dt-bindings: pinctrl: add loongson-2 pinctrl

Add the Loongson-2 pinctrl binding with DT schema format using
json-schema.
Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
Link: https://lore.kernel.org/r/20221114024942.8111-2-zhuyinbo@loongson.cnReviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/loongson,ls2k-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson-2 SoC Pinctrl Controller
+
+maintainers:
+  - zhanghongchen <zhanghongchen@loongson.cn>
+  - Yinbo Zhu <zhuyinbo@loongson.cn>
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+properties:
+  compatible:
+    const: loongson,ls2k-pinctrl
+
+  reg:
+    maxItems: 1
+
+patternProperties:
+  '-pins$':
+    type: object
+
+    additionalProperties: false
+
+    patternProperties:
+      'pinmux$':
+        type: object
+        description: node for pinctrl.
+        $ref: pinmux-node.yaml#
+
+        unevaluatedProperties: false
+
+        properties:
+          groups:
+            description:
+              One or more groups of pins to mux to a certain function
+            items:
+              enum: [gpio, sdio, can1, can0, pwm3, pwm2, pwm1, pwm0, i2c1, i2c0,
+                     nand, sata_led, i2s, hda]
+          function:
+            description:
+              The function that a group of pins is muxed to
+            enum: [gpio, sdio, can1, can0, pwm3, pwm2, pwm1, pwm0, i2c1, i2c0,
+                   nand, sata_led, i2s, hda]
+
+        required:
+          - groups
+          - function
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    pctrl: pinctrl@1fe00420 {
+        compatible = "loongson,ls2k-pinctrl";
+        reg = <0x1fe00420 0x18>;
+        sdio_pins_default: sdio-pins {
+            sdio-pinmux {
+                groups = "sdio";
+                function = "sdio";
+            };
+
+            sdio-det-pinmux {
+                groups = "pwm2";
+                function = "gpio";
+            };
+        };
+
+        pwm1_pins_default: pwm1-pins {
+            pinmux {
+                groups = "pwm1";
+                function = "pwm1";
+            };
+        };
+
+        pwm0_pins_default: pwm0-pins {
+            pinmux {
+                groups = "pwm0";
+                function = "pwm0";
+            };
+        };
+
+        i2c1_pins_default: i2c1-pins {
+            pinmux {
+                groups = "i2c1";
+                function = "i2c1";
+            };
+        };
+
+        i2c0_pins_default: i2c0-pins {
+            pinmux {
+                groups = "i2c0";
+                function = "i2c0";
+            };
+        };
+
+        nand_pins_default: nand-pins {
+            pinmux {
+                groups = "nand";
+                function = "nand";
+            };
+        };
+
+        hda_pins_default: hda-pins {
+            grp0-pinmux {
+                groups = "hda";
+                function = "hda";
+            };
+
+            grp1-pinmux {
+                groups = "i2s";
+                function = "gpio";
+            };
+        };
+    };

MAINTAINERS

@@ -12004,6 +12004,14 @@ F:	drivers/*/*loongarch*
 F:	Documentation/loongarch/
 F:	Documentation/translations/zh_CN/loongarch/
 
+LOONGSON-2 SOC SERIES PINCTRL DRIVER
+M:	zhanghongchen <zhanghongchen@loongson.cn>
+M:	Yinbo Zhu <zhuyinbo@loongson.cn>
+L:	linux-gpio@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
+F:	drivers/pinctrl/pinctrl-loongson2.c
+
 LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
 M:	Sathya Prakash <sathya.prakash@broadcom.com>
 M:	Sreekanth Reddy <sreekanth.reddy@broadcom.com>