Merge tag 'mailbox-v5.13' of git://git.linaro.org/landing-teams/working/fujitsu/integration

Pull mailbox updates from Jassi Brar:
 "qcom:
   - enable support for SM8350 and SC7280

  sprd:
   - refcount channel usage
   - specify interrupt names in dt
   - support sc9863a

  arm:
   - drop redundant print

  ti:
   - convert dt-bindings to json schema

  and misc spelling fixes"

* tag 'mailbox-v5.13' of git://git.linaro.org/landing-teams/working/fujitsu/integration:
  dt-bindings: mailbox: qcom-ipcc: Add compatible for SC7280
  dt-bindings: mailbox: ti,secure-proxy: Convert to json schema
  mailbox: arm_mhu_db: Remove redundant dev_err call in mhu_db_probe()
  mailbox: sprd: Add supplementary inbox support
  dt-bindings: mailbox: Add interrupt-names to SPRD mailbox
  mailbox: sprd: Introduce refcnt when clients requests/free channels
  MAINTAINERS: Add DT bindings directory to mailbox
  mailbox: fix various typos in comments
  mailbox: pcc: fix platform_no_drv_owner.cocci warnings
  dt-bindings: mailbox: Add compatible for SM8350 IPCC

14 files changed, 212 insertions, 105 deletions

diff --git a/Documentation/devicetree/bindings/mailbox/qcom-ipcc.yaml b/Documentation/devicetree/bindings/mailbox/qcom-ipcc.yaml
index 168beeb7e9f7..b222f993b232 100644
--- a/Documentation/devicetree/bindings/mailbox/qcom-ipcc.yaml
+++ b/Documentation/devicetree/bindings/mailbox/qcom-ipcc.yaml
@@ -25,6 +25,8 @@ properties:
     items:
       - enum:
           - qcom,sm8250-ipcc
+          - qcom,sm8350-ipcc
+          - qcom,sc7280-ipcc
       - const: qcom,ipcc
 
   reg:
diff --git a/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml
index 26a5cca3f838..80feba82cbd6 100644
--- a/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml
+++ b/Documentation/devicetree/bindings/mailbox/sprd-mailbox.yaml
@@ -15,6 +15,7 @@ properties:
   compatible:
     enum:
       - sprd,sc9860-mailbox
+      - sprd,sc9863a-mailbox
 
   reg:
     items:
@@ -22,9 +23,15 @@ properties:
       - description: outbox registers' base address
 
   interrupts:
+    minItems: 2
+    maxItems: 3
+
+  interrupt-names:
+    minItems: 2
     items:
-      - description: inbox interrupt
-      - description: outbox interrupt
+      - const: inbox
+      - const: outbox
+      - const: supp-outbox
 
   clocks:
     maxItems: 1
@@ -40,6 +47,7 @@ required:
   - compatible
   - reg
   - interrupts
+  - interrupt-names
   - "#mbox-cells"
   - clocks
   - clock-names
@@ -56,5 +64,6 @@ examples:
       clock-names = "enable";
       clocks = <&aon_gate 53>;
       interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>, <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
+      interrupt-names = "inbox", "outbox";
     };
 ...
diff --git a/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.txt b/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.txt
deleted file mode 100644
index 6c9c7daf0f5c..000000000000
--- a/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.txt
+++ /dev/null
@@ -1,50 +0,0 @@
-Texas Instruments' Secure Proxy
-========================================
-
-The Texas Instruments' secure proxy is a mailbox controller that has
-configurable queues selectable at SoC(System on Chip) integration. The
-Message manager is broken up into different address regions that are
-called "threads" or "proxies" - each instance is unidirectional and is
-instantiated at SoC integration level by system controller to indicate
-receive or transmit path.
-
-Message Manager Device Node:
-===========================
-Required properties:
---------------------
-- compatible:		Shall be "ti,am654-secure-proxy"
-- reg-names 		target_data - Map the proxy data region
-			rt - Map the realtime status region
-			scfg - Map the configuration region
-- reg:			Contains the register map per reg-names.
-- #mbox-cells		Shall be 1 and shall refer to the transfer path
-			called thread.
-- interrupt-names:	Contains interrupt names matching the rx transfer path
-			for a given SoC. Receive interrupts shall be of the
-			format: "rx_<PID>".
-- interrupts:		Contains the interrupt information corresponding to
-			interrupt-names property.
-
-Example(AM654):
-------------
-
-	secure_proxy: mailbox@32c00000 {
-		compatible = "ti,am654-secure-proxy";
-		#mbox-cells = <1>;
-		reg-names = "target_data", "rt", "scfg";
-		reg = <0x0 0x32c00000 0x0 0x100000>,
-		      <0x0 0x32400000 0x0 0x100000>,
-		      <0x0 0x32800000 0x0 0x100000>;
-		interrupt-names = "rx_011";
-		interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
-	};
-
-	dmsc: dmsc {
-		[...]
-		mbox-names = "rx", "tx";
-		# RX Thread ID is 11
-		# TX Thread ID is 13
-		mboxes= <&secure_proxy 11>,
-			<&secure_proxy 13>;
-		[...]
-	};
diff --git a/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.yaml b/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.yaml
new file mode 100644
index 000000000000..eea822861804
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.yaml
@@ -0,0 +1,79 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/ti,secure-proxy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments' Secure Proxy
+
+maintainers:
+  - Nishanth Menon <nm@ti.com>
+
+description: |
+  The Texas Instruments' secure proxy is a mailbox controller that has
+  configurable queues selectable at SoC(System on Chip) integration. The
+  Message manager is broken up into different address regions that are
+  called "threads" or "proxies" - each instance is unidirectional and is
+  instantiated at SoC integration level by system controller to indicate
+  receive or transmit path.
+
+properties:
+  $nodename:
+    pattern: "^mailbox@[0-9a-f]+$"
+
+  compatible:
+    const: ti,am654-secure-proxy
+
+  "#mbox-cells":
+    const: 1
+    description:
+      Contains the secure proxy thread ID used for the specific transfer path.
+
+  reg-names:
+    items:
+      - const: target_data
+      - const: rt
+      - const: scfg
+
+  reg:
+    minItems: 3
+
+  interrupt-names:
+    minItems: 1
+    maxItems: 100
+    items:
+      pattern: "^rx_[0-9]{3}$"
+    description:
+      Contains the interrupt name information for the Rx interrupt path for
+      secure proxy thread in the form 'rx_<PID>'.
+
+  interrupts:
+    minItems: 1
+    maxItems: 100
+    description:
+      Contains the interrupt information for the Rx interrupt path for secure
+      proxy.
+
+required:
+  - compatible
+  - reg-names
+  - reg
+  - interrupt-names
+  - interrupts
+  - "#mbox-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    secure_proxy: mailbox@32c00000 {
+          compatible = "ti,am654-secure-proxy";
+          #mbox-cells = <1>;
+          reg-names = "target_data", "rt", "scfg";
+          reg = <0x32c00000 0x100000>,
+                <0x32400000 0x100000>,
+                <0x32800000 0x100000>;
+          interrupt-names = "rx_011";
+          interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index bccfb16e3d98..8f4a072f47ae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10772,6 +10772,7 @@ S:	Maintained
 F:	drivers/mailbox/
 F:	include/linux/mailbox_client.h
 F:	include/linux/mailbox_controller.h
+F:	Documentation/devicetree/bindings/mailbox/
 
 MAILBOX ARM MHUv2
 M:	Viresh Kumar <viresh.kumar@linaro.org>
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index f4abe3529acd..68de2c6af727 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -78,7 +78,7 @@ config OMAP_MBOX_KFIFO_SIZE
 	  module parameter).
 
 config ROCKCHIP_MBOX
-	bool "Rockchip Soc Intergrated Mailbox Support"
+	bool "Rockchip Soc Integrated Mailbox Support"
 	depends on ARCH_ROCKCHIP || COMPILE_TEST
 	help
 	  This driver provides support for inter-processor communication
diff --git a/drivers/mailbox/arm_mhu_db.c b/drivers/mailbox/arm_mhu_db.c
index 8eb66c4ecf5b..8674153cc893 100644
--- a/drivers/mailbox/arm_mhu_db.c
+++ b/drivers/mailbox/arm_mhu_db.c
@@ -278,10 +278,8 @@ static int mhu_db_probe(struct amba_device *adev, const struct amba_id *id)
 		return -ENOMEM;
 
 	mhu->base = devm_ioremap_resource(dev, &adev->res);
-	if (IS_ERR(mhu->base)) {
-		dev_err(dev, "ioremap failed\n");
+	if (IS_ERR(mhu->base))
 		return PTR_ERR(mhu->base);
-	}
 
 	chans = devm_kcalloc(dev, max_chans, sizeof(*chans), GFP_KERNEL);
 	if (!chans)
diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
index bee33abb5308..b4f33dc399a0 100644
--- a/drivers/mailbox/bcm-flexrm-mailbox.c
+++ b/drivers/mailbox/bcm-flexrm-mailbox.c
@@ -423,7 +423,7 @@ static void flexrm_enqueue_desc(u32 nhpos, u32 nhcnt, u32 reqid,
 	 *
 	 * In general use, number of non-HEADER descriptors can easily go
 	 * beyond 31. To tackle this situation, we have packet (or request)
-	 * extenstion bits (STARTPKT and ENDPKT) in the HEADER descriptor.
+	 * extension bits (STARTPKT and ENDPKT) in the HEADER descriptor.
 	 *
 	 * To use packet extension, the first HEADER descriptor of request
 	 * (or packet) will have STARTPKT=1 and ENDPKT=0. The intermediate
@@ -1095,7 +1095,7 @@ static int flexrm_process_completions(struct flexrm_ring *ring)
 	/*
 	 * Get current completion read and write offset
 	 *
-	 * Note: We should read completion write pointer atleast once
+	 * Note: We should read completion write pointer at least once
 	 * after we get a MSI interrupt because HW maintains internal
 	 * MSI status which will allow next MSI interrupt only after
 	 * completion write pointer is read.
diff --git a/drivers/mailbox/mailbox-xgene-slimpro.c b/drivers/mailbox/mailbox-xgene-slimpro.c
index de260799f1b9..5b3a2dcd5955 100644
--- a/drivers/mailbox/mailbox-xgene-slimpro.c
+++ b/drivers/mailbox/mailbox-xgene-slimpro.c
@@ -51,10 +51,10 @@ struct slimpro_mbox_chan {
 /**
  * X-Gene SlimPRO Mailbox controller data
  *
- * X-Gene SlimPRO Mailbox controller has 8 commnunication channels.
- * Each channel has a separate IRQ number assgined to it.
+ * X-Gene SlimPRO Mailbox controller has 8 communication channels.
+ * Each channel has a separate IRQ number assigned to it.
  *
- * @mb_ctrl:	Representation of the commnunication channel controller
+ * @mb_ctrl:	Representation of the communication channel controller
  * @mc:		Array of SlimPRO mailbox channels of the controller
  * @chans:	Array of mailbox communication channels
  *
diff --git a/drivers/mailbox/mailbox.h b/drivers/mailbox/mailbox.h
index 4e3cc4426513..046d6d258b32 100644
--- a/drivers/mailbox/mailbox.h
+++ b/drivers/mailbox/mailbox.h
@@ -5,6 +5,6 @@
 
 #define TXDONE_BY_IRQ	BIT(0) /* controller has remote RTR irq */
 #define TXDONE_BY_POLL	BIT(1) /* controller can read status of last TX */
-#define TXDONE_BY_ACK	BIT(2) /* S/W ACK recevied by Client ticks the TX */
+#define TXDONE_BY_ACK	BIT(2) /* S/W ACK received by Client ticks the TX */
 
 #endif /* __MAILBOX_H */
diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index ef9ecd1f5958..0296558f9e22 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -32,7 +32,7 @@
  *  * Client writes WRITE cmd in communication region cmd address.
  *  * Client issues mbox_send_message() which rings the PCC doorbell
  *		for its PCC channel.
- *  * If command completes, then writes have succeded and it can release
+ *  * If command completes, then writes have succeeded and it can release
  *		the channel lock.
  *
  *  There is a Nominal latency defined for each channel which indicates
@@ -577,7 +577,6 @@ static struct platform_driver pcc_mbox_driver = {
 	.probe = pcc_mbox_probe,
 	.driver = {
 		.name = "PCCT",
-		.owner = THIS_MODULE,
 	},
 };
 
diff --git a/drivers/mailbox/pl320-ipc.c b/drivers/mailbox/pl320-ipc.c
index 25e0b6f7a10f..fbcf07930390 100644
--- a/drivers/mailbox/pl320-ipc.c
+++ b/drivers/mailbox/pl320-ipc.c
@@ -73,7 +73,7 @@ static u32 __ipc_rcv(int mbox, u32 *data)
 	return data[1];
 }
 
-/* blocking implmentation from the A9 side, not usuable in interrupts! */
+/* blocking implementation from the A9 side, not usable in interrupts! */
 int pl320_ipc_transmit(u32 *data)
 {
 	int ret;
diff --git a/drivers/mailbox/sprd-mailbox.c b/drivers/mailbox/sprd-mailbox.c
index 4c325301a2fe..e3c899abeed8 100644
--- a/drivers/mailbox/sprd-mailbox.c
+++ b/drivers/mailbox/sprd-mailbox.c
@@ -11,6 +11,7 @@
 #include <linux/io.h>
 #include <linux/mailbox_controller.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 
@@ -25,41 +26,47 @@
 #define SPRD_MBOX_LOCK		0x20
 #define SPRD_MBOX_FIFO_DEPTH	0x24
 
-/* Bit and mask definiation for inbox's SPRD_MBOX_FIFO_STS register */
+/* Bit and mask definition for inbox's SPRD_MBOX_FIFO_STS register */
 #define SPRD_INBOX_FIFO_DELIVER_MASK		GENMASK(23, 16)
 #define SPRD_INBOX_FIFO_OVERLOW_MASK		GENMASK(15, 8)
 #define SPRD_INBOX_FIFO_DELIVER_SHIFT		16
 #define SPRD_INBOX_FIFO_BUSY_MASK		GENMASK(7, 0)
 
-/* Bit and mask definiation for SPRD_MBOX_IRQ_STS register */
+/* Bit and mask definition for SPRD_MBOX_IRQ_STS register */
 #define SPRD_MBOX_IRQ_CLR			BIT(0)
 
-/* Bit and mask definiation for outbox's SPRD_MBOX_FIFO_STS register */
+/* Bit and mask definition for outbox's SPRD_MBOX_FIFO_STS register */
 #define SPRD_OUTBOX_FIFO_FULL			BIT(2)
 #define SPRD_OUTBOX_FIFO_WR_SHIFT		16
 #define SPRD_OUTBOX_FIFO_RD_SHIFT		24
 #define SPRD_OUTBOX_FIFO_POS_MASK		GENMASK(7, 0)
 
-/* Bit and mask definiation for inbox's SPRD_MBOX_IRQ_MSK register */
+/* Bit and mask definition for inbox's SPRD_MBOX_IRQ_MSK register */
 #define SPRD_INBOX_FIFO_BLOCK_IRQ		BIT(0)
 #define SPRD_INBOX_FIFO_OVERFLOW_IRQ		BIT(1)
 #define SPRD_INBOX_FIFO_DELIVER_IRQ		BIT(2)
 #define SPRD_INBOX_FIFO_IRQ_MASK		GENMASK(2, 0)
 
-/* Bit and mask definiation for outbox's SPRD_MBOX_IRQ_MSK register */
+/* Bit and mask definition for outbox's SPRD_MBOX_IRQ_MSK register */
 #define SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ		BIT(0)
 #define SPRD_OUTBOX_FIFO_IRQ_MASK		GENMASK(4, 0)
 
+#define SPRD_OUTBOX_BASE_SPAN			0x1000
 #define SPRD_MBOX_CHAN_MAX			8
+#define SPRD_SUPP_INBOX_ID_SC9863A		7
 
 struct sprd_mbox_priv {
 	struct mbox_controller	mbox;
 	struct device		*dev;
 	void __iomem		*inbox_base;
 	void __iomem		*outbox_base;
+	/*  Base register address for supplementary outbox */
+	void __iomem		*supp_base;
 	struct clk		*clk;
 	u32			outbox_fifo_depth;
 
+	struct mutex		lock;
+	u32			refcnt;
 	struct mbox_chan	chan[SPRD_MBOX_CHAN_MAX];
 };
 
@@ -94,14 +101,13 @@ static u32 sprd_mbox_get_fifo_len(struct sprd_mbox_priv *priv, u32 fifo_sts)
 	return fifo_len;
 }
 
-static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
+static irqreturn_t do_outbox_isr(void __iomem *base, struct sprd_mbox_priv *priv)
 {
-	struct sprd_mbox_priv *priv = data;
 	struct mbox_chan *chan;
 	u32 fifo_sts, fifo_len, msg[2];
 	int i, id;
 
-	fifo_sts = readl(priv->outbox_base + SPRD_MBOX_FIFO_STS);
+	fifo_sts = readl(base + SPRD_MBOX_FIFO_STS);
 
 	fifo_len = sprd_mbox_get_fifo_len(priv, fifo_sts);
 	if (!fifo_len) {
@@ -110,23 +116,41 @@ static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
 	}
 
 	for (i = 0; i < fifo_len; i++) {
-		msg[0] = readl(priv->outbox_base + SPRD_MBOX_MSG_LOW);
-		msg[1] = readl(priv->outbox_base + SPRD_MBOX_MSG_HIGH);
-		id = readl(priv->outbox_base + SPRD_MBOX_ID);
+		msg[0] = readl(base + SPRD_MBOX_MSG_LOW);
+		msg[1] = readl(base + SPRD_MBOX_MSG_HIGH);
+		id = readl(base + SPRD_MBOX_ID);
 
 		chan = &priv->chan[id];
-		mbox_chan_received_data(chan, (void *)msg);
+		if (chan->cl)
+			mbox_chan_received_data(chan, (void *)msg);
+		else
+			dev_warn_ratelimited(priv->dev,
+				    "message's been dropped at ch[%d]\n", id);
 
 		/* Trigger to update outbox FIFO pointer */
-		writel(0x1, priv->outbox_base + SPRD_MBOX_TRIGGER);
+		writel(0x1, base + SPRD_MBOX_TRIGGER);
 	}
 
 	/* Clear irq status after reading all message. */
-	writel(SPRD_MBOX_IRQ_CLR, priv->outbox_base + SPRD_MBOX_IRQ_STS);
+	writel(SPRD_MBOX_IRQ_CLR, base + SPRD_MBOX_IRQ_STS);
 
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
+{
+	struct sprd_mbox_priv *priv = data;
+
+	return do_outbox_isr(priv->outbox_base, priv);
+}
+
+static irqreturn_t sprd_mbox_supp_isr(int irq, void *data)
+{
+	struct sprd_mbox_priv *priv = data;
+
+	return do_outbox_isr(priv->supp_base, priv);
+}
+
 static irqreturn_t sprd_mbox_inbox_isr(int irq, void *data)
 {
 	struct sprd_mbox_priv *priv = data;
@@ -150,7 +174,7 @@ static irqreturn_t sprd_mbox_inbox_isr(int irq, void *data)
 		chan = &priv->chan[id];
 
 		/*
-		 * Check if the message was fetched by remote traget, if yes,
+		 * Check if the message was fetched by remote target, if yes,
 		 * that means the transmission has been completed.
 		 */
 		busy = fifo_sts & SPRD_INBOX_FIFO_BUSY_MASK;
@@ -215,18 +239,30 @@ static int sprd_mbox_startup(struct mbox_chan *chan)
 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);
 	u32 val;
 
-	/* Select outbox FIFO mode and reset the outbox FIFO status */
-	writel(0x0, priv->outbox_base + SPRD_MBOX_FIFO_RST);
-
-	/* Enable inbox FIFO overflow and delivery interrupt */
-	val = readl(priv->inbox_base + SPRD_MBOX_IRQ_MSK);
-	val &= ~(SPRD_INBOX_FIFO_OVERFLOW_IRQ | SPRD_INBOX_FIFO_DELIVER_IRQ);
-	writel(val, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
-
-	/* Enable outbox FIFO not empty interrupt */
-	val = readl(priv->outbox_base + SPRD_MBOX_IRQ_MSK);
-	val &= ~SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ;
-	writel(val, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+	mutex_lock(&priv->lock);
+	if (priv->refcnt++ == 0) {
+		/* Select outbox FIFO mode and reset the outbox FIFO status */
+		writel(0x0, priv->outbox_base + SPRD_MBOX_FIFO_RST);
+
+		/* Enable inbox FIFO overflow and delivery interrupt */
+		val = readl(priv->inbox_base + SPRD_MBOX_IRQ_MSK);
+		val &= ~(SPRD_INBOX_FIFO_OVERFLOW_IRQ | SPRD_INBOX_FIFO_DELIVER_IRQ);
+		writel(val, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
+
+		/* Enable outbox FIFO not empty interrupt */
+		val = readl(priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+		val &= ~SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ;
+		writel(val, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+
+		/* Enable supplementary outbox as the fundamental one */
+		if (priv->supp_base) {
+			writel(0x0, priv->supp_base + SPRD_MBOX_FIFO_RST);
+			val = readl(priv->supp_base + SPRD_MBOX_IRQ_MSK);
+			val &= ~SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ;
+			writel(val, priv->supp_base + SPRD_MBOX_IRQ_MSK);
+		}
+	}
+	mutex_unlock(&priv->lock);
 
 	return 0;
 }
@@ -235,9 +271,17 @@ static void sprd_mbox_shutdown(struct mbox_chan *chan)
 {
 	struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);
 
-	/* Disable inbox & outbox interrupt */
-	writel(SPRD_INBOX_FIFO_IRQ_MASK, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
-	writel(SPRD_OUTBOX_FIFO_IRQ_MASK, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+	mutex_lock(&priv->lock);
+	if (--priv->refcnt == 0) {
+		/* Disable inbox & outbox interrupt */
+		writel(SPRD_INBOX_FIFO_IRQ_MASK, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
+		writel(SPRD_OUTBOX_FIFO_IRQ_MASK, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+
+		if (priv->supp_base)
+			writel(SPRD_OUTBOX_FIFO_IRQ_MASK,
+			       priv->supp_base + SPRD_MBOX_IRQ_MSK);
+	}
+	mutex_unlock(&priv->lock);
 }
 
 static const struct mbox_chan_ops sprd_mbox_ops = {
@@ -258,21 +302,26 @@ static int sprd_mbox_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct sprd_mbox_priv *priv;
-	int ret, inbox_irq, outbox_irq;
-	unsigned long id;
+	int ret, inbox_irq, outbox_irq, supp_irq;
+	unsigned long id, supp;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
 	priv->dev = dev;
+	mutex_init(&priv->lock);
 
 	/*
-	 * The Spreadtrum mailbox uses an inbox to send messages to the target
-	 * core, and uses an outbox to receive messages from other cores.
+	 * Unisoc mailbox uses an inbox to send messages to the target
+	 * core, and uses (an) outbox(es) to receive messages from other
+	 * cores.
 	 *
-	 * Thus the mailbox controller supplies 2 different register addresses
-	 * and IRQ numbers for inbox and outbox.
+	 * Thus in general the mailbox controller supplies 2 different
+	 * register addresses and IRQ numbers for inbox and outbox.
+	 *
+	 * If necessary, a supplementary inbox could be enabled optionally
+	 * with an independent FIFO and an extra interrupt.
 	 */
 	priv->inbox_base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(priv->inbox_base))
@@ -298,7 +347,7 @@ static int sprd_mbox_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	inbox_irq = platform_get_irq(pdev, 0);
+	inbox_irq = platform_get_irq_byname(pdev, "inbox");
 	if (inbox_irq < 0)
 		return inbox_irq;
 
@@ -309,7 +358,7 @@ static int sprd_mbox_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	outbox_irq = platform_get_irq(pdev, 1);
+	outbox_irq = platform_get_irq_byname(pdev, "outbox");
 	if (outbox_irq < 0)
 		return outbox_irq;
 
@@ -320,6 +369,24 @@ static int sprd_mbox_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	/* Supplementary outbox IRQ is optional */
+	supp_irq = platform_get_irq_byname(pdev, "supp-outbox");
+	if (supp_irq > 0) {
+		ret = devm_request_irq(dev, supp_irq, sprd_mbox_supp_isr,
+				       IRQF_NO_SUSPEND, dev_name(dev), priv);
+		if (ret) {
+			dev_err(dev, "failed to request outbox IRQ: %d\n", ret);
+			return ret;
+		}
+
+		supp = (unsigned long) of_device_get_match_data(dev);
+		if (!supp) {
+			dev_err(dev, "no supplementary outbox specified\n");
+			return -ENODEV;
+		}
+		priv->supp_base = priv->outbox_base + (SPRD_OUTBOX_BASE_SPAN * supp);
+	}
+
 	/* Get the default outbox FIFO depth */
 	priv->outbox_fifo_depth =
 		readl(priv->outbox_base + SPRD_MBOX_FIFO_DEPTH) + 1;
@@ -342,7 +409,9 @@ static int sprd_mbox_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id sprd_mbox_of_match[] = {
-	{ .compatible = "sprd,sc9860-mailbox", },
+	{ .compatible = "sprd,sc9860-mailbox" },
+	{ .compatible = "sprd,sc9863a-mailbox",
+	  .data = (void *)SPRD_SUPP_INBOX_ID_SC9863A },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, sprd_mbox_of_match);
diff --git a/drivers/mailbox/ti-msgmgr.c b/drivers/mailbox/ti-msgmgr.c
index 0130628f4d9d..efb43b038596 100644
--- a/drivers/mailbox/ti-msgmgr.c
+++ b/drivers/mailbox/ti-msgmgr.c
@@ -239,7 +239,7 @@ static irqreturn_t ti_msgmgr_queue_rx_interrupt(int irq, void *p)
 
 	/*
 	 * I have no idea about the protocol being used to communicate with the
-	 * remote producer - 0 could be valid data, so I wont make a judgement
+	 * remote producer - 0 could be valid data, so I won't make a judgement
 	 * of how many bytes I should be reading. Let the client figure this
 	 * out.. I just read the full message and pass it on..
 	 */