[PATCH RFC v1 2/3] dt-bindings: mailbox: Add thead,th1520-mailbox bindings

[Michal Wilczynski]

Add bindings for the mailbox controller. This work is based on the vendor
kernel. [1]

Link: https://github.com/revyos/thead-kernel.git [1]

Signed-off-by: Michal Wilczynski <m.wilczynski at samsung.com>
---
 .../bindings/mailbox/thead,th1520-mbox.yaml   | 83 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 84 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/thead,th1520-mbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/thead,th1520-mbox.yaml b/Documentation/devicetree/bindings/mailbox/thead,th1520-mbox.yaml
new file mode 100644
index 000000000000..f446fae76398
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/thead,th1520-mbox.yaml
@@ -0,0 +1,83 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/thead,th1520-mbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: T-head TH1520 Mailbox Controller
+
+description: |
+  The T-head mailbox controller enables two cores within the SoC to
+  communicate and coordinate by passing messages (e.g., data, status,
+  and control) through the mailbox channels. It also provides the ability
+  for one core to signal the other processor using interrupts.
+
+maintainers:
+  - Michal Wilczynski <m.wilczynski at samsung.com>
+
+properties:
+  compatible:
+    const: thead,th1520-mbox
+
+  reg:
+    description: Contains base addresses and sizes for the mailbox and remote ICUs.
+    items:
+      - description: Mailbox local base address
+      - description: Remote ICU 0 base address
+      - description: Remote ICU 1 base address
+      - description: Remote ICU 2 base address
+
+  reg-names:
+    items:
+      - const: local_base
+      - const: remote_icu0
+      - const: remote_icu1
+      - const: remote_icu2
+
+  interrupts:
+    maxItems: 1
+    description: Interrupt for the mailbox controller.
+
+  clocks:
+    maxItems: 1
+    description: Clock phandle for the mailbox controller.
+
+  clock-names:
+    items:
+      - const: ipg
+
+  icu_cpu_id:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: CPU ID for the ICU.
+
+  '#mbox-cells':
+    const: 2
+    description: Number of cells required to encode the mailbox specifier.
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - icu_cpu_id
+  - '#mbox-cells'
+
+dependencies:
+  clock-names: [ clocks ]
+
+examples:
+  - |
+    mbox_910t: mbox at ffffc38000 {
+      compatible = "thead,th1520-mbox";
+      reg = <0xff 0xffc38000 0x0 0x4000>,
+            <0xff 0xffc44000 0x0 0x1000>,
+            <0xff 0xffc4c000 0x0 0x1000>,
+            <0xff 0xffc54000 0x0 0x1000>;
+      reg-names = "local_base", "remote_icu0", "remote_icu1", "remote_icu2";
+      interrupts = <28 IRQ_TYPE_LEVEL_HIGH>;
+      icu_cpu_id = <0>;
+      #mbox-cells = <2>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 7331b30deef8..49198b2ed2e7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19719,6 +19719,7 @@ L:	linux-riscv at lists.infradead.org
 S:	Maintained
 T:	git https://github.com/pdp7/linux.git
 F:	Documentation/devicetree/bindings/clock/thead,th1520-clk-ap.yaml
+F:	Documentation/devicetree/bindings/mailbox/thead,th1520-mbox.yaml
 F:	arch/riscv/boot/dts/thead/
 F:	drivers/clk/thead/clk-th1520-ap.c
 F:	drivers/mailbox/mailbox-th1520.c
-- 
2.34.1