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

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Message-Id: <20250327221628.651042-3-justin.chen@broadcom.com>
Date: Thu, 27 Mar 2025 15:16:28 -0700
From: 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 2/2] dt-bindings: mailbox: Add devicetree binding for bcm74110 mbox

From: Justin Chen <justin.chen@...adcom.com>

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

Signed-off-by: Justin Chen <justin.chen@...adcom.com>
---
 .../bindings/mailbox/brcm,bcm74110-mbox.yaml  | 68 +++++++++++++++++++
 1 file changed, 68 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..139728a35303
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml
@@ -0,0 +1,68 @@
+# 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 Driver
+
+maintainers:
+  - Justin Chen <justin.chen@...adcom.com>
+  - Florian Fainelli <florian.fainelli@...adcom.com>
+
+description: Broadcom mailbox driver first introduced with 74110
+
+properties:
+  compatible:
+    enum:
+      - brcm,bcm74110-mbox
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#mbox-cells":
+    const: 2
+    description:
+      The first cell is channel type and second cell is shared memory slot
+
+  brcm,mbox_tx:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Mailbox transmit doorbell
+
+  brcm,mbox_rx:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Mailbox receive doorbell
+
+  brcm,mbox_shmem:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    maxItems: 2
+    description: Mailbox shared memory region and size
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#mbox-cells"
+  - brcm,mbox_tx
+  - brcm,mbox_rx
+  - brcm,mbox_shmem
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+        brcm_pmc_mailbox: brcm_pmc_mailbox@...2000 {
+                #mbox-cells = <2>;
+                compatible = "brcm,bcm74110-mbox";
+                reg = <0xa552000 0x1100>;
+                brcm,mbox_tx = <0x6>;
+                brcm,mbox_rx = <0x7>;
+                brcm,mbox_shmem = <0x3000 0x400>;
+                interrupts = <0x0 0x67 0x4>;
+                interrupt-parent = <&intc>;
+        };
-- 
2.34.1