev->ops->init)
 		cdev->ops->init(cdev);
+
+	return 0;
 }
 
-static void m_can_start(struct net_device *dev)
+static int m_can_start(struct net_device *dev)
 {
 	struct m_can_classdev *cdev = netdev_priv(dev);
+	int ret;
 
 	/* basic m_can configuration */
-	m_can_chip_config(dev);
+	ret = m_can_chip_config(dev);
+	if (ret)
+		return ret;
 
 	cdev->can.state = CAN_STATE_ERROR_ACTIVE;
 
 	m_can_enable_all_interrupts(cdev);
+
+	return 0;
 }
 
 static int m_can_set_mode(struct net_device *dev, enum can_mode mode)
@@ -1595,6 +1625,7 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev)
 	struct sk_buff *skb = cdev->tx_skb;
 	struct id_and_dlc fifo_header;
 	u32 cccr, fdflags;
+	u32 txfqs;
 	int err;
 	int putidx;
 
@@ -1651,8 +1682,10 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev)
 	} else {
 		/* Transmit routine for version >= v3.1.x */
 
+		txfqs = m_can_read(cdev, M_CAN_TXFQS);
+
 		/* Check if FIFO full */
-		if (m_can_tx_fifo_full(cdev)) {
+		if (_m_can_tx_fifo_full(txfqs)) {
 			/* This shouldn't happen */
 			netif_stop_queue(dev);
 			netdev_warn(dev,
@@ -1668,8 +1701,7 @@ static netdev_tx_t m_can_tx_handler(struct m_can_classdev *cdev)
 		}
 
 		/* get put index for frame */
-		putidx = FIELD_GET(TXFQS_TFQPI_MASK,
-				   m_can_read(cdev, M_CAN_TXFQS));
+		putidx = FIELD_GET(TXFQS_TFQPI_MASK, txfqs);
 
 		/* Construct DLC Field, with CAN-FD configuration.
 		 * Use the put index of the fifo as the message marker,
@@ -1809,7 +1841,9 @@ static int m_can_open(struct net_device *dev)
 	}
 
 	/* start the m_can controller */
-	m_can_start(dev);
+	err = m_can_start(dev);
+	if (err)
+		goto exit_irq_fail;
 
 	if (!cdev->is_peripheral)
 		napi_enable(&cdev->napi);
@@ -2068,9 +2102,13 @@ int m_can_class_resume(struct device *dev)
 		ret = m_can_clk_start(cdev);
 		if (ret)
 			return ret;
+		ret  = m_can_start(ndev);
+		if (ret) {
+			m_can_clk_stop(cdev);
+
+			return ret;
+		}
 
-		m_can_init_ram(cdev);
-		m_can_start(ndev);
 		netif_device_attach(ndev);
 		netif_start_queue(ndev);
 	}
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h
index 52563c048732..a839dc71dc9b 100644
--- a/drivers/net/can/m_can/m_can.h
+++ b/drivers/net/can/m_can/m_can.h
@@ -7,27 +7,27 @@
 #define _CAN_M_CAN_H_
 
 #include <linux/can/core.h>
+#include <linux/can/dev.h>
 #include <linux/can/rx-offload.h>
+#include <linux/clk.h>
 #include <linux/completion.h>
+#include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/freezer.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/pm_runtime.h>
-#include <linux/iopoll.h>
-#include <linux/can/dev.h>
-#include <linux/pinctrl/consumer.h>
 #include <linux/phy/phy.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
 
 /* m_can lec values */
 enum m_can_lec_type {
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index eee47bad0592..9c1dcf838006 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -5,8 +5,8 @@
 //
 // Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
 
-#include <linux/platform_device.h>
 #include <linux/phy/phy.h>
+#include <linux/platform_device.h>
 
 #include "m_can.h"
 
@@ -140,10 +140,6 @@ static int m_can_plat_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, mcan_class);
 
-	ret = m_can_init_ram(mcan_class);
-	if (ret)
-		goto probe_fail;
-
 	pm_runtime_enable(mcan_class->dev);
 	ret = m_can_class_register(mcan_class);
 	if (ret)
diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c
index 41645a24384c..2342aa011647 100644
--- a/drivers/net/can/m_can/tcan4x5x-core.c
+++ b/drivers/net/can/m_can/tcan4x5x-core.c
@@ -10,7 +10,7 @@
 #define TCAN4X5X_DEV_ID1 0x04
 #define TCAN4X5X_REV 0x08
 #define TCAN4X5X_STATUS 0x0C
-#define TCAN4X5X_ERROR_STATUS 0x10
+#define TCAN4X5X_ERROR_STATUS_MASK 0x10
 #define TCAN4X5X_CONTROL 0x14
 
 #define TCAN4X5X_CONFIG 0x800
@@ -204,17 +204,7 @@ static int tcan4x5x_clear_interrupts(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;
 
-	ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_MCAN_INT_REG,
-				      TCAN4X5X_ENABLE_MCAN_INT);
-	if (ret)
-		return ret;
-
-	ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_FLAGS,
-				      TCAN4X5X_CLEAR_ALL_INT);
-	if (ret)
-		return ret;
-
-	return tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_ERROR_STATUS,
+	return tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_INT_FLAGS,
 				       TCAN4X5X_CLEAR_ALL_INT);
 }
 
@@ -234,8 +224,8 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
 	if (ret)
 		return ret;
 
-	/* Zero out the MCAN buffers */
-	ret = m_can_init_ram(cdev);
+	ret = tcan4x5x_write_tcan_reg(cdev, TCAN4X5X_ERROR_STATUS_MASK,
+				      TCAN4X5X_CLEAR_ALL_INT);
 	if (ret)
 		return ret;
 
diff --git a/drivers/net/can/m_can/tcan4x5x-regmap.c b/drivers/net/can/m_can/tcan4x5x-regmap.c
index 26e212b8ca7a..2b218ce04e9f 100644
--- a/drivers/net/can/m_can/tcan4x5x-regmap.c
+++ b/drivers/net/can/m_can/tcan4x5x-regmap.c
@@ -90,16 +90,47 @@ static int tcan4x5x_regmap_read(void *context,
 	return 0;
 }
 
-static const struct regmap_range tcan4x5x_reg_table_yes_range[] = {
-	regmap_reg_range(0x0000, 0x002c),	/* Device ID and SPI Registers */
-	regmap_reg_range(0x0800, 0x083c),	/* Device configuration registers and Interrupt Flags*/
+static const struct regmap_range tcan4x5x_reg_table_wr_range[] = {
+	/* Device ID and SPI Registers */
+	regmap_reg_range(0x000c, 0x0010),
+	/* Device configuration registers and Interrupt Flags*/
+	regmap_reg_range(0x0800, 0x080c),
+	regmap_reg_range(0x0814, 0x0814),
+	regmap_reg_range(0x0820, 0x0820),
+	regmap_reg_range(0x0830, 0x0830),
+	/* M_CAN */
+	regmap_reg_range(0x100c, 0x102c),
+	regmap_reg_range(0x1048, 0x1048),
+	regmap_reg_range(0x1050, 0x105c),
+	regmap_reg_range(0x1080, 0x1088),
+	regmap_reg_range(0x1090, 0x1090),
+	regmap_reg_range(0x1098, 0x10a0),
+	regmap_reg_range(0x10a8, 0x10b0),
+	regmap_reg_range(0x10b8, 0x10c0),
+	regmap_reg_range(0x10c8, 0x10c8),
+	regmap_reg_range(0x10d0, 0x10d4),
+	regmap_reg_range(0x10e0, 0x10e4),
+	regmap_reg_range(0x10f0, 0x10f0),
+	regmap_reg_range(0x10f8, 0x10f8),
+	/* MRAM */
+	regmap_reg_range(0x8000, 0x87fc),
+};
+
+static const struct regmap_range tcan4x5x_reg_table_rd_range[] = {
+	regmap_reg_range(0x0000, 0x0010),	/* Device ID and SPI Registers */
+	regmap_reg_range(0x0800, 0x0830),	/* Device configuration registers and Interrupt Flags*/
 	regmap_reg_range(0x1000, 0x10fc),	/* M_CAN */
 	regmap_reg_range(0x8000, 0x87fc),	/* MRAM */
 };
 
-static const struct regmap_access_table tcan4x5x_reg_table = {
-	.yes_ranges = tcan4x5x_reg_table_yes_range,
-	.n_yes_ranges = ARRAY_SIZE(tcan4x5x_reg_table_yes_range),
+static const struct regmap_access_table tcan4x5x_reg_table_wr = {
+	.yes_ranges = tcan4x5x_reg_table_wr_range,
+	.n_yes_ranges = ARRAY_SIZE(tcan4x5x_reg_table_wr_range),
+};
+
+static const struct regmap_access_table tcan4x5x_reg_table_rd = {
+	.yes_ranges = tcan4x5x_reg_table_rd_range,
+	.n_yes_ranges = ARRAY_SIZE(tcan4x5x_reg_table_rd_range),
 };
 
 static const struct regmap_config tcan4x5x_regmap = {
@@ -107,8 +138,8 @@ static const struct regmap_config tcan4x5x_regmap = {
 	.reg_stride = 4,
 	.pad_bits = 8,
 	.val_bits = 32,
-	.wr_table = &tcan4x5x_reg_table,
-	.rd_table = &tcan4x5x_reg_table,
+	.wr_table = &tcan4x5x_reg_table_wr,
+	.rd_table = &tcan4x5x_reg_table_rd,
 	.max_register = TCAN4X5X_MAX_REGISTER,
 	.cache_type = REGCACHE_NONE,
 	.read_flag_mask = (__force unsigned long)
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 0a59eab35da7..f6fa7157b99b 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -41,12 +41,6 @@
 
 #define RCANFD_DRV_NAME			"rcar_canfd"
 
-enum rcanfd_chip_id {
-	RENESAS_RCAR_GEN3 = 0,
-	RENESAS_RZG2L,
-	RENESAS_R8A779A0,
-};
-
 /* Global register bits */
 
 /* RSCFDnCFDGRMCFG */
@@ -522,6 +516,14 @@ enum rcar_canfd_fcanclk {
 
 struct rcar_canfd_global;
 
+struct rcar_canfd_hw_info {
+	u8 max_channels;
+	u8 postdiv;
+	/* hardware features */
+	unsigned shared_global_irqs:1;	/* Has shared global irqs */
+	unsigned multi_channel_irqs:1;	/* Has multiple channel irqs */
+};
+
 /* Channel priv data */
 struct rcar_canfd_channel {
 	struct can_priv can;			/* Must be the first member */
@@ -547,8 +549,7 @@ struct rcar_canfd_global {
 	bool fdmode;			/* CAN FD or Classical CAN only mode */
 	struct reset_control *rstc1;
 	struct reset_control *rstc2;
-	enum rcanfd_chip_id chip_id;
-	u32 max_channels;
+	const struct rcar_canfd_hw_info *info;
 };
 
 /* CAN FD mode nominal rate constants */
@@ -590,10 +591,28 @@ static const struct can_bittiming_const rcar_canfd_bittiming_const = {
 	.brp_inc = 1,
 };
 
+static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
+	.max_channels = 2,
+	.postdiv = 2,
+	.shared_global_irqs = 1,
+};
+
+static const struct rcar_canfd_hw_info rzg2l_hw_info = {
+	.max_channels = 2,
+	.postdiv = 1,
+	.multi_channel_irqs = 1,
+};
+
+static const struct rcar_canfd_hw_info r8a779a0_hw_info = {
+	.max_channels = 8,
+	.postdiv = 2,
+	.shared_global_irqs = 1,
+};
+
 /* Helper functions */
 static inline bool is_v3u(struct rcar_canfd_global *gpriv)
 {
-	return gpriv->chip_id == RENESAS_R8A779A0;
+	return gpriv->info == &r8a779a0_hw_info;
 }
 
 static inline u32 reg_v3u(struct rcar_canfd_global *gpriv,
@@ -721,7 +740,7 @@ static int rcar_canfd_reset_controller(struct rcar_canfd_global *gpriv)
 	rcar_canfd_set_mode(gpriv);
 
 	/* Transition all Channels to reset mode */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
 		rcar_canfd_clear_bit(gpriv->base,
 				     RCANFD_CCTR(ch), RCANFD_CCTR_CSLPR);
 
@@ -762,7 +781,7 @@ static void rcar_canfd_configure_controller(struct rcar_canfd_global *gpriv)
 	rcar_canfd_set_bit(gpriv->base, RCANFD_GCFG, cfg);
 
 	/* Channel configuration settings */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
 		rcar_canfd_set_bit(gpriv->base, RCANFD_CCTR(ch),
 				   RCANFD_CCTR_ERRD);
 		rcar_canfd_update_bit(gpriv->base, RCANFD_CCTR(ch),
@@ -1142,7 +1161,7 @@ static irqreturn_t rcar_canfd_global_err_interrupt(int irq, void *dev_id)
 	struct rcar_canfd_global *gpriv = dev_id;
 	u32 ch;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels)
 		rcar_canfd_handle_global_err(gpriv, ch);
 
 	return IRQ_HANDLED;
@@ -1174,7 +1193,7 @@ static irqreturn_t rcar_canfd_global_receive_fifo_interrupt(int irq, void *dev_i
 	struct rcar_canfd_global *gpriv = dev_id;
 	u32 ch;
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels)
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels)
 		rcar_canfd_handle_global_receive(gpriv, ch);
 
 	return IRQ_HANDLED;
@@ -1188,7 +1207,7 @@ static irqreturn_t rcar_canfd_global_interrupt(int irq, void *dev_id)
 	/* Global error interrupts still indicate a condition specific
 	 * to a channel. RxFIFO interrupt is a global interrupt.
 	 */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
 		rcar_canfd_handle_global_err(gpriv, ch);
 		rcar_canfd_handle_global_receive(gpriv, ch);
 	}
@@ -1284,7 +1303,7 @@ static irqreturn_t rcar_canfd_channel_interrupt(int irq, void *dev_id)
 	u32 ch;
 
 	/* Common FIFO is a per channel resource */
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
 		rcar_canfd_handle_channel_err(gpriv, ch);
 		rcar_canfd_handle_channel_tx(gpriv, ch);
 	}
@@ -1696,6 +1715,7 @@ static const struct ethtool_ops rcar_canfd_ethtool_ops = {
 static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 				    u32 fcan_freq)
 {
+	const struct rcar_canfd_hw_info *info = gpriv->info;
 	struct platform_device *pdev = gpriv->pdev;
 	struct rcar_canfd_channel *priv;
 	struct net_device *ndev;
@@ -1718,7 +1738,7 @@ static int rcar_canfd_channel_probe(struct rcar_canfd_global *gpriv, u32 ch,
 	priv->can.clock.freq = fcan_freq;
 	dev_info(&pdev->dev, "can_clk rate is %u\n", priv->can.clock.freq);
 
-	if (gpriv->chip_id == RENESAS_RZG2L) {
+	if (info->multi_channel_irqs) {
 		char *irq_name;
 		int err_irq;
 		int tx_irq;
@@ -1818,6 +1838,7 @@ static void rcar_canfd_channel_remove(struct rcar_canfd_global *gpriv, u32 ch)
 
 static int rcar_canfd_probe(struct platform_device *pdev)
 {
+	const struct rcar_canfd_hw_info *info;
 	void __iomem *addr;
 	u32 sts, ch, fcan_freq;
 	struct rcar_canfd_global *gpriv;
@@ -1826,18 +1847,15 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	int err, ch_irq, g_irq;
 	int g_err_irq, g_recc_irq;
 	bool fdmode = true;			/* CAN FD only mode - default */
-	enum rcanfd_chip_id chip_id;
-	int max_channels;
 	char name[9] = "channelX";
 	int i;
 
-	chip_id = (uintptr_t)of_device_get_match_data(&pdev->dev);
-	max_channels = chip_id == RENESAS_R8A779A0 ? 8 : 2;
+	info = of_device_get_match_data(&pdev->dev);
 
 	if (of_property_read_bool(pdev->dev.of_node, "renesas,no-can-fd"))
 		fdmode = false;			/* Classical CAN only mode */
 
-	for (i = 0; i < max_channels; ++i) {
+	for (i = 0; i < info->max_channels; ++i) {
 		name[7] = '0' + i;
 		of_child = of_get_child_by_name(pdev->dev.of_node, name);
 		if (of_child && of_device_is_available(of_child))
@@ -1845,7 +1863,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 		of_node_put(of_child);
 	}
 
-	if (chip_id != RENESAS_RZG2L) {
+	if (info->shared_global_irqs) {
 		ch_irq = platform_get_irq_byname_optional(pdev, "ch_int");
 		if (ch_irq < 0) {
 			/* For backward compatibility get irq by index */
@@ -1879,8 +1897,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	gpriv->pdev = pdev;
 	gpriv->channels_mask = channels_mask;
 	gpriv->fdmode = fdmode;
-	gpriv->chip_id = chip_id;
-	gpriv->max_channels = max_channels;
+	gpriv->info = info;
 
 	gpriv->rstc1 = devm_reset_control_get_optional_exclusive(&pdev->dev,
 								 "rstp_n");
@@ -1917,9 +1934,9 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	}
 	fcan_freq = clk_get_rate(gpriv->can_clk);
 
-	if (gpriv->fcan == RCANFD_CANFDCLK && gpriv->chip_id != RENESAS_RZG2L)
+	if (gpriv->fcan == RCANFD_CANFDCLK)
 		/* CANFD clock is further divided by (1/2) within the IP */
-		fcan_freq /= 2;
+		fcan_freq /= info->postdiv;
 
 	addr = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(addr)) {
@@ -1929,7 +1946,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	gpriv->base = addr;
 
 	/* Request IRQ that's common for both channels */
-	if (gpriv->chip_id != RENESAS_RZG2L) {
+	if (info->shared_global_irqs) {
 		err = devm_request_irq(&pdev->dev, ch_irq,
 				       rcar_canfd_channel_interrupt, 0,
 				       "canfd.ch_int", gpriv);
@@ -1995,7 +2012,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	rcar_canfd_configure_controller(gpriv);
 
 	/* Configure per channel attributes */
-	for_each_set_bit(ch, &gpriv->channels_mask, max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels) {
 		/* Configure Channel's Rx fifo */
 		rcar_canfd_configure_rx(gpriv, ch);
 
@@ -2021,7 +2038,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 		goto fail_mode;
 	}
 
-	for_each_set_bit(ch, &gpriv->channels_mask, max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels) {
 		err = rcar_canfd_channel_probe(gpriv, ch, fcan_freq);
 		if (err)
 			goto fail_channel;
@@ -2033,7 +2050,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
 	return 0;
 
 fail_channel:
-	for_each_set_bit(ch, &gpriv->channels_mask, max_channels)
+	for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels)
 		rcar_canfd_channel_remove(gpriv, ch);
 fail_mode:
 	rcar_canfd_disable_global_interrupts(gpriv);
@@ -2054,7 +2071,7 @@ static int rcar_canfd_remove(struct platform_device *pdev)
 	rcar_canfd_reset_controller(gpriv);
 	rcar_canfd_disable_global_interrupts(gpriv);
 
-	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->max_channels) {
+	for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
 		rcar_canfd_disable_channel_interrupts(gpriv->ch[ch]);
 		rcar_canfd_channel_remove(gpriv, ch);
 	}
@@ -2082,9 +2099,9 @@ static SIMPLE_DEV_PM_OPS(rcar_canfd_pm_ops, rcar_canfd_suspend,
 			 rcar_canfd_resume);
 
 static const __maybe_unused struct of_device_id rcar_canfd_of_table[] = {
-	{ .compatible = "renesas,rcar-gen3-canfd", .data = (void *)RENESAS_RCAR_GEN3 },
-	{ .compatible = "renesas,rzg2l-canfd", .data = (void *)RENESAS_RZG2L },
-	{ .compatible = "renesas,r8a779a0-canfd", .data = (void *)RENESAS_R8A779A0 },
+	{ .compatible = "renesas,rcar-gen3-canfd", .data = &rcar_gen3_hw_info },
+	{ .compatible = "renesas,rzg2l-canfd", .data = &rzg2l_hw_info },
+	{ .compatible = "renesas,r8a779a0-canfd", .data = &r8a779a0_hw_info },
 	{ }
 };
 
diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig
index 8c6fea661530..445504ababce 100644
--- a/drivers/net/can/usb/Kconfig
+++ b/drivers/net/can/usb/Kconfig
@@ -30,6 +30,7 @@ config CAN_ESD_USB
 config CAN_ETAS_ES58X
 	tristate "ETAS ES58X CAN/USB interfaces"
 	select CRC16
+	select NET_DEVLINK
 	help
 	  This driver supports the ES581.4, ES582.1 and ES584.1 interfaces
 	  from ETAS GmbH (https://www.etas.com/en/products/es58x.php).
diff --git a/drivers/net/can/usb/etas_es58x/Makefile b/drivers/net/can/usb/etas_es58x/Makefile
index a129b4aa0215..d6667ebe259f 100644
--- a/drivers/net/can/usb/etas_es58x/Makefile
+++ b/drivers/net/can/usb/etas_es58x/Makefile
@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_CAN_ETAS_ES58X) += etas_es58x.o
-etas_es58x-y = es58x_core.o es581_4.o es58x_fd.o
+etas_es58x-y = es58x_core.o es58x_devlink.o es581_4.o es58x_fd.o
diff --git a/drivers/net/can/usb/etas_es58x/es581_4.c b/drivers/net/can/usb/etas_es58x/es581_4.c
index 1bcdcece5ec7..4151b18fd045 100644
--- a/drivers/net/can/usb/etas_es58x/es581_4.c
+++ b/drivers/net/can/usb/etas_es58x/es581_4.c
@@ -6,12 +6,12 @@
  *
  * Copyright (c) 2019 Robert Bosch Engineering and Business Solutions. All rights reserved.
  * Copyright (c) 2020 ETAS K.K.. All rights reserved.
- * Copyright (c) 2020, 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
+ * Copyright (c) 2020-2022 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
  */
 
+#include <asm/unaligned.h>
 #include <linux/kernel.h>
 #include <linux/units.h>
-#include <asm/unaligned.h>
 
 #include "es58x_core.h"
 #include "es581_4.h"
diff --git a/drivers/net/can/usb/etas_es58x/es58x_core.c b/drivers/net/can/usb/etas_es58x/es58x_core.c
index ddb7c5735c9a..0c7f7505632c 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_core.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.c
@@ -7,15 +7,16 @@
  *
  * Copyright (c) 2019 Robert Bosch Engineering and Business Solutions. All rights reserved.
  * Copyright (c) 2020 ETAS K.K.. All rights reserved.
- * Copyright (c) 2020, 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
+ * Copyright (c) 2020-2022 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
  */
 
+#include <asm/unaligned.h>
+#include <linux/crc16.h>
 #include <linux/ethtool.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/usb.h>
-#include <linux/crc16.h>
-#include <asm/unaligned.h>
+#include <net/devlink.h>
 
 #include "es58x_core.h"
 
@@ -2038,10 +2039,16 @@ static int es58x_set_mode(struct net_device *netdev, enum can_mode mode)
  * @es58x_dev: ES58X device.
  * @priv: ES58X private parameters related to the network device.
  * @channel_idx: Index of the network device.
+ *
+ * Return: zero on success, errno if devlink port could not be
+ *	properly registered.
  */
-static void es58x_init_priv(struct es58x_device *es58x_dev,
-			    struct es58x_priv *priv, int channel_idx)
+static int es58x_init_priv(struct es58x_device *es58x_dev,
+			   struct es58x_priv *priv, int channel_idx)
 {
+	struct devlink_port_attrs attrs = {
+		.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL,
+	};
 	const struct es58x_parameters *param = es58x_dev->param;
 	struct can_priv *can = &priv->can;
 
@@ -2060,6 +2067,10 @@ static void es58x_init_priv(struct es58x_device *es58x_dev,
 	can->state = CAN_STATE_STOPPED;
 	can->ctrlmode_supported = param->ctrlmode_supported;
 	can->do_set_mode = es58x_set_mode;
+
+	devlink_port_attrs_set(&priv->devlink_port, &attrs);
+	return devlink_port_register(priv_to_devlink(es58x_dev),
+				     &priv->devlink_port, channel_idx);
 }
 
 /**
@@ -2083,7 +2094,10 @@ static int es58x_init_netdev(struct es58x_device *es58x_dev, int channel_idx)
 	}
 	SET_NETDEV_DEV(netdev, dev);
 	es58x_dev->netdev[channel_idx] = netdev;
-	es58x_init_priv(es58x_dev, es58x_priv(netdev), channel_idx);
+	ret = es58x_init_priv(es58x_dev, es58x_priv(netdev), channel_idx);
+	if (ret)
+		goto free_candev;
+	SET_NETDEV_DEVLINK_PORT(netdev, &es58x_priv(netdev)->devlink_port);
 
 	netdev->netdev_ops = &es58x_netdev_ops;
 	netdev->ethtool_ops = &es58x_ethtool_ops;
@@ -2091,16 +2105,20 @@ static int es58x_init_netdev(struct es58x_device *es58x_dev, int channel_idx)
 	netdev->dev_port = channel_idx;
 
 	ret = register_candev(netdev);
-	if (ret) {
-		es58x_dev->netdev[channel_idx] = NULL;
-		free_candev(netdev);
-		return ret;
-	}
+	if (ret)
+		goto devlink_port_unregister;
 
 	netdev_queue_set_dql_min_limit(netdev_get_tx_queue(netdev, 0),
 				       es58x_dev->param->dql_min_limit);
 
 	return ret;
+
+ devlink_port_unregister:
+	devlink_port_unregister(&es58x_priv(netdev)->devlink_port);
+ free_candev:
+	es58x_dev->netdev[channel_idx] = NULL;
+	free_candev(netdev);
+	return ret;
 }
 
 /**
@@ -2117,54 +2135,13 @@ static void es58x_free_netdevs(struct es58x_device *es58x_dev)
 		if (!netdev)
 			continue;
 		unregister_candev(netdev);
+		devlink_port_unregister(&es58x_priv(netdev)->devlink_port);
 		es58x_dev->netdev[i] = NULL;
 		free_candev(netdev);
 	}
 }
 
 /**
- * es58x_get_product_info() - Get the product information and print them.
- * @es58x_dev: ES58X device.
- *
- * Do a synchronous call to get the product information.
- *
- * Return: zero on success, errno when any error occurs.
- */
-static int es58x_get_product_info(struct es58x_device *es58x_dev)
-{
-	struct usb_device *udev = es58x_dev->udev;
-	const int es58x_prod_info_idx = 6;
-	/* Empirical tests show a prod_info length of maximum 83,
-	 * below should be more than enough.
-	 */
-	const size_t prod_info_len = 127;
-	char *prod_info;
-	int ret;
-
-	prod_info = kmalloc(prod_info_len, GFP_KERNEL);
-	if (!prod_info)
-		return -ENOMEM;
-
-	ret = usb_string(udev, es58x_prod_info_idx, prod_info, prod_info_len);
-	if (ret < 0) {
-		dev_err(es58x_dev->dev,
-			"%s: Could not read the product info: %pe\n",
-			__func__, ERR_PTR(ret));
-		goto out_free;
-	}
-	if (ret >= prod_info_len - 1) {
-		dev_warn(es58x_dev->dev,
-			 "%s: Buffer is too small, result might be truncated\n",
-			 __func__);
-	}
-	dev_info(es58x_dev->dev, "Product info: %s\n", prod_info);
-
- out_free:
-	kfree(prod_info);
-	return ret < 0 ? ret : 0;
-}
-
-/**
  * es58x_init_es58x_dev() - Initialize the ES58X device.
  * @intf: USB interface.
  * @driver_info: Quirks of the device.
@@ -2177,6 +2154,7 @@ static struct es58x_device *es58x_init_es58x_dev(struct usb_interface *intf,
 {
 	struct device *dev = &intf->dev;
 	struct es58x_device *es58x_dev;
+	struct devlink *devlink;
 	const struct es58x_parameters *param;
 	const struct es58x_operators *ops;
 	struct usb_device *udev = interface_to_usbdev(intf);
@@ -2199,11 +2177,12 @@ static struct es58x_device *es58x_init_es58x_dev(struct usb_interface *intf,
 		ops = &es581_4_ops;
 	}
 
-	es58x_dev = devm_kzalloc(dev, es58x_sizeof_es58x_device(param),
-				 GFP_KERNEL);
-	if (!es58x_dev)
+	devlink = devlink_alloc(&es58x_dl_ops, es58x_sizeof_es58x_device(param),
+				dev);
+	if (!devlink)
 		return ERR_PTR(-ENOMEM);
 
+	es58x_dev = devlink_priv(devlink);
 	es58x_dev->param = param;
 	es58x_dev->ops = ops;
 	es58x_dev->dev = dev;
@@ -2240,25 +2219,24 @@ static int es58x_probe(struct usb_interface *intf,
 		       const struct usb_device_id *id)
 {
 	struct es58x_device *es58x_dev;
-	int ch_idx, ret;
+	int ch_idx;
 
 	es58x_dev = es58x_init_es58x_dev(intf, id->driver_info);
 	if (IS_ERR(es58x_dev))
 		return PTR_ERR(es58x_dev);
 
-	ret = es58x_get_product_info(es58x_dev);
-	if (ret)
-		return ret;
+	es58x_parse_product_info(es58x_dev);
+	devlink_register(priv_to_devlink(es58x_dev));
 
 	for (ch_idx = 0; ch_idx < es58x_dev->num_can_ch; ch_idx++) {
-		ret = es58x_init_netdev(es58x_dev, ch_idx);
+		int ret = es58x_init_netdev(es58x_dev, ch_idx);
 		if (ret) {
 			es58x_free_netdevs(es58x_dev);
 			return ret;
 		}
 	}
 
-	return ret;
+	return 0;
 }
 
 /**
@@ -2275,8 +2253,10 @@ static void es58x_disconnect(struct usb_interface *intf)
 	dev_info(&intf->dev, "Disconnecting %s %s\n",
 		 es58x_dev->udev->manufacturer, es58x_dev->udev->product);
 
+	devlink_unregister(priv_to_devlink(es58x_dev));
 	es58x_free_netdevs(es58x_dev);
 	es58x_free_urbs(es58x_dev);
+	devlink_free(priv_to_devlink(es58x_dev));
 	usb_set_intfdata(intf, NULL);
 }
 
diff --git a/drivers/net/can/usb/etas_es58x/es58x_core.h b/drivers/net/can/usb/etas_es58x/es58x_core.h
index 640fe0a1df63..c1ba1a4e8857 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_core.h
+++ b/drivers/net/can/usb/etas_es58x/es58x_core.h
@@ -6,17 +6,18 @@
  *
  * Copyright (c) 2019 Robert Bosch Engineering and Business Solutions. All rights reserved.
  * Copyright (c) 2020 ETAS K.K.. All rights reserved.
- * Copyright (c) 2020, 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
+ * Copyright (c) 2020-2022 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
  */
 
 #ifndef __ES58X_COMMON_H__
 #define __ES58X_COMMON_H__
 
-#include <linux/types.h>
-#include <linux/usb.h>
-#include <linux/netdevice.h>
 #include <linux/can.h>
 #include <linux/can/dev.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/usb.h>
+#include <net/devlink.h>
 
 #include "es581_4.h"
 #include "es58x_fd.h"
@@ -230,6 +231,7 @@ union es58x_urb_cmd {
  * @can: struct can_priv must be the first member (Socket CAN relies
  *	on the fact that function netdev_priv() returns a pointer to
  *	a struct can_priv).
+ * @devlink_port: devlink instance for the network interface.
  * @es58x_dev: pointer to the corresponding ES58X device.
  * @tx_urb: Used as a buffer to concatenate the TX messages and to do
  *	a bulk send. Please refer to es58x_start_xmit() for more
@@ -255,6 +257,7 @@ union es58x_urb_cmd {
  */
 struct es58x_priv {
 	struct can_priv can;
+	struct devlink_port devlink_port;
 	struct es58x_device *es58x_dev;
 	struct urb *tx_urb;
 
@@ -357,6 +360,39 @@ struct es58x_operators {
 };
 
 /**
+ * struct es58x_sw_version - Version number of the firmware or the
+ *	bootloader.
+ * @major: Version major number, represented on two digits.
+ * @minor: Version minor number, represented on two digits.
+ * @revision: Version revision number, represented on two digits.
+ *
+ * The firmware and the bootloader share the same format: "xx.xx.xx"
+ * where 'x' is a digit. Both can be retrieved from the product
+ * information string.
+ */
+struct es58x_sw_version {
+	u8 major;
+	u8 minor;
+	u8 revision;
+};
+
+/**
+ * struct es58x_hw_revision - Hardware revision number.
+ * @letter: Revision letter.
+ * @major: Version major number, represented on three digits.
+ * @minor: Version minor number, represented on three digits.
+ *
+ * The hardware revision uses its own format: "axxx/xxx" where 'a' is
+ * a letter and 'x' a digit. It can be retrieved from the product
+ * information string.
+ */
+struct es58x_hw_revision {
+	char letter;
+	u16 major;
+	u16 minor;
+};
+
+/**
  * struct es58x_device - All information specific to an ES58X device.
  * @dev: Device information.
  * @udev: USB device information.
@@ -373,6 +409,9 @@ struct es58x_operators {
  *	queue wake/stop logic should prevent this URB from getting
  *	empty. Please refer to es58x_get_tx_urb() for more details.
  * @tx_urbs_idle_cnt: number of urbs in @tx_urbs_idle.
+ * @firmware_version: The firmware version number.
+ * @bootloader_version: The bootloader version number.
+ * @hardware_revision: The hardware revision number.
  * @ktime_req_ns: kernel timestamp when es58x_set_realtime_diff_ns()
  *	was called.
  * @realtime_diff_ns: difference in nanoseconds between the clocks of
@@ -408,6 +447,10 @@ struct es58x_device {
 	struct usb_anchor tx_urbs_idle;
 	atomic_t tx_urbs_idle_cnt;
 
+	struct es58x_sw_version firmware_version;
+	struct es58x_sw_version bootloader_version;
+	struct es58x_hw_revision hardware_revision;
+
 	u64 ktime_req_ns;
 	s64 realtime_diff_ns;
 
@@ -674,6 +717,7 @@ static inline enum es58x_flag es58x_get_flags(const struct sk_buff *skb)
 	return es58x_flags;
 }
 
+/* es58x_core.c. */
 int es58x_can_get_echo_skb(struct net_device *netdev, u32 packet_idx,
 			   u64 *tstamps, unsigned int pkts);
 int es58x_tx_ack_msg(struct net_device *netdev, u16 tx_free_entries,
@@ -691,9 +735,15 @@ int es58x_rx_cmd_ret_u32(struct net_device *netdev,
 int es58x_send_msg(struct es58x_device *es58x_dev, u8 cmd_type, u8 cmd_id,
 		   const void *msg, u16 cmd_len, int channel_idx);
 
+/* es58x_devlink.c. */
+void es58x_parse_product_info(struct es58x_device *es58x_dev);
+extern const struct devlink_ops es58x_dl_ops;
+
+/* es581_4.c. */
 extern const struct es58x_parameters es581_4_param;
 extern const struct es58x_operators es581_4_ops;
 
+/* es58x_fd.c. */
 extern const struct es58x_parameters es58x_fd_param;
 extern const struct es58x_operators es58x_fd_ops;
 
diff --git a/drivers/net/can/usb/etas_es58x/es58x_devlink.c b/drivers/net/can/usb/etas_es58x/es58x_devlink.c
new file mode 100644
index 000000000000..9fba29e2f57c
--- /dev/null
+++ b/drivers/net/can/usb/etas_es58x/es58x_devlink.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Driver for ETAS GmbH ES58X USB CAN(-FD) Bus Interfaces.
+ *
+ * File es58x_devlink.c: report the product information using devlink.
+ *
+ * Copyright (c) 2022 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
+ */
+
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/usb.h>
+#include <net/devlink.h>
+
+#include "es58x_core.h"
+
+/* USB descriptor index containing the product information string. */
+#define ES58X_PROD_INFO_IDX 6
+
+/**
+ * es58x_parse_sw_version() - Extract boot loader or firmware version.
+ * @es58x_dev: ES58X device.
+ * @prod_info: USB custom string returned by the device.
+ * @prefix: Select which information should be parsed. Set it to "FW"
+ *	to parse the firmware version or to "BL" to parse the
+ *	bootloader version.
+ *
+ * The @prod_info string contains the firmware and the bootloader
+ * version number all prefixed by a magic string and concatenated with
+ * other numbers. Depending on the device, the firmware (bootloader)
+ * format is either "FW_Vxx.xx.xx" ("BL_Vxx.xx.xx") or "FW:xx.xx.xx"
+ * ("BL:xx.xx.xx") where 'x' represents a digit. @prod_info must
+ * contains the common part of those prefixes: "FW" or "BL".
+ *
+ * Parse @prod_info and store the version number in
+ * &es58x_dev.firmware_version or &es58x_dev.bootloader_version
+ * according to @prefix value.
+ *
+ * Return: zero on success, -EINVAL if @prefix contains an invalid
+ *	value and -EBADMSG if @prod_info could not be parsed.
+ */
+static int es58x_parse_sw_version(struct es58x_device *es58x_dev,
+				  const char *prod_info, const char *prefix)
+{
+	struct es58x_sw_version *version;
+	int major, minor, revision;
+
+	if (!strcmp(prefix, "FW"))
+		version = &es58x_dev->firmware_version;
+	else if (!strcmp(prefix, "BL"))
+		version = &es58x_dev->bootloader_version;
+	else
+		return -EINVAL;
+
+	/* Go to prefix */
+	prod_info = strstr(prod_info, prefix);
+	if (!prod_info)
+		return -EBADMSG;
+	/* Go to beginning of the version number */
+	while (!isdigit(*prod_info)) {
+		prod_info++;
+		if (!*prod_info)
+			return -EBADMSG;
+	}
+
+	if (sscanf(prod_info, "%2u.%2u.%2u", &major, &minor, &revision) != 3)
+		return -EBADMSG;
+
+	version->major = major;
+	version->minor = minor;
+	version->revision = revision;
+
+	return 0;
+}
+
+/**
+ * es58x_parse_hw_rev() - Extract hardware revision number.
+ * @es58x_dev: ES58X device.
+ * @prod_info: USB custom string returned by the device.
+ *
+ * @prod_info contains the hardware revision prefixed by a magic
+ * string and conquenated together with other numbers. Depending on
+ * the device, the hardware revision format is either
+ * "HW_VER:axxx/xxx" or "HR:axxx/xxx" where 'a' represents a letter
+ * and 'x' a digit.
+ *
+ * Parse @prod_info and store the hardware revision number in
+ * &es58x_dev.hardware_revision.
+ *
+ * Return: zero on success, -EBADMSG if @prod_info could not be
+ *	parsed.
+ */
+static int es58x_parse_hw_rev(struct es58x_device *es58x_dev,
+			      const char *prod_info)
+{
+	char letter;
+	int major, minor;
+
+	/* The only occurrence of 'H' is in the hardware revision prefix. */
+	prod_info = strchr(prod_info, 'H');
+	if (!prod_info)
+		return -EBADMSG;
+	/* Go to beginning of the hardware revision */
+	prod_info = strchr(prod_info, ':');
+	if (!prod_info)
+		return -EBADMSG;
+	prod_info++;
+
+	if (sscanf(prod_info, "%c%3u/%3u", &letter, &major, &minor) != 3)
+		return -EBADMSG;
+
+	es58x_dev->hardware_revision.letter = letter;
+	es58x_dev->hardware_revision.major = major;
+	es58x_dev->hardware_revision.minor = minor;
+
+	return 0;
+}
+
+/**
+ * es58x_parse_product_info() - Parse the ES58x product information
+ *	string.
+ * @es58x_dev: ES58X device.
+ *
+ * Retrieve the product information string and parse it to extract the
+ * firmware version, the bootloader version and the hardware
+ * revision.
+ *
+ * If the function fails, simply emit a log message and continue
+ * because product information is not critical for the driver to
+ * operate.
+ */
+void es58x_parse_product_info(struct es58x_device *es58x_dev)
+{
+	char *prod_info;
+
+	prod_info = usb_cache_string(es58x_dev->udev, ES58X_PROD_INFO_IDX);
+	if (!prod_info) {
+		dev_warn(es58x_dev->dev,
+			 "could not retrieve the product info string\n");
+		return;
+	}
+
+	if (es58x_parse_sw_version(es58x_dev, prod_info, "FW") ||
+	    es58x_parse_sw_version(es58x_dev, prod_info, "BL") ||
+	    es58x_parse_hw_rev(es58x_dev, prod_info))
+		dev_info(es58x_dev->dev,
+			 "could not parse product info: '%s'\n", prod_info);
+
+	kfree(prod_info);
+}
+
+/**
+ * es58x_sw_version_is_set() - Check if the version is a valid number.
+ * @sw_ver: Version number of either the firmware or the bootloader.
+ *
+ * If &es58x_sw_version.major, &es58x_sw_version.minor and
+ * &es58x_sw_version.revision are all zero, the product string could
+ * not be parsed and the version number is invalid.
+ */
+static inline bool es58x_sw_version_is_set(struct es58x_sw_version *sw_ver)
+{
+	return sw_ver->major || sw_ver->minor || sw_ver->revision;
+}
+
+/**
+ * es58x_hw_revision_is_set() - Check if the revision is a valid number.
+ * @hw_rev: Revision number of the hardware.
+ *
+ * If &es58x_hw_revision.letter is the null character, the product
+ * string could not be parsed and the hardware revision number is
+ * invalid.
+ */
+static inline bool es58x_hw_revision_is_set(struct es58x_hw_revision *hw_rev)
+{
+	return hw_rev->letter != '\0';
+}
+
+/**
+ * es58x_devlink_info_get() - Report the product information.
+ * @devlink: Devlink.
+ * @req: skb wrapper where to put requested information.
+ * @extack: Unused.
+ *
+ * Report the firmware version, the bootloader version, the hardware
+ * revision and the serial number through netlink.
+ *
+ * Return: zero on success, errno when any error occurs.
+ */
+static int es58x_devlink_info_get(struct devlink *devlink,
+				  struct devlink_info_req *req,
+				  struct netlink_ext_ack *extack)
+{
+	struct es58x_device *es58x_dev = devlink_priv(devlink);
+	struct es58x_sw_version *fw_ver = &es58x_dev->firmware_version;
+	struct es58x_sw_version *bl_ver = &es58x_dev->bootloader_version;
+	struct es58x_hw_revision *hw_rev = &es58x_dev->hardware_revision;
+	char buf[max(sizeof("xx.xx.xx"), sizeof("axxx/xxx"))];
+	int ret = 0;
+
+	if (es58x_sw_version_is_set(fw_ver)) {
+		snprintf(buf, sizeof(buf), "%02u.%02u.%02u",
+			 fw_ver->major, fw_ver->minor, fw_ver->revision);
+		ret = devlink_info_version_running_put(req,
+						       DEVLINK_INFO_VERSION_GENERIC_FW,
+						       buf);
+		if (ret)
+			return ret;
+	}
+
+	if (es58x_sw_version_is_set(bl_ver)) {
+		snprintf(buf, sizeof(buf), "%02u.%02u.%02u",
+			 bl_ver->major, bl_ver->minor, bl_ver->revision);
+		ret = devlink_info_version_running_put(req,
+						       DEVLINK_INFO_VERSION_GENERIC_FW_BOOTLOADER,
+						       buf);
+		if (ret)
+			return ret;
+	}
+
+	if (es58x_hw_revision_is_set(hw_rev)) {
+		snprintf(buf, sizeof(buf), "%c%03u/%03u",
+			 hw_rev->letter, hw_rev->major, hw_rev->minor);
+		ret = devlink_info_version_fixed_put(req,
+						     DEVLINK_INFO_VERSION_GENERIC_BOARD_REV,
+						     buf);
+		if (ret)
+			return ret;
+	}
+
+	return devlink_info_serial_number_put(req, es58x_dev->udev->serial);
+}
+
+const struct devlink_ops es58x_dl_ops = {
+	.info_get = es58x_devlink_info_get,
+};
diff --git a/drivers/net/can/usb/etas_es58x/es58x_fd.c b/drivers/net/can/usb/etas_es58x/es58x_fd.c
index c97ffa71fd75..fa87b0b78e3e 100644
--- a/drivers/net/can/usb/etas_es58x/es58x_fd.c
+++ b/drivers/net/can/usb/etas_es58x/es58x_fd.c
@@ -8,12 +8,12 @@
  *
  * Copyright (c) 2019 Robert Bosch Engineering and Business Solutions. All rights reserved.
  * Copyright (c) 2020 ETAS K.K.. All rights reserved.
- * Copyright (c) 2020, 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
+ * Copyright (c) 2020-2022 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
  */
 
+#include <asm/unaligned.h>
 #include <linux/kernel.h>
 #include <linux/units.h>
-#include <asm/unaligned.h>
 
 #include "es58x_core.h"
 #include "es58x_fd.h"
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c
index 838744d2ce34..d476c2884008 100644
--- a/drivers/net/can/usb/gs_usb.c
+++ b/drivers/net/can/usb/gs_usb.c
@@ -299,7 +299,6 @@ struct gs_can {
 
 	struct net_device *netdev;
 	struct usb_device *udev;
-	struct usb_interface *iface;
 
 	struct can_bittiming_const bt_const, data_bt_const;
 	unsigned int channel;	/* channel number */
@@ -383,8 +382,7 @@ static int gs_cmd_reset(struct gs_can *dev)
 		.mode = GS_CAN_MODE_RESET,
 	};
 
-	return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
-				    GS_USB_BREQ_MODE,
+	return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_MODE,
 				    USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				    dev->channel, 0, &dm, sizeof(dm), 1000,
 				    GFP_KERNEL);
@@ -396,8 +394,7 @@ static inline int gs_usb_get_timestamp(const struct gs_can *dev,
 	__le32 timestamp;
 	int rc;
 
-	rc = usb_control_msg_recv(interface_to_usbdev(dev->iface), 0,
-				  GS_USB_BREQ_TIMESTAMP,
+	rc = usb_control_msg_recv(dev->udev, 0, GS_USB_BREQ_TIMESTAMP,
 				  USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				  dev->channel, 0,
 				  &timestamp, sizeof(timestamp),
@@ -674,8 +671,7 @@ static int gs_usb_set_bittiming(struct net_device *netdev)
 	};
 
 	/* request bit timings */
-	return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
-				    GS_USB_BREQ_BITTIMING,
+	return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_BITTIMING,
 				    USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				    dev->channel, 0, &dbt, sizeof(dbt), 1000,
 				    GFP_KERNEL);
@@ -698,8 +694,7 @@ static int gs_usb_set_data_bittiming(struct net_device *netdev)
 		request = GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING;
 
 	/* request data bit timings */
-	return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
-				    request,
+	return usb_control_msg_send(dev->udev, 0, request,
 				    USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				    dev->channel, 0, &dbt, sizeof(dbt), 1000,
 				    GFP_KERNEL);
@@ -941,8 +936,7 @@ static int gs_can_open(struct net_device *netdev)
 	/* finally start device */
 	dev->can.state = CAN_STATE_ERROR_ACTIVE;
 	dm.flags = cpu_to_le32(flags);
-	rc = usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
-				  GS_USB_BREQ_MODE,
+	rc = usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_MODE,
 				  USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				  dev->channel, 0, &dm, sizeof(dm), 1000,
 				  GFP_KERNEL);
@@ -969,8 +963,7 @@ static int gs_usb_get_state(const struct net_device *netdev,
 	struct gs_device_state ds;
 	int rc;
 
-	rc = usb_control_msg_recv(interface_to_usbdev(dev->iface), 0,
-				  GS_USB_BREQ_GET_STATE,
+	rc = usb_control_msg_recv(dev->udev, 0, GS_USB_BREQ_GET_STATE,
 				  USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				  dev->channel, 0,
 				  &ds, sizeof(ds),
@@ -1064,8 +1057,7 @@ static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
 	else
 		imode.mode = cpu_to_le32(GS_CAN_IDENTIFY_OFF);
 
-	return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
-				    GS_USB_BREQ_IDENTIFY,
+	return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_IDENTIFY,
 				    USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				    dev->channel, 0, &imode, sizeof(imode), 100,
 				    GFP_KERNEL);
@@ -1118,8 +1110,7 @@ static int gs_usb_get_termination(struct net_device *netdev, u16 *term)
 	struct gs_device_termination_state term_state;
 	int rc;
 
-	rc = usb_control_msg_recv(interface_to_usbdev(dev->iface), 0,
-				  GS_USB_BREQ_GET_TERMINATION,
+	rc = usb_control_msg_recv(dev->udev, 0, GS_USB_BREQ_GET_TERMINATION,
 				  USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				  dev->channel, 0,
 				  &term_state, sizeof(term_state), 1000,
@@ -1145,8 +1136,7 @@ static int gs_usb_set_termination(struct net_device *netdev, u16 term)
 	else
 		term_state.state = cpu_to_le32(GS_CAN_TERMINATION_STATE_OFF);
 
-	return usb_control_msg_send(interface_to_usbdev(dev->iface), 0,
-				    GS_USB_BREQ_SET_TERMINATION,
+	return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_SET_TERMINATION,
 				    USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 				    dev->channel, 0,
 				    &term_state, sizeof(term_state), 1000,
@@ -1210,7 +1200,6 @@ static struct gs_can *gs_make_candev(unsigned int channel,
 	dev->bt_const.brp_inc = le32_to_cpu(bt_const.brp_inc);
 
 	dev->udev = interface_to_usbdev(intf);
-	dev->iface = intf;
 	dev->netdev = netdev;
 	dev->channel = channel;
 
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
index 3a2bfaad1406..d4c5356d5884 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c
@@ -536,12 +536,11 @@ static int kvaser_usb_set_bittiming(struct net_device *netdev)
 	struct kvaser_usb *dev = priv->dev;
 	const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 	struct can_bittiming *bt = &priv->can.bittiming;
-
 	struct kvaser_usb_busparams busparams;
 	int tseg1 = bt->prop_seg + bt->phase_seg1;
 	int tseg2 = bt->phase_seg2;
 	int sjw = bt->sjw;
-	int err = -EOPNOTSUPP;
+	int err;
 
 	busparams.bitrate = cpu_to_le32(bt->bitrate);
 	busparams.sjw = (u8)sjw;
@@ -581,7 +580,6 @@ static int kvaser_usb_set_data_bittiming(struct net_device *netdev)
 	struct kvaser_usb *dev = priv->dev;
 	const struct kvaser_usb_dev_ops *ops = dev->driver_info->ops;
 	struct can_bittiming *dbt = &priv->can.data_bittiming;
-
 	struct kvaser_usb_busparams busparams;
 	int tseg1 = dbt->prop_seg + dbt->phase_seg1;
 	int tseg2 = dbt->phase_seg2;
diff --git a/drivers/net/can/usb/ucan.c b/drivers/net/can/usb/ucan.c
index ffa38f533c35..a0f7bcec719c 100644
--- a/drivers/net/can/usb/ucan.c
+++ b/drivers/net/can/usb/ucan.c
@@ -277,7 +277,6 @@ struct ucan_priv {
 
 	/* linux USB device structures */
 	struct usb_device *udev;
-	struct usb_interface *intf;
 	struct net_device *netdev;
 
 	/* lock for can->echo_skb (used around
@@ -1501,7 +1500,6 @@ static int ucan_probe(struct usb_interface *intf,
 
 	/* initialize data */
 	up->udev = udev;
-	up->intf = intf;
 	up->netdev = netdev;
 	up->intf_index = iface_desc->desc.bInterfaceNumber;
 	up->in_ep_addr = in_ep_addr;
@@ -1534,9 +1532,8 @@ static int ucan_probe(struct usb_interface *intf,
 				     sizeof(union ucan_ctl_payload));
 	if (ret > 0) {
 		/* copy string while ensuring zero termination */
-		strncpy(firmware_str, up->ctl_msg_buffer->raw,
-			sizeof(union ucan_ctl_payload));
-		firmware_str[sizeof(union ucan_ctl_payload)] = '\0';
+		strscpy(firmware_str, up->ctl_msg_buffer->raw,
+			sizeof(union ucan_ctl_payload) + 1);
 	} else {
 		strcpy(firmware_str, "unknown");
 	}