linux-kernel - [PATCH v2 1/2] dt-bindings: mailbox: add cix,sky1-mbox

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Message-Id: <20250325101807.2202758-2-guomin.chen@cixtech.com>
Date: Tue, 25 Mar 2025 10:18:06 +0000
From: Guomin Chen <guomin.chen@...tech.com>
To: Jassi Brar <jassisinghbrar@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	cix-kernel-upstream@...tech.com,
	Guomin Chen <Guomin.Chen@...tech.com>,
	Peter Chen <peter.chen@...tech.com>,
	Lihua Liu <Lihua.Liu@...tech.com>
Subject: [PATCH v2 1/2] dt-bindings: mailbox: add cix,sky1-mbox

From: Guomin Chen <Guomin.Chen@...tech.com>

Add a dt-binding for the Cixtech Mailbox Controller.

Reviewed-by: Peter Chen <peter.chen@...tech.com>
Signed-off-by: Lihua Liu <Lihua.Liu@...tech.com>
Signed-off-by: Guomin Chen <Guomin.Chen@...tech.com>
---
 .../bindings/mailbox/cix,sky1-mbox.yaml       | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml b/Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
new file mode 100644
index 000000000000..98cee3bc0638
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/cix,sky1-mbox.yaml
@@ -0,0 +1,80 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/cix,sky1-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cixtech mailbox controller
+
+maintainers:
+  - Guomin Chen <Guomin.Chen@...tech.com>
+
+description:
+  The Cixtech mailbox controller, used in the Cixtech Sky1 SoC,
+  is used for message transmission between multiple processors
+  within the SoC, such as the AP, PM, audio DSP, SensorHub MCU,
+  and others
+
+  Each Cixtech mailbox controller is unidirectional, so they are
+  typically used in pairs-one for receiving and one for transmitting.
+
+  Each Cixtech mailbox supports 11 channels with different transmission modes
+    channel 0-7 - Fast channel with 32bit transmit register and IRQ support
+    channel 8   - Doorbell mode,using the mailbox as an interrupt-generating
+                   mechanism.
+    channel 9   - Fifo based channel with 32*32bit depth fifo and IRQ support
+    channel 10  - Reg based channel with 32*32bit transmit register and
+                   Doorbell+transmit acknowledgment IRQ support
+
+properties:
+  compatible:
+    const: cix,sky1-mbox
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#mbox-cells":
+    description: Common mailbox binding property to identify the number
+        of cells required for the mailbox specifier. Should be 1
+
+  cix,mbox-dir:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Direction of the mailbox (0:TX or 1:RX)
+    enum: [0, 1]
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#mbox-cells"
+  - cix,mbox-dir
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        mbox_ap2pm: mailbox@...00000 {
+            compatible = "cix,sky1-mbox";
+            reg = <0 0x30000000 0 0x10000>;
+            interrupts = <GIC_SPI 136 IRQ_TYPE_LEVEL_HIGH 0>;
+            #mbox-cells = <1>;
+            cix,mbox-dir = <0>; /* 0:tx; 1:rx */
+        };
+
+        mbox_pm2ap: mailbox@...10000 {
+            compatible = "cix,sky1-mbox";
+            reg = <0 0x30010000 0 0x10000>;
+            interrupts = <GIC_SPI 137 IRQ_TYPE_LEVEL_HIGH 0>;
+            #mbox-cells = <1>;
+            cix,mbox-dir = <1>; /* 0:tx; 1:rx */
+        };
+    };
-- 
2.34.1