[PATCH v2] dt-bindings: mediatek: add adsp-mbox document

[Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>]

This patch adds document for mediatek adsp mbox

Signed-off-by: Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>
---
 .../bindings/mailbox/mtk,adsp-mbox.yaml       | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/mtk,adsp-mbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/mtk,adsp-mbox.yaml b/Documentation/devicetree/bindings/mailbox/mtk,adsp-mbox.yaml
new file mode 100644
index 000000000000..9028e403ceda
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/mtk,adsp-mbox.yaml
@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/mtk,adsp-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek ADSP mailbox
+
+maintainers:
+  - Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>
+
+description: |
+  The MTK ADSP mailbox Inter-Processor Communication (IPC) enables the SoC
+  to ommunicate with ADSP by passing messages through two mailbox channels.
+  The MTK ADSP mailbox IPC also provides the ability for one processor to
+  signal the other processor using interrupts.
+
+  mbox0 is handling ipc reply
+  mbox1 is handling ipc request
+
+properties:
+  compatible:
+    items:
+      - const: mediatek,mt8195-adsp-mbox
+
+  "#mbox-cells":
+    const: 1
+
+  reg:
+    description: 
+      Physical address base for dsp mbox base registers.
+    maxItems: 2
+    minItems: 2
+
+  reg-names:
+    items:
+      - const: reg_mbox0 
+      - const: reg_mbox1
+
+  interrupts:
+    description: 
+      adsp mbox interrupt
+    maxItems: 2
+    minItems: 2
+
+  interrupt-names:
+    items:
+      - const: irq_mbox0 
+      - const: irq_mbox1
+
+required:
+  - compatible
+  - "#mbox-cells"
+  - reg
+  - reg-names
+  - interrupts
+  - interrupt-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    adsp_mailbox:adsp_mailbox@10816000 {
+        compatible = "mediatek,mt8195-adsp-mbox";
+        #mbox-cells = <1>;
+        reg = <0x10816000 0x1000>,
+              <0x10817000 0x1000>;
+        reg-names = "reg_mbox0", "reg_mbox1";
+        interrupts = <GIC_SPI 702 IRQ_TYPE_LEVEL_HIGH 0>,
+                     <GIC_SPI 703 IRQ_TYPE_LEVEL_HIGH 0>;
+        interrupt-names = "irq_mbox0", "irq_mbox1";
+    };
+
-- 
2.18.0