Merge tag 'linux-can-next-for-5.4-20190820' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2019-08-20

this is a pull request for net-next/master consisting of 18 patches.

The first patch is by Geert Uytterhoeven, it removes the unused platform
data support from the rcar_can driver.

A patch by Nishka Dasgupta marks the structure peak_pciec_i2c_bit_ops in
the peak_pci driver as constant.

A patch by me removes the custom DMA support from the hi311x driver.

The next 4 patches target the tcan4x5x driver and are also by me, they
first clean up the driver a bit, and then add missing error handling and
fix a bug in the length calculation in the regmap callbacks.

The next 2 patches are by me for the m_can_platform driver, they also
remove unneeded casts and add missing error handling.

The remaining 9 patches all target the mcp251x driver. The first 5 are
clean up patches by me, the next relaxes the timing in the
mcp251x_hw_reset() function. Alexander Shiyan's patch improves the name
which is used while registering the interrupt handler. Phil Elwell's
patch improves the mcp251x_open() function to use the DT-supplied
interrupt flags instead of hard coding them. The final patch is again by
me, it removes the custom DMA support from the hi311x driver.
====================

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

7 files changed, 83 insertions, 182 deletions

diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index c2989e0431f2..6ac4c35f247a 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -16,24 +16,21 @@ struct m_can_plat_priv {
 
 static u32 iomap_read_reg(struct m_can_classdev *cdev, int reg)
 {
-	struct m_can_plat_priv *priv =
-			(struct m_can_plat_priv *)cdev->device_data;
+	struct m_can_plat_priv *priv = cdev->device_data;
 
 	return readl(priv->base + reg);
 }
 
 static u32 iomap_read_fifo(struct m_can_classdev *cdev, int offset)
 {
-	struct m_can_plat_priv *priv =
-			(struct m_can_plat_priv *)cdev->device_data;
+	struct m_can_plat_priv *priv = cdev->device_data;
 
 	return readl(priv->mram_base + offset);
 }
 
 static int iomap_write_reg(struct m_can_classdev *cdev, int reg, int val)
 {
-	struct m_can_plat_priv *priv =
-			(struct m_can_plat_priv *)cdev->device_data;
+	struct m_can_plat_priv *priv = cdev->device_data;
 
 	writel(val, priv->base + reg);
 
@@ -42,8 +39,7 @@ static int iomap_write_reg(struct m_can_classdev *cdev, int reg, int val)
 
 static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, int val)
 {
-	struct m_can_plat_priv *priv =
-			(struct m_can_plat_priv *)cdev->device_data;
+	struct m_can_plat_priv *priv = cdev->device_data;
 
 	writel(val, priv->mram_base + offset);
 
@@ -67,6 +63,9 @@ static int m_can_plat_probe(struct platform_device *pdev)
 	int irq, ret = 0;
 
 	mcan_class = m_can_class_allocate_dev(&pdev->dev);
+	if (!mcan_class)
+		return -ENOMEM;
+
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
index b115b2e5333f..a697996d81b4 100644
--- a/drivers/net/can/m_can/tcan4x5x.c
+++ b/drivers/net/can/m_can/tcan4x5x.c
@@ -113,7 +113,6 @@
 struct tcan4x5x_priv {
 	struct regmap *regmap;
 	struct spi_device *spi;
-	struct mutex tcan4x5x_lock; /* SPI device lock */
 
 	struct m_can_classdev *mcan_dev;
 
@@ -179,7 +178,7 @@ static int regmap_spi_gather_write(void *context, const void *reg,
 		{ .tx_buf = val, .len = val_len, },
 	};
 
-	addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 3;
+	addr = TCAN4X5X_WRITE_CMD | (*((u16 *)reg) << 8) | val_len >> 2;
 
 	spi_message_init(&m);
 	spi_message_add_tail(&t[0], &m);
@@ -193,7 +192,7 @@ static int tcan4x5x_regmap_write(void *context, const void *data, size_t count)
 	u16 *reg = (u16 *)(data);
 	const u32 *val = data + 4;
 
-	return regmap_spi_gather_write(context, reg, 4, val, count);
+	return regmap_spi_gather_write(context, reg, 4, val, count - 4);
 }
 
 static int regmap_spi_async_write(void *context,
@@ -234,7 +233,7 @@ static struct regmap_bus tcan4x5x_bus = {
 
 static u32 tcan4x5x_read_reg(struct m_can_classdev *cdev, int reg)
 {
-	struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *priv = cdev->device_data;
 	u32 val;
 
 	tcan4x5x_check_wake(priv);
@@ -246,7 +245,7 @@ static u32 tcan4x5x_read_reg(struct m_can_classdev *cdev, int reg)
 
 static u32 tcan4x5x_read_fifo(struct m_can_classdev *cdev, int addr_offset)
 {
-	struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *priv = cdev->device_data;
 	u32 val;
 
 	tcan4x5x_check_wake(priv);
@@ -258,7 +257,7 @@ static u32 tcan4x5x_read_fifo(struct m_can_classdev *cdev, int addr_offset)
 
 static int tcan4x5x_write_reg(struct m_can_classdev *cdev, int reg, int val)
 {
-	struct tcan4x5x_priv *priv = (struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *priv = cdev->device_data;
 
 	tcan4x5x_check_wake(priv);
 
@@ -268,8 +267,7 @@ static int tcan4x5x_write_reg(struct m_can_classdev *cdev, int reg, int val)
 static int tcan4x5x_write_fifo(struct m_can_classdev *cdev,
 			       int addr_offset, int val)
 {
-	struct tcan4x5x_priv *priv =
-			(struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *priv = cdev->device_data;
 
 	tcan4x5x_check_wake(priv);
 
@@ -290,8 +288,7 @@ static int tcan4x5x_power_enable(struct regulator *reg, int enable)
 static int tcan4x5x_write_tcan_reg(struct m_can_classdev *cdev,
 				   int reg, int val)
 {
-	struct tcan4x5x_priv *priv =
-			(struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *priv = cdev->device_data;
 
 	tcan4x5x_check_wake(priv);
 
@@ -300,8 +297,7 @@ static int tcan4x5x_write_tcan_reg(struct m_can_classdev *cdev,
 
 static int tcan4x5x_clear_interrupts(struct m_can_classdev *cdev)
 {
-	struct tcan4x5x_priv *tcan4x5x =
-				(struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *tcan4x5x = cdev->device_data;
 	int ret;
 
 	tcan4x5x_check_wake(tcan4x5x);
@@ -331,8 +327,7 @@ static int tcan4x5x_clear_interrupts(struct m_can_classdev *cdev)
 
 static int tcan4x5x_init(struct m_can_classdev *cdev)
 {
-	struct tcan4x5x_priv *tcan4x5x =
-				(struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *tcan4x5x = cdev->device_data;
 	int ret;
 
 	tcan4x5x_check_wake(tcan4x5x);
@@ -359,8 +354,7 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
 
 static int tcan4x5x_parse_config(struct m_can_classdev *cdev)
 {
-	struct tcan4x5x_priv *tcan4x5x =
-				(struct tcan4x5x_priv *)cdev->device_data;
+	struct tcan4x5x_priv *tcan4x5x = cdev->device_data;
 
 	tcan4x5x->interrupt_gpio = devm_gpiod_get(cdev->dev, "data-ready",
 						  GPIOD_IN);
@@ -420,6 +414,9 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	int freq, ret;
 
 	mcan_class = m_can_class_allocate_dev(&spi->dev);
+	if (!mcan_class)
+		return -ENOMEM;
+
 	priv = devm_kzalloc(&spi->dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
@@ -466,8 +463,6 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
 	priv->regmap = devm_regmap_init(&spi->dev, &tcan4x5x_bus,
 					&spi->dev, &tcan4x5x_regmap);
 
-	mutex_init(&priv->tcan4x5x_lock);
-
 	tcan4x5x_power_enable(priv->power, 1);
 
 	ret = m_can_class_register(mcan_class);
diff --git a/drivers/net/can/rcar/rcar_can.c b/drivers/net/can/rcar/rcar_can.c
index cf218949a8fb..bf5adea9c0a3 100644
--- a/drivers/net/can/rcar/rcar_can.c
+++ b/drivers/net/can/rcar/rcar_can.c
@@ -15,11 +15,17 @@
 #include <linux/can/led.h>
 #include <linux/can/dev.h>
 #include <linux/clk.h>
-#include <linux/can/platform/rcar_can.h>
 #include <linux/of.h>
 
 #define RCAR_CAN_DRV_NAME	"rcar_can"
 
+/* Clock Select Register settings */
+enum CLKR {
+	CLKR_CLKP1 = 0, /* Peripheral clock (clkp1) */
+	CLKR_CLKP2 = 1, /* Peripheral clock (clkp2) */
+	CLKR_CLKEXT = 3, /* Externally input clock */
+};
+
 #define RCAR_SUPPORTED_CLOCKS	(BIT(CLKR_CLKP1) | BIT(CLKR_CLKP2) | \
 				 BIT(CLKR_CLKEXT))
 
@@ -736,7 +742,6 @@ static const char * const clock_names[] = {
 
 static int rcar_can_probe(struct platform_device *pdev)
 {
-	struct rcar_can_platform_data *pdata;
 	struct rcar_can_priv *priv;
 	struct net_device *ndev;
 	struct resource *mem;
@@ -745,17 +750,8 @@ static int rcar_can_probe(struct platform_device *pdev)
 	int err = -ENODEV;
 	int irq;
 
-	if (pdev->dev.of_node) {
-		of_property_read_u32(pdev->dev.of_node,
-				     "renesas,can-clock-select", &clock_select);
-	} else {
-		pdata = dev_get_platdata(&pdev->dev);
-		if (!pdata) {
-			dev_err(&pdev->dev, "No platform data provided!\n");
-			goto fail;
-		}
-		clock_select = pdata->clock_select;
-	}
+	of_property_read_u32(pdev->dev.of_node, "renesas,can-clock-select",
+			     &clock_select);
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c
index 68366d57916c..8c0244f51059 100644
--- a/drivers/net/can/sja1000/peak_pci.c
+++ b/drivers/net/can/sja1000/peak_pci.c
@@ -417,7 +417,7 @@ static void peak_pciec_write_reg(const struct sja1000_priv *priv,
 	peak_pci_write_reg(priv, port, val);
 }
 
-static struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = {
+static const struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = {
 	.setsda	= pita_setsda,
 	.setscl	= pita_setscl,
 	.getsda	= pita_getsda,
diff --git a/drivers/net/can/spi/hi311x.c b/drivers/net/can/spi/hi311x.c
index 03a711c3221b..28badace720e 100644
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -21,7 +21,6 @@
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/device.h>
-#include <linux/dma-mapping.h>
 #include <linux/freezer.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -126,10 +125,6 @@
 
 #define DEVICE_NAME "hi3110"
 
-static int hi3110_enable_dma = 1; /* Enable SPI DMA. Default: 1 (On) */
-module_param(hi3110_enable_dma, int, 0444);
-MODULE_PARM_DESC(hi3110_enable_dma, "Enable SPI DMA. Default: 1 (On)");
-
 static const struct can_bittiming_const hi3110_bittiming_const = {
 	.name = DEVICE_NAME,
 	.tseg1_min = 2,
@@ -156,8 +151,6 @@ struct hi3110_priv {
 
 	u8 *spi_tx_buf;
 	u8 *spi_rx_buf;
-	dma_addr_t spi_tx_dma;
-	dma_addr_t spi_rx_dma;
 
 	struct sk_buff *tx_skb;
 	int tx_len;
@@ -217,13 +210,6 @@ static int hi3110_spi_trans(struct spi_device *spi, int len)
 	int ret;
 
 	spi_message_init(&m);
-
-	if (hi3110_enable_dma) {
-		t.tx_dma = priv->spi_tx_dma;
-		t.rx_dma = priv->spi_rx_dma;
-		m.is_dma_mapped = 1;
-	}
-
 	spi_message_add_tail(&t, &m);
 
 	ret = spi_sync(spi, &m);
@@ -915,43 +901,18 @@ static int hi3110_can_probe(struct spi_device *spi)
 	priv->spi = spi;
 	mutex_init(&priv->hi3110_lock);
 
-	/* If requested, allocate DMA buffers */
-	if (hi3110_enable_dma) {
-		spi->dev.coherent_dma_mask = ~0;
-
-		/* Minimum coherent DMA allocation is PAGE_SIZE, so allocate
-		 * that much and share it between Tx and Rx DMA buffers.
-		 */
-		priv->spi_tx_buf = dmam_alloc_coherent(&spi->dev,
-						       PAGE_SIZE,
-						       &priv->spi_tx_dma,
-						       GFP_DMA);
-
-		if (priv->spi_tx_buf) {
-			priv->spi_rx_buf = (priv->spi_tx_buf + (PAGE_SIZE / 2));
-			priv->spi_rx_dma = (dma_addr_t)(priv->spi_tx_dma +
-							(PAGE_SIZE / 2));
-		} else {
-			/* Fall back to non-DMA */
-			hi3110_enable_dma = 0;
-		}
+	priv->spi_tx_buf = devm_kzalloc(&spi->dev, HI3110_RX_BUF_LEN,
+					GFP_KERNEL);
+	if (!priv->spi_tx_buf) {
+		ret = -ENOMEM;
+		goto error_probe;
 	}
+	priv->spi_rx_buf = devm_kzalloc(&spi->dev, HI3110_RX_BUF_LEN,
+					GFP_KERNEL);
 
-	/* Allocate non-DMA buffers */
-	if (!hi3110_enable_dma) {
-		priv->spi_tx_buf = devm_kzalloc(&spi->dev, HI3110_RX_BUF_LEN,
-						GFP_KERNEL);
-		if (!priv->spi_tx_buf) {
-			ret = -ENOMEM;
-			goto error_probe;
-		}
-		priv->spi_rx_buf = devm_kzalloc(&spi->dev, HI3110_RX_BUF_LEN,
-						GFP_KERNEL);
-
-		if (!priv->spi_rx_buf) {
-			ret = -ENOMEM;
-			goto error_probe;
-		}
+	if (!priv->spi_rx_buf) {
+		ret = -ENOMEM;
+		goto error_probe;
 	}
 
 	SET_NETDEV_DEV(net, &spi->dev);
diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index 12358f06d194..05547dd36d61 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -1,6 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/*
- * CAN bus driver for Microchip 251x/25625 CAN Controller with SPI Interface
+/* CAN bus driver for Microchip 251x/25625 CAN Controller with SPI Interface
  *
  * MCP2510 support and bug fixes by Christian Pellegrin
  * <chripell@evolware.org>
@@ -48,7 +47,6 @@
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/device.h>
-#include <linux/dma-mapping.h>
 #include <linux/freezer.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
@@ -75,7 +73,6 @@
 #define RTS_TXB2		0x04
 #define INSTRUCTION_RTS(n)	(0x80 | ((n) & 0x07))
 
-
 /* MPC251x registers */
 #define CANSTAT	      0x0e
 #define CANCTRL	      0x0f
@@ -191,8 +188,7 @@
 #define SET_BYTE(val, byte)			\
 	(((val) & 0xff) << ((byte) * 8))
 
-/*
- * Buffer size required for the largest SPI transfer (i.e., reading a
+/* Buffer size required for the largest SPI transfer (i.e., reading a
  * frame)
  */
 #define CAN_FRAME_MAX_DATA_LEN	8
@@ -205,10 +201,6 @@
 
 #define DEVICE_NAME "mcp251x"
 
-static int mcp251x_enable_dma; /* Enable SPI DMA. Default: 0 (Off) */
-module_param(mcp251x_enable_dma, int, 0444);
-MODULE_PARM_DESC(mcp251x_enable_dma, "Enable SPI DMA. Default: 0 (Off)");
-
 static const struct can_bittiming_const mcp251x_bittiming_const = {
 	.name = DEVICE_NAME,
 	.tseg1_min = 3,
@@ -237,8 +229,6 @@ struct mcp251x_priv {
 
 	u8 *spi_tx_buf;
 	u8 *spi_rx_buf;
-	dma_addr_t spi_tx_dma;
-	dma_addr_t spi_rx_dma;
 
 	struct sk_buff *tx_skb;
 	int tx_len;
@@ -282,8 +272,7 @@ static void mcp251x_clean(struct net_device *net)
 	priv->tx_len = 0;
 }
 
-/*
- * Note about handling of error return of mcp251x_spi_trans: accessing
+/* Note about handling of error return of mcp251x_spi_trans: accessing
  * registers via SPI is not really different conceptually than using
  * normal I/O assembler instructions, although it's much more
  * complicated from a practical POV. So it's not advisable to always
@@ -308,13 +297,6 @@ static int mcp251x_spi_trans(struct spi_device *spi, int len)
 	int ret;
 
 	spi_message_init(&m);
-
-	if (mcp251x_enable_dma) {
-		t.tx_dma = priv->spi_tx_dma;
-		t.rx_dma = priv->spi_rx_dma;
-		m.is_dma_mapped = 1;
-	}
-
 	spi_message_add_tail(&t, &m);
 
 	ret = spi_sync(spi, &m);
@@ -323,7 +305,7 @@ static int mcp251x_spi_trans(struct spi_device *spi, int len)
 	return ret;
 }
 
-static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg)
+static u8 mcp251x_read_reg(struct spi_device *spi, u8 reg)
 {
 	struct mcp251x_priv *priv = spi_get_drvdata(spi);
 	u8 val = 0;
@@ -337,8 +319,7 @@ static u8 mcp251x_read_reg(struct spi_device *spi, uint8_t reg)
 	return val;
 }
 
-static void mcp251x_read_2regs(struct spi_device *spi, uint8_t reg,
-		uint8_t *v1, uint8_t *v2)
+static void mcp251x_read_2regs(struct spi_device *spi, u8 reg, u8 *v1, u8 *v2)
 {
 	struct mcp251x_priv *priv = spi_get_drvdata(spi);
 
@@ -351,7 +332,7 @@ static void mcp251x_read_2regs(struct spi_device *spi, uint8_t reg,
 	*v2 = priv->spi_rx_buf[3];
 }
 
-static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val)
+static void mcp251x_write_reg(struct spi_device *spi, u8 reg, u8 val)
 {
 	struct mcp251x_priv *priv = spi_get_drvdata(spi);
 
@@ -363,7 +344,7 @@ static void mcp251x_write_reg(struct spi_device *spi, u8 reg, uint8_t val)
 }
 
 static void mcp251x_write_bits(struct spi_device *spi, u8 reg,
-			       u8 mask, uint8_t val)
+			       u8 mask, u8 val)
 {
 	struct mcp251x_priv *priv = spi_get_drvdata(spi);
 
@@ -565,8 +546,7 @@ static int mcp251x_set_normal_mode(struct spi_device *spi)
 		while (mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) {
 			schedule();
 			if (time_after(jiffies, timeout)) {
-				dev_err(&spi->dev, "MCP251x didn't"
-					" enter in normal mode\n");
+				dev_err(&spi->dev, "MCP251x didn't enter in normal mode\n");
 				return -EBUSY;
 			}
 		}
@@ -612,7 +592,7 @@ static int mcp251x_setup(struct net_device *net, struct spi_device *spi)
 static int mcp251x_hw_reset(struct spi_device *spi)
 {
 	struct mcp251x_priv *priv = spi_get_drvdata(spi);
-	u8 reg;
+	unsigned long timeout;
 	int ret;
 
 	/* Wait for oscillator startup timer after power up */
@@ -626,10 +606,19 @@ static int mcp251x_hw_reset(struct spi_device *spi)
 	/* Wait for oscillator startup timer after reset */
 	mdelay(MCP251X_OST_DELAY_MS);
 
-	reg = mcp251x_read_reg(spi, CANSTAT);
-	if ((reg & CANCTRL_REQOP_MASK) != CANCTRL_REQOP_CONF)
-		return -ENODEV;
-
+	/* Wait for reset to finish */
+	timeout = jiffies + HZ;
+	while ((mcp251x_read_reg(spi, CANSTAT) & CANCTRL_REQOP_MASK) !=
+	       CANCTRL_REQOP_CONF) {
+		usleep_range(MCP251X_OST_DELAY_MS * 1000,
+			     MCP251X_OST_DELAY_MS * 1000 * 2);
+
+		if (time_after(jiffies, timeout)) {
+			dev_err(&spi->dev,
+				"MCP251x didn't enter in conf mode after reset\n");
+			return -EBUSY;
+		}
+	}
 	return 0;
 }
 
@@ -799,7 +788,8 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
 			 * (The MCP2515/25625 does this automatically.)
 			 */
 			if (mcp251x_is_2510(spi))
-				mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00);
+				mcp251x_write_bits(spi, CANINTF,
+						   CANINTF_RX0IF, 0x00);
 		}
 
 		/* receive buffer 1 */
@@ -900,7 +890,6 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
 			}
 			netif_wake_queue(net);
 		}
-
 	}
 	mutex_unlock(&priv->mcp_lock);
 	return IRQ_HANDLED;
@@ -910,7 +899,7 @@ static int mcp251x_open(struct net_device *net)
 {
 	struct mcp251x_priv *priv = netdev_priv(net);
 	struct spi_device *spi = priv->spi;
-	unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_FALLING;
+	unsigned long flags = 0;
 	int ret;
 
 	ret = open_candev(net);
@@ -926,8 +915,12 @@ static int mcp251x_open(struct net_device *net)
 	priv->tx_skb = NULL;
 	priv->tx_len = 0;
 
+	if (!spi->dev.of_node)
+		flags = IRQF_TRIGGER_FALLING;
+
 	ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist,
-				   flags | IRQF_ONESHOT, DEVICE_NAME, priv);
+				   flags | IRQF_ONESHOT, dev_name(&spi->dev),
+				   priv);
 	if (ret) {
 		dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
 		goto out_close;
@@ -1090,43 +1083,18 @@ static int mcp251x_can_probe(struct spi_device *spi)
 	priv->spi = spi;
 	mutex_init(&priv->mcp_lock);
 
-	/* If requested, allocate DMA buffers */
-	if (mcp251x_enable_dma) {
-		spi->dev.coherent_dma_mask = ~0;
-
-		/*
-		 * Minimum coherent DMA allocation is PAGE_SIZE, so allocate
-		 * that much and share it between Tx and Rx DMA buffers.
-		 */
-		priv->spi_tx_buf = dmam_alloc_coherent(&spi->dev,
-						       PAGE_SIZE,
-						       &priv->spi_tx_dma,
-						       GFP_DMA);
-
-		if (priv->spi_tx_buf) {
-			priv->spi_rx_buf = (priv->spi_tx_buf + (PAGE_SIZE / 2));
-			priv->spi_rx_dma = (dma_addr_t)(priv->spi_tx_dma +
-							(PAGE_SIZE / 2));
-		} else {
-			/* Fall back to non-DMA */
-			mcp251x_enable_dma = 0;
-		}
+	priv->spi_tx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
+					GFP_KERNEL);
+	if (!priv->spi_tx_buf) {
+		ret = -ENOMEM;
+		goto error_probe;
 	}
 
-	/* Allocate non-DMA buffers */
-	if (!mcp251x_enable_dma) {
-		priv->spi_tx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
-						GFP_KERNEL);
-		if (!priv->spi_tx_buf) {
-			ret = -ENOMEM;
-			goto error_probe;
-		}
-		priv->spi_rx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
-						GFP_KERNEL);
-		if (!priv->spi_rx_buf) {
-			ret = -ENOMEM;
-			goto error_probe;
-		}
+	priv->spi_rx_buf = devm_kzalloc(&spi->dev, SPI_TRANSFER_BUF_LEN,
+					GFP_KERNEL);
+	if (!priv->spi_rx_buf) {
+		ret = -ENOMEM;
+		goto error_probe;
 	}
 
 	SET_NETDEV_DEV(net, &spi->dev);
@@ -1135,7 +1103,8 @@ static int mcp251x_can_probe(struct spi_device *spi)
 	ret = mcp251x_hw_probe(spi);
 	if (ret) {
 		if (ret == -ENODEV)
-			dev_err(&spi->dev, "Cannot initialize MCP%x. Wrong wiring?\n", priv->model);
+			dev_err(&spi->dev, "Cannot initialize MCP%x. Wrong wiring?\n",
+				priv->model);
 		goto error_probe;
 	}
 
@@ -1189,8 +1158,7 @@ static int __maybe_unused mcp251x_can_suspend(struct device *dev)
 
 	priv->force_quit = 1;
 	disable_irq(spi->irq);
-	/*
-	 * Note: at this point neither IST nor workqueues are running.
+	/* Note: at this point neither IST nor workqueues are running.
 	 * open/stop cannot be called anyway so locking is not needed
 	 */
 	if (netif_running(net)) {
diff --git a/include/linux/can/platform/rcar_can.h b/include/linux/can/platform/rcar_can.h
deleted file mode 100644
index a43dcd0cf79e..000000000000
--- a/include/linux/can/platform/rcar_can.h
+++ /dev/null
@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _CAN_PLATFORM_RCAR_CAN_H_
-#define _CAN_PLATFORM_RCAR_CAN_H_
-
-#include <linux/types.h>
-
-/* Clock Select Register settings */
-enum CLKR {
-	CLKR_CLKP1 = 0,	/* Peripheral clock (clkp1) */
-	CLKR_CLKP2 = 1,	/* Peripheral clock (clkp2) */
-	CLKR_CLKEXT = 3	/* Externally input clock */
-};
-
-struct rcar_can_platform_data {
-	enum CLKR clock_select;	/* Clock source select */
-};
-
-#endif	/* !_CAN_PLATFORM_RCAR_CAN_H_ */