[PATCH 06/11] dt-bindings: arm: convert vexpress-sysregs to DT schema

[Andre Przywara <andre.przywara@arm.com>]

The Arm Versatile Express system control register block provides GPIO
functionality to some devices and is also used for board identification.

Extract the first half of the informal vexpress-sysreg.txt binding and
make it proper DT schema compliant.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 .../bindings/arm/vexpress-sysreg.yaml         | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/vexpress-sysreg.yaml

diff --git a/Documentation/devicetree/bindings/arm/vexpress-sysreg.yaml b/Documentation/devicetree/bindings/arm/vexpress-sysreg.yaml
new file mode 100644
index 0000000000000..b5c03ebba6a6e
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/vexpress-sysreg.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/vexpress-sysreg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Versatile Express system registers bindings
+
+maintainers:
+  - Andre Przywara <andre.przywara@arm.com>
+
+description: |+
+  This is a system control registers block, providing multiple low level
+  platform functions like board detection and identification, software
+  interrupt generation, MMC and NOR Flash control etc.
+
+properties:
+  compatible:
+    const: arm,vexpress-sysreg
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  ranges: true
+
+additionalProperties: false
+
+patternProperties:
+  '^gpio@[0-9a-fA-F]+$':
+    type: object
+    description:
+      GPIO children
+
+    properties:
+      compatible:
+        enum:
+          - arm,vexpress-sysreg,sys_led
+          - arm,vexpress-sysreg,sys_mci
+          - arm,vexpress-sysreg,sys_flash
+
+      gpio-controller: true
+
+      "#gpio-cells":
+        const: 2
+        description: |
+          The first cell is the function number:
+          for sys_led : 0..7 = LED 0..7
+          for sys_mci : 0 = MMC CARDIN, 1 = MMC WPROT
+          for sys_flash : 0 = NOR FLASH WPn
+          The second cell can take standard GPIO flags.
+
+      reg:
+        maxItems: 1
+
+    required:
+      - compatible
+      - reg
+      - gpio-controller
+      - "#gpio-cells"
+
+required:
+  - compatible
+  - "#address-cells"
+  - "#size-cells"
+
+examples:
+  - |
+    sysreg@0 {
+            compatible = "arm,vexpress-sysreg";
+            reg = <0x00000 0x1000>;
+            #address-cells = <1>;
+            #size-cells = <1>;
+            ranges = <0 0 0x1000>;
+
+            v2m_led_gpios: gpio@8 {
+                    compatible = "arm,vexpress-sysreg,sys_led";
+                    reg = <0x008 4>;
+                    gpio-controller;
+                    #gpio-cells = <2>;
+            };
+    };
+
+...
-- 
2.25.1


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