linux-kernel - [PATCH v2 1/3] dt-bindings: mailbox: mediatek: Add apu-mailbox dt-bindings

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Message-ID: <20241230034446.1195728-2-karl.li@mediatek.com>
Date: Mon, 30 Dec 2024 11:43:35 +0800
From: Karl.Li <karl.li@...iatek.com>
To: Jassi Brar <jassisinghbrar@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Karl Li <Karl.Li@...iatek.com>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>,
	Chungying Lu <chungying.lu@...iatek.com>, Chien-Chih Tseng
	<Chien-Chih.Tseng@...iatek.com>, Andy Teng <Andy.Teng@...iatek.com>, Chen-Yu
 Tsai <wenst@...omium.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>, Karl Li
	<karl.li@...iatek.com>
Subject: [PATCH v2 1/3] dt-bindings: mailbox: mediatek: Add apu-mailbox dt-bindings

From: Karl Li <karl.li@...iatek.com>

Add devicetree binding for apu-mailbox.

MediaTek APU (AI Processing Unit) is a microcontroller unit
designed for AI acceleration tasks. The MediaTek APU-Mailbox
facilitates communication with the APU microcontroller.

Signed-off-by: Karl Li <karl.li@...iatek.com>
---
 .../mailbox/mediatek,apu-mailbox.yaml         | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml
new file mode 100644
index 000000000000..fdb0dec5fb78
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/mediatek,apu-mailbox.yaml
@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/mediatek,apu-mailbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek APU mailbox
+
+maintainers:
+  - Karl Li <Karl.Li@...iatek.com>
+
+description:
+  MediaTek APU (AI Processing Unit) is a microcontroller unit
+  designed for AI acceleration tasks. The MediaTek APU-Mailbox
+  facilitates communication with the APU microcontroller.
+  Within the MediaTek APU subsystem, a message passing mechanism is
+  built on top of the mailbox system. The mailbox only has limited
+  space for each message. The firmware expects the message header
+  from the mailbox, while the message body is passed through some
+  fixed shared memory.
+
+properties:
+  compatible:
+    const: mediatek,mt8196-apu-mailbox
+
+  "#mbox-cells":
+    const: 1
+    description:
+      The cell describe which channel the device will use.
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - "#mbox-cells"
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      mailbox@...00000 {
+        compatible = "mediatek,mt8196-apu-mailbox";
+        reg = <0 0x4c200000 0 0xfffff>;
+        interrupts = <GIC_SPI 638 IRQ_TYPE_LEVEL_HIGH 0>;
+        #mbox-cells = <1>;
+      };
+    };
-- 
2.18.0