diff --git a/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt b/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
index 5fe80c1c19fc..12371f5c6cd9 100644
--- a/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
+++ b/Documentation/devicetree/bindings/mailbox/omap-mailbox.txt
@@ -28,6 +28,9 @@ SoCs has each of these instances form a cluster and combine multiple clusters
 into a single IP block present within the Main NavSS. The interrupt lines from
 all these clusters are multiplexed and routed to different processor subsystems
 over a limited number of common interrupt output lines of an Interrupt Router.
+The AM64x SoCS also uses a single IP block comprising of multiple clusters,
+but the number of clusters are smaller, and the interrupt output lines are
+connected directly to various processors.
 
 Mailbox Device Node:
 ====================
@@ -42,6 +45,7 @@ Required properties:
 			    "ti,omap4-mailbox" for OMAP44xx, OMAP54xx, AM33xx,
 						   AM43xx and DRA7xx SoCs
 			    "ti,am654-mailbox" for K3 AM65x and J721E SoCs
+			    "ti,am64-mailbox" for K3 AM64x SoCs
 - reg:			Contains the mailbox register address range (base
 			address and length)
 - interrupts:		Contains the interrupt information for the mailbox
diff --git a/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml
index ffd09b664ff5..5dc1173d03fd 100644
--- a/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml
+++ b/Documentation/devicetree/bindings/mailbox/qcom,apcs-kpss-global.yaml
@@ -24,6 +24,7 @@ properties:
       - qcom,msm8998-apcs-hmss-global
       - qcom,qcs404-apcs-apps-global
       - qcom,sc7180-apss-shared
+      - qcom,sc8180x-apss-shared
       - qcom,sdm660-apcs-hmss-global
       - qcom,sdm845-apss-shared
       - qcom,sm8150-apss-shared
@@ -33,9 +34,11 @@ properties:
 
   clocks:
     description: phandles to the parent clocks of the clock driver
+    minItems: 2
     items:
       - description: primary pll parent of the clock driver
       - description: auxiliary parent
+      - description: reference clock
 
   '#mbox-cells':
     const: 1
@@ -44,9 +47,11 @@ properties:
     const: 0
 
   clock-names:
+    minItems: 2
     items:
       - const: pll
       - const: aux
+      - const: ref
 
 required:
   - compatible
@@ -55,6 +60,35 @@ required:
 
 additionalProperties: false
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          enum:
+            - qcom,ipq6018-apcs-apps-global
+            - qcom,ipq8074-apcs-apps-global
+            - qcom,msm8916-apcs-kpss-global
+            - qcom,msm8994-apcs-kpss-global
+            - qcom,msm8996-apcs-hmss-global
+            - qcom,msm8998-apcs-hmss-global
+            - qcom,qcs404-apcs-apps-global
+            - qcom,sc7180-apss-shared
+            - qcom,sdm660-apcs-hmss-global
+            - qcom,sdm845-apss-shared
+            - qcom,sm8150-apss-shared
+    then:
+      properties:
+        clocks:
+          maxItems: 2
+  - if:
+      properties:
+        compatible:
+          enum:
+            - qcom,sdx55-apcs-gcc
+    then:
+      properties:
+        clocks:
+          maxItems: 3
 examples:
 
   # Example apcs with msm8996
diff --git a/drivers/mailbox/arm_mhuv2.c b/drivers/mailbox/arm_mhuv2.c
index 6cf1991a5c9c..d997f8ebfa98 100644
--- a/drivers/mailbox/arm_mhuv2.c
+++ b/drivers/mailbox/arm_mhuv2.c
@@ -238,19 +238,19 @@ struct mhuv2_mbox_chan_priv {
 };
 
 /* Macro for reading a bitfield within a physically mapped packed struct */
-#define readl_relaxed_bitfield(_regptr, _field)				\
+#define readl_relaxed_bitfield(_regptr, _type, _field)			\
 	({								\
 		u32 _regval;						\
 		_regval = readl_relaxed((_regptr));			\
-		(*(typeof((_regptr)))(&_regval))._field;		\
+		(*(_type *)(&_regval))._field;				\
 	})
 
 /* Macro for writing a bitfield within a physically mapped packed struct */
-#define writel_relaxed_bitfield(_value, _regptr, _field)		\
+#define writel_relaxed_bitfield(_value, _regptr, _type, _field)		\
 	({								\
 		u32 _regval;						\
 		_regval = readl_relaxed(_regptr);			\
-		(*(typeof(_regptr))(&_regval))._field = _value;		\
+		(*(_type *)(&_regval))._field = _value;			\
 		writel_relaxed(_regval, _regptr);			\
 	})
 
@@ -496,7 +496,7 @@ static const struct mhuv2_protocol_ops mhuv2_data_transfer_ops = {
 
 /* Interrupt handlers */
 
-static struct mbox_chan *get_irq_chan_comb(struct mhuv2 *mhu, u32 *reg)
+static struct mbox_chan *get_irq_chan_comb(struct mhuv2 *mhu, u32 __iomem *reg)
 {
 	struct mbox_chan *chans = mhu->mbox.chans;
 	int channel = 0, i, offset = 0, windows, protocol, ch_wn;
@@ -699,7 +699,9 @@ static irqreturn_t mhuv2_receiver_interrupt(int irq, void *arg)
 		ret = IRQ_HANDLED;
 	}
 
-	kfree(data);
+	if (!IS_ERR(data))
+		kfree(data);
+
 	return ret;
 }
 
@@ -969,8 +971,8 @@ static int mhuv2_tx_init(struct amba_device *adev, struct mhuv2 *mhu,
 	mhu->mbox.ops = &mhuv2_sender_ops;
 	mhu->send = reg;
 
-	mhu->windows = readl_relaxed_bitfield(&mhu->send->mhu_cfg, num_ch);
-	mhu->minor = readl_relaxed_bitfield(&mhu->send->aidr, arch_minor_rev);
+	mhu->windows = readl_relaxed_bitfield(&mhu->send->mhu_cfg, struct mhu_cfg_t, num_ch);
+	mhu->minor = readl_relaxed_bitfield(&mhu->send->aidr, struct aidr_t, arch_minor_rev);
 
 	spin_lock_init(&mhu->doorbell_pending_lock);
 
@@ -990,7 +992,7 @@ static int mhuv2_tx_init(struct amba_device *adev, struct mhuv2 *mhu,
 			mhu->mbox.txdone_poll = false;
 			mhu->irq = adev->irq[0];
 
-			writel_relaxed_bitfield(1, &mhu->send->int_en, chcomb);
+			writel_relaxed_bitfield(1, &mhu->send->int_en, struct int_en_t, chcomb);
 
 			/* Disable all channel interrupts */
 			for (i = 0; i < mhu->windows; i++)
@@ -1023,8 +1025,8 @@ static int mhuv2_rx_init(struct amba_device *adev, struct mhuv2 *mhu,
 	mhu->mbox.ops = &mhuv2_receiver_ops;
 	mhu->recv = reg;
 
-	mhu->windows = readl_relaxed_bitfield(&mhu->recv->mhu_cfg, num_ch);
-	mhu->minor = readl_relaxed_bitfield(&mhu->recv->aidr, arch_minor_rev);
+	mhu->windows = readl_relaxed_bitfield(&mhu->recv->mhu_cfg, struct mhu_cfg_t, num_ch);
+	mhu->minor = readl_relaxed_bitfield(&mhu->recv->aidr, struct aidr_t, arch_minor_rev);
 
 	mhu->irq = adev->irq[0];
 	if (!mhu->irq) {
@@ -1045,7 +1047,7 @@ static int mhuv2_rx_init(struct amba_device *adev, struct mhuv2 *mhu,
 		writel_relaxed(0xFFFFFFFF, &mhu->recv->ch_wn[i].mask_set);
 
 	if (mhu->minor)
-		writel_relaxed_bitfield(1, &mhu->recv->int_en, chcomb);
+		writel_relaxed_bitfield(1, &mhu->recv->int_en, struct int_en_t, chcomb);
 
 	return 0;
 }
diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
index 93fe08aef3ca..7295e3835e30 100644
--- a/drivers/mailbox/omap-mailbox.c
+++ b/drivers/mailbox/omap-mailbox.c
@@ -3,7 +3,7 @@
  * OMAP mailbox driver
  *
  * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
- * Copyright (C) 2013-2019 Texas Instruments Incorporated - https://www.ti.com
+ * Copyright (C) 2013-2021 Texas Instruments Incorporated - https://www.ti.com
  *
  * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
  *          Suman Anna <s-anna@ti.com>
@@ -663,6 +663,10 @@ static const struct of_device_id omap_mailbox_of_match[] = {
 		.compatible	= "ti,am654-mailbox",
 		.data		= &omap4_data,
 	},
+	{
+		.compatible	= "ti,am64-mailbox",
+		.data		= &omap4_data,
+	},
 	{
 		/* end */
 	},
diff --git a/drivers/mailbox/qcom-apcs-ipc-mailbox.c b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
index 077e5c6a9ef7..f25324d03842 100644
--- a/drivers/mailbox/qcom-apcs-ipc-mailbox.c
+++ b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
@@ -61,11 +61,15 @@ static const struct qcom_apcs_ipc_data apps_shared_apcs_data = {
 	.offset = 12, .clk_name = NULL
 };
 
+static const struct qcom_apcs_ipc_data sdx55_apcs_data = {
+	.offset = 0x1008, .clk_name = "qcom-sdx55-acps-clk"
+};
+
 static const struct regmap_config apcs_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
-	.max_register = 0xFFC,
+	.max_register = 0x1008,
 	.fast_io = true,
 };
 
@@ -159,9 +163,11 @@ static const struct of_device_id qcom_apcs_ipc_of_match[] = {
 	{ .compatible = "qcom,msm8998-apcs-hmss-global", .data = &msm8998_apcs_data },
 	{ .compatible = "qcom,qcs404-apcs-apps-global", .data = &msm8916_apcs_data },
 	{ .compatible = "qcom,sc7180-apss-shared", .data = &apps_shared_apcs_data },
+	{ .compatible = "qcom,sc8180x-apss-shared", .data = &apps_shared_apcs_data },
 	{ .compatible = "qcom,sdm660-apcs-hmss-global", .data = &sdm660_apcs_data },
 	{ .compatible = "qcom,sdm845-apss-shared", .data = &apps_shared_apcs_data },
 	{ .compatible = "qcom,sm8150-apss-shared", .data = &apps_shared_apcs_data },
+	{ .compatible = "qcom,sdx55-apcs-gcc", .data = &sdx55_apcs_data },
 	{}
 };
 MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
diff --git a/drivers/mailbox/sprd-mailbox.c b/drivers/mailbox/sprd-mailbox.c
index f6fab24ae8a9..4c325301a2fe 100644
--- a/drivers/mailbox/sprd-mailbox.c
+++ b/drivers/mailbox/sprd-mailbox.c
@@ -35,7 +35,7 @@
 #define SPRD_MBOX_IRQ_CLR			BIT(0)
 
 /* Bit and mask definiation for outbox's SPRD_MBOX_FIFO_STS register */
-#define SPRD_OUTBOX_FIFO_FULL			BIT(0)
+#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)
diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index e07091d71986..acd0675da681 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -98,7 +98,9 @@ struct tegra_hsp {
 	unsigned int num_ss;
 	unsigned int num_db;
 	unsigned int num_si;
+
 	spinlock_t lock;
+	struct lock_class_key lock_key;
 
 	struct list_head doorbells;
 	struct tegra_hsp_mailbox *mailboxes;
@@ -775,6 +777,18 @@ static int tegra_hsp_probe(struct platform_device *pdev)
 			return err;
 	}
 
+	lockdep_register_key(&hsp->lock_key);
+	lockdep_set_class(&hsp->lock, &hsp->lock_key);
+
+	return 0;
+}
+
+static int tegra_hsp_remove(struct platform_device *pdev)
+{
+	struct tegra_hsp *hsp = platform_get_drvdata(pdev);
+
+	lockdep_unregister_key(&hsp->lock_key);
+
 	return 0;
 }
 
@@ -834,6 +848,7 @@ static struct platform_driver tegra_hsp_driver = {
 		.pm = &tegra_hsp_pm_ops,
 	},
 	.probe = tegra_hsp_probe,
+	.remove = tegra_hsp_remove,
 };
 
 static int __init tegra_hsp_init(void)