dt-bindings: pinctrl: Add cix,sky1-pinctrl

The pin-controller is used to control the Soc pins.
There are two pin-controllers on Cix Sky1 platform.
One is used under S0 state, the other is used under
S0 and S5 state.

Signed-off-by: Gary Yang <gary.yang@cixtech.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/cix,sky1-pinctrl.yaml

@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/cix,sky1-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Cix Sky1 Soc Pin Controller
+
+maintainers:
+  - Gary Yang <gary.yang@cixtech.com>
+
+description:
+  The pin-controller is used to control Soc pins. There are two pin-controllers
+  on Cix Sky1 platform. one is used under S0 state, the other one is used under
+  S0 and S5 state.
+
+properties:
+  compatible:
+    enum:
+      - cix,sky1-pinctrl
+      - cix,sky1-pinctrl-s5
+
+  reg:
+    items:
+      - description: gpio base
+
+patternProperties:
+  '-cfg$':
+    type: object
+    additionalProperties: false
+
+    description:
+      A pinctrl node should contain at least one subnode representing the
+      pinctrl groups available on the machine.
+
+    patternProperties:
+      'pins$':
+        type: object
+        additionalProperties: false
+
+        description:
+          Each subnode will list the pins it needs, and how they should
+          be configured, with regard to muxer configuration, bias pull,
+          and drive strength.
+
+        allOf:
+          - $ref: pincfg-node.yaml#
+          - $ref: pinmux-node.yaml#
+
+        properties:
+          pinmux:
+            description:
+              Values are constructed from pin number and mux setting, pin
+              number is left shifted by 8 bits, then ORed with mux setting
+
+          bias-disable: true
+
+          bias-pull-up: true
+
+          bias-pull-down: true
+
+          drive-strength:
+            description:
+              typical current when output high level.
+            enum: [ 2, 3, 5, 6, 8, 9, 11, 12, 13, 14, 17, 18, 20, 21, 23,
+                    24 ]
+
+
+        required:
+          - pinmux
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #define CIX_PAD_GPIO012_FUNC_GPIO012 (11 << 8 | 0x0)
+    pinctrl@4170000 {
+        compatible = "cix,sky1-pinctrl";
+        reg = <0x4170000 0x1000>;
+
+        wifi_vbat_gpio: wifi-vbat-gpio-cfg {
+            pins {
+                pinmux = <CIX_PAD_GPIO012_FUNC_GPIO012>;
+                bias-pull-up;
+                drive-strength = <8>;
+           };
+        };
+    };