[PATCH v9 2/2] dt-bindings: pinctrl: add loongson-2 pinctrl

[Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>]

Add the Loongson-2 pinctrl binding with DT schema format using
json-schema.

Signed-off-by: Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
---
Change in v9:
		1. NO change, but other patch in this series patches set has
		   change.
Change in v8:
		1. NO change, but other patch in this series patches set has
		   change.
Change in v7:
		1. Add all change log information. 
Change in v6:
		1. NO change, but other patch in this series patches set has
		   change.
Change in v5:
		1. Drop dependencies.
		2. Add spaces after '='.
		3. Replace string loongson2 with loongson-2 in title.
Change in v4:
		1. Replace Loongson2 with Loongson-2.
Change in v3:
		1. Drop the quotes in "pinctrl.yaml#".
		2. Remove the items in function node.
		3. Add requird node for "group" and "function" in properties.
Change in v2: 
                1. Add "$ref to pinctrl.yaml".
                2. Put required after patternProperties.
                3. Add "additionalProperties: false" after '-pins$'
                4. Add "unevaluatedProperties: false" after 'pinmux$'
                5. Fixup the broken indentation in patternProperties node.
                6. Use 4 spaces for example indentation. 

 .../pinctrl/loongson,ls2k-pinctrl.yaml        | 125 ++++++++++++++++++
 MAINTAINERS                                   |   1 +
 2 files changed, 126 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml

diff --git a/Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
new file mode 100644
index 000000000000..34683a4856ad
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
@@ -0,0 +1,125 @@
+# 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@xxxxxxxxxxx>
+  - Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
+
+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, lio, i2s, hda, uart2, uart1, camera, dv01,
+                     dvo0]
+          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, lio, i2s, hda, uart2, uart1, camera, dv01,
+                   dvo0]
+
+        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";
+            };
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index f75464dadaaa..c9dc5ddbd9fe 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12038,6 +12038,7 @@ M:	zhanghongchen <zhanghongchen@xxxxxxxxxxx>
 M:	Yinbo Zhu <zhuyinbo@xxxxxxxxxxx>
 L:	linux-gpio@xxxxxxxxxxxxxxx
 S:	Maintained
+F:	Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
 F:	drivers/pinctrl/pinctrl-loongson2.c
 
 LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
-- 
2.31.1