linux-kernel - [PATCH v1 1/2] dt-bindings: mailbox: Add MediaTek TinySYS MHU mailbox

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Message-ID: <20250623120127.109237-2-angelogioacchino.delregno@collabora.com>
Date: Mon, 23 Jun 2025 14:01:26 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: jassisinghbrar@...il.com
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	matthias.bgg@...il.com,
	angelogioacchino.delregno@...labora.com,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	kernel@...labora.com
Subject: [PATCH v1 1/2] dt-bindings: mailbox: Add MediaTek TinySYS MHU mailbox

Add a binding for the MediaTek TinySYS MHU mailbox, used for IPC
with the TinySYS hardware integrated in various MediaTek SoCs.

This mailbox handles a custom MHU enabling communication through
the TinySYS SCMI protocol.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 .../mediatek,mt6985-tinysys-mhu-mbox.yaml     | 52 +++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,mt6985-tinysys-mhu-mbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,mt6985-tinysys-mhu-mbox.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,mt6985-tinysys-mhu-mbox.yaml
new file mode 100644
index 000000000000..20fa5cb0ca0a
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/mediatek,mt6985-tinysys-mhu-mbox.yaml
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/mediatek,mt6985-tinysys-mhu-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek TinySYS MHU mailbox
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
+
+description:
+  This mailbox is used for Inter-Processor Communication (IPC) with the
+  TinySYS hardware integrated in various MediaTek SoCs and handles custom
+  Message Handling Unit (MHU) enabling communication through the TinySYS
+  SCMI protocol.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt6985-tinysys-mhu-mbox
+      - mediatek,mt6989-tinysys-mhu-mbox
+      - mediatek,mt8196-tinysys-mhu-mbox
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#mbox-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#mbox-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    tinysys_mbox0: mailbox@...51000 {
+        compatible = "mediatek,mt6985-tinysys-mhu-mbox";
+        reg = <0x1c351000 0x1000>;
+        interrupts = <GIC_SPI 341 IRQ_TYPE_LEVEL_HIGH 0>;
+        #mbox-cells = <0>;
+    };
-- 
2.49.0