[PATCH 1/2] dt-bindings: arm: arm,juno-fpga-apb-regs: document FPGA syscon

[Krzysztof Kozlowski]

Add dedicated bindings for the FPGA syscon registers on ARM Juno board,
to fully document the block and also fix dtbs_check warning:

  juno.dtb: apbregs@10000: compatible: ['syscon', 'simple-mfd'] is too short

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>

---

Cc: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
---
 .../bindings/arm/arm,juno-fpga-apb-regs.yaml  | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/arm,juno-fpga-apb-regs.yaml

diff --git a/Documentation/devicetree/bindings/arm/arm,juno-fpga-apb-regs.yaml b/Documentation/devicetree/bindings/arm/arm,juno-fpga-apb-regs.yaml
new file mode 100644
index 000000000000..97a7a6281d62
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/arm,juno-fpga-apb-regs.yaml
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/arm,juno-fpga-apb-regs.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Juno FPGA APB Registers
+
+maintainers:
+  - Linus Walleij <linus.walleij@xxxxxxxxxx>
+
+properties:
+  compatible:
+    items:
+      - const: arm,juno-fpga-apb-regs
+      - const: syscon
+      - const: simple-mfd
+
+  reg:
+    maxItems: 1
+
+  ranges: true
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+patternProperties:
+  "^led@[0-9a-f]+,[0-9a-f]$":
+    $ref: /schemas/leds/register-bit-led.yaml#
+
+required:
+  - compatible
+  - reg
+  - ranges
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    syscon@10000 {
+        compatible = "arm,juno-fpga-apb-regs", "syscon", "simple-mfd";
+        reg = <0x010000 0x1000>;
+        ranges = <0x0 0x10000 0x1000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        led@8,0 {
+            compatible = "register-bit-led";
+            reg = <0x08 0x04>;
+            offset = <0x08>;
+            mask = <0x01>;
+            label = "vexpress:0";
+            linux,default-trigger = "heartbeat";
+            default-state = "on";
+        };
+    };
-- 
2.43.0