[RFC PATCH 2/3] dt-bindings: gpio: Add binding documentation for Etron EJ168/EJ188/EJ198

[Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>]

Etron EJ168/EJ188/EJ198 are USB xHCI host controllers which embed a GPIO
controller.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
---
 .../devicetree/bindings/gpio/etron,ej1x8.yaml | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml

diff --git a/Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml b/Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml
new file mode 100644
index 000000000000..fa554045bdb5
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/etron,ej1x8.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/etron,ej1x8.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: GPIO controller embedded into the EJ168/EJ188/EJ198 xHCI controllers
+
+maintainers:
+  - Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
+
+properties:
+  compatible:
+    enum:
+      - pci1b6f,7023
+      - pci1b6f,7052
+
+  reg:
+    maxItems: 1
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-controller: true
+
+required:
+  - compatible
+  - reg
+  - "#gpio-cells"
+  - gpio-controller
+
+additionalProperties: false
+
+examples:
+  - |
+      pcie {
+        #address-cells = <3>;
+        #size-cells = <2>;
+
+        gpio@0,0,0 {
+          compatible = "pci1b6f,7023";
+          reg = <0x0 0x0 0x0 0x0 0x1000>;
+          gpio-controller;
+          #gpio-cells = <2>;
+        };
+      };
+
+...
-- 
2.28.0