[PATCH 1/7] dt-bindings: mailbox: add Allwinner sun55i msgbox schema

[Tim Michals <tcmichals@gmail.com>]

Add Device Tree binding schema for the Allwinner 4-port hardware
Message Box controller found on sun55i (A523, A527, T527) and
sun60i (A733) SoCs.

The message box connects the ARM Cortex-A55 host cluster to the
HiFi4 Audio DSP, Power Management Unit (CPUS), and XuanTie RISC-V
co-processor across 12 logical channels with 8-entry hardware FIFOs.

Cc: Jassi Brar <jaswinder.singh@linaro.org>
Cc: Samuel Holland <samuel@sholland.org>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Krzysztof Kozlowski <krzk+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-sunxi@lists.linux.dev
Signed-off-by: Tim Michals <tcmichals@gmail.com>
---
 .../mailbox/allwinner,sun55i-a523-msgbox.yaml | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mailbox/allwinner,sun55i-a523-msgbox.yaml

diff --git a/Documentation/devicetree/bindings/mailbox/allwinner,sun55i-a523-msgbox.yaml b/Documentation/devicetree/bindings/mailbox/allwinner,sun55i-a523-msgbox.yaml
new file mode 100644
index 000000000000..4b73543c7902
--- /dev/null
+++ b/Documentation/devicetree/bindings/mailbox/allwinner,sun55i-a523-msgbox.yaml
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mailbox/allwinner,sun55i-a523-msgbox.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner sun55i 4-Port Message Box
+
+maintainers:
+  - Tim Michals <tcmichals@gmail.com>
+  - Samuel Holland <samuel@sholland.org>
+
+description: |
+  The hardware message box on sun55i (A523, A527, T527) and sun60i (A733)
+  SoCs is a 4-port multi-processor mailbox controller connecting the ARM
+  Cortex-A55 host cluster, HiFi4 Audio DSP, Power Management Unit (CPUS),
+  and XuanTie RISC-V co-processor.
+
+  It features independent 256-byte register banks for each processor port,
+  12 logical channels on the host (4 per remote processor), and 8-entry
+  hardware FIFOs with level interrupts.
+
+properties:
+  compatible:
+    enum:
+      - allwinner,sun55i-a523-msgbox
+      - allwinner,sun55i-t527-msgbox
+      - allwinner,sun60i-a733-msgbox
+
+  reg:
+    minItems: 4
+    maxItems: 4
+    description: |
+      Register banks for each of the four processor ports. Each port has
+      an independent 256-byte register bank.
+
+  reg-names:
+    items:
+      - const: arm
+      - const: dsp
+      - const: cpus
+      - const: rv
+
+  clocks:
+    maxItems: 1
+    description: bus clock
+
+  resets:
+    maxItems: 1
+    description: bus reset
+
+  interrupts:
+    minItems: 1
+    maxItems: 4
+    description: |
+      One interrupt per processor port. The host port interrupt is required;
+      remote port interrupts are optional.
+
+  '#mbox-cells':
+    const: 1
+    description: "channel number (0-11: 0-3 CPUS, 4-7 DSP, 8-11 RISC-V)"
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - resets
+  - interrupts
+  - '#mbox-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    mailbox@3003000 {
+        compatible = "allwinner,sun55i-a523-msgbox";
+        reg = <0x03003000 0x1000>,
+              <0x07094000 0x1000>,
+              <0x07120000 0x1000>,
+              <0x07136000 0x1000>;
+        reg-names = "arm", "dsp", "cpus", "rv";
+        clocks = <&ccu 120>;
+        resets = <&ccu 45>;
+        interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 181 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 174 IRQ_TYPE_LEVEL_HIGH>;
+        #mbox-cells = <1>;
+    };
+
-- 
2.53.0