dt-bindings: pinctrl: Add bindings for Awinic AW9523/AW9523B

Add bindings for the Awinic AW9523/AW9523B I2C GPIO Expander driver.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: David Bauer <mail@david-bauer.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210624214458.68716-1-mail@david-bauer.net
[Fixed up minor bugs found by new checking tools]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/awinic,aw9523-pinctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/awinic,aw9523-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Awinic AW9523/AW9523B I2C GPIO Expander
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
+
+description: |
+  The Awinic AW9523/AW9523B I2C GPIO Expander featuring 16 multi-function
+  I/O, 256 steps PWM mode and interrupt support.
+
+properties:
+  compatible:
+    const: awinic,aw9523-pinctrl
+
+  reg:
+    maxItems: 1
+
+  '#gpio-cells':
+    description: |
+      Specifying the pin number and flags, as defined in
+      include/dt-bindings/gpio/gpio.h
+    const: 2
+
+  gpio-controller: true
+
+  gpio-ranges:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  interrupts:
+    maxItems: 1
+    description: Specifies the INTN pin IRQ.
+
+  '#interrupt-cells':
+    description:
+      Specifies the PIN numbers and Flags, as defined in defined in
+      include/dt-bindings/interrupt-controller/irq.h
+    const: 2
+
+  reset-gpios:
+    maxItems: 1
+
+# PIN CONFIGURATION NODES
+patternProperties:
+  '-pins$':
+    type: object
+    description:
+      Pinctrl node's client devices use subnodes for desired pin configuration.
+      Client device subnodes use below standard properties.
+    $ref: /schemas/pinctrl/pincfg-node.yaml
+
+    properties:
+      pins:
+        description:
+          List of gpio pins affected by the properties specified in
+          this subnode.
+        items:
+          pattern: "^gpio([0-9]|1[0-5])$"
+        minItems: 1
+        maxItems: 16
+
+      function:
+        description:
+          Specify the alternative function to be configured for the
+          specified pins.
+
+        enum: [ gpio, pwm ]
+
+      bias-disable: true
+      bias-pull-down: true
+      bias-pull-up: true
+      drive-open-drain: true
+      drive-push-pull: true
+      input-enable: true
+      input-disable: true
+      output-high: true
+      output-low: true
+
+    required:
+      - pins
+      - function
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - gpio-controller
+  - '#gpio-cells'
+  - gpio-ranges
+
+additionalProperties: false
+
+examples:
+  # Example configuration to drive pins for a keyboard matrix
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        aw9523: gpio-expander@58 {
+                compatible = "awinic,aw9523-pinctrl";
+                reg = <0x58>;
+                interrupt-parent = <&tlmm>;
+                interrupts = <50 IRQ_TYPE_EDGE_FALLING>;
+                gpio-controller;
+                #gpio-cells = <2>;
+                gpio-ranges = <&tlmm 0 0 16>;
+                interrupt-controller;
+                #interrupt-cells = <2>;
+                reset-gpios = <&tlmm 51 GPIO_ACTIVE_HIGH>;
+
+                keyboard-matrix-col-pins {
+                        pins = "gpio8", "gpio9", "gpio10", "gpio11",
+                               "gpio12", "gpio13", "gpio14", "gpio15";
+                        function = "gpio";
+                        input-disable;
+                        output-low;
+                };
+
+                keyboard-matrix-row-pins {
+                        pins = "gpio0", "gpio1", "gpio2", "gpio3",
+                               "gpio4", "gpio5", "gpio6", "gpio7";
+                        function = "gpio";
+                        bias-pull-up;
+                        drive-open-drain;
+                        input-enable;
+                };
+        };
+    };