dt-bindings: gpio: add loongson gpio

Add the Loongson platform gpio binding with DT schema format using
json-schema.
Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/gpio/loongson,ls-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson GPIO controller.
+
+maintainers:
+  - Yinbo Zhu <zhuyinbo@loongson.cn>
+
+properties:
+  compatible:
+    enum:
+      - loongson,ls2k-gpio
+      - loongson,ls7a-gpio
+
+  reg:
+    maxItems: 1
+
+  ngpios:
+    minimum: 1
+    maximum: 64
+
+  "#gpio-cells":
+    const: 2
+
+  gpio-controller: true
+
+  gpio-ranges: true
+
+  interrupts:
+    minItems: 1
+    maxItems: 64
+
+required:
+  - compatible
+  - reg
+  - ngpios
+  - "#gpio-cells"
+  - gpio-controller
+  - gpio-ranges
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    gpio0: gpio@1fe00500 {
+      compatible = "loongson,ls2k-gpio";
+      reg = <0x1fe00500 0x38>;
+      ngpios = <64>;
+      #gpio-cells = <2>;
+      gpio-controller;
+      gpio-ranges = <&pctrl 0 0 15>,
+                    <&pctrl 16 16 15>,
+                    <&pctrl 32 32 10>,
+                    <&pctrl 44 44 20>;
+      interrupt-parent = <&liointc1>;
+      interrupts = <28 IRQ_TYPE_LEVEL_LOW>,
+                   <29 IRQ_TYPE_LEVEL_LOW>,
+                   <30 IRQ_TYPE_LEVEL_LOW>,
+                   <30 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <26 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <>,
+                   <>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>,
+                   <27 IRQ_TYPE_LEVEL_LOW>;
+    };

MAINTAINERS

@@ -12116,6 +12116,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/pinctrl/loongson,ls2k-pinctrl.yaml
 F:	drivers/pinctrl/pinctrl-loongson2.c
 
+LOONGSON GPIO DRIVER
+M:	Yinbo Zhu <zhuyinbo@loongson.cn>
+L:	linux-gpio@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/gpio/loongson,ls-gpio.yaml
+
 LOONGSON-2 SOC SERIES CLOCK DRIVER
 M:	Yinbo Zhu <zhuyinbo@loongson.cn>
 L:	linux-clk@vger.kernel.org