linux-kernel - [PATCH v2 1/2] dt-bindings: mailbox: Add devicetree binding for bcm74110 mbox

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Message-Id: <20250402223619.358818-2-justin.chen@broadcom.com>
Date: Wed,  2 Apr 2025 15:36:18 -0700
From: Justin Chen <justin.chen@...adcom.com>
To: devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: florian.fainelli@...adcom.com,
	conor+dt@...nel.org,
	krzk+dt@...nel.org,
	robh@...nel.org,
	jassisinghbrar@...il.com,
	bcm-kernel-feedback-list@...adcom.com,
	Justin Chen <justin.chen@...adcom.com>
Subject: [PATCH v2 1/2] dt-bindings: mailbox: Add devicetree binding for bcm74110 mbox

Add devicetree YAML binding for brcmstb bcm74110 mailbox used
for communicating with a co-processor.

Signed-off-by: Justin Chen <justin.chen@...adcom.com>
---
v2
        Renamed brcm,brcm_{tx|rx} to brcm,{tx|rx}.
        Removed brcm,shmem node. Not necessary to keep in dt.
        Fixed example and added scmi node.

 .../bindings/mailbox/brcm,bcm74110-mbox.yaml  | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml b/Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml
new file mode 100644
index 000000000000..8c3dfffa515f
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml
@@ -0,0 +1,70 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/brcm,bcm74110-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Broadcom BCM74110 Mailbox
+
+maintainers:
+  - Justin Chen <justin.chen@...adcom.com>
+  - Florian Fainelli <florian.fainelli@...adcom.com>
+
+description: Broadcom mailbox hardware first introduced with 74110
+
+properties:
+  compatible:
+    enum:
+      - brcm,bcm74110-mbox
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 2
+
+  "#mbox-cells":
+    const: 2
+    description:
+      The first cell is channel type and second cell is shared memory slot
+
+  brcm,tx:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Mailbox transmit doorbell
+
+  brcm,rx:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Mailbox receive doorbell
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#mbox-cells"
+  - brcm,tx
+  - brcm,rx
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    brcm_mailbox: brcm_mailbox@...2000 {
+        #mbox-cells = <0x2>;
+        brcm,rx = <0x7>;
+        brcm,tx = <0x6>;
+        compatible = "brcm,bcm74110-mbox";
+        reg = <0xa552000 0x1104>;
+        interrupts = <0x0 0x67 0x4>, /* DQM 7 */
+                     <0x0 0x66 0x4>; /* DQM 6 */
+    };
+
+    scmi {
+        compatible = "arm,scmi";
+        mboxes = <&brcm_mailbox 0x2 0x0>;
+        mbox-names = "tx";
+        shmem = <&PMCMBOX>;
+        #address-cells = <0x1>;
+        #size-cells = <0x0>;
+    };
-- 
2.34.1