dt-bindings: pinctrl: Add StarFive JH7110 sys pinctrl

Add pinctrl bindings for StarFive JH7110 SoC sys pinctrl controller.

Signed-off-by: Jianlong Huang <jianlong.huang@starfivetech.com>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>

diff --git a/Documentation/devicetree/bindings/pinctrl/starfive,jh7110-sys-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/starfive,jh7110-sys-pinctrl.yaml
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+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/starfive,jh7110-sys-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: StarFive JH7110 Sys Pin Controller
+
+description: |
+  Bindings for the JH7110 RISC-V SoC from StarFive Technology Ltd.
+
+  Out of the SoC's many pins only the ones named PAD_GPIO0 to PAD_GPIO63
+  can be multiplexed and have configurable bias, drive strength,
+  schmitt trigger etc.
+  Some peripherals have their I/O go through the 64 "GPIOs". This also
+  includes a number of other UARTs, I2Cs, SPIs, PWMs etc.
+  All these peripherals are connected to all 64 GPIOs such that
+  any GPIO can be set up to be controlled by any of the peripherals.
+
+maintainers:
+  - Jianlong Huang <jianlong.huang@starfivetech.com>
+
+properties:
+  compatible:
+    const: starfive,jh7110-sys-pinctrl
+
+  reg:
+    maxItems: 1
+
+  reg-names:
+    items:
+      - const: control
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+
+  interrupts:
+    maxItems: 1
+    description: The GPIO parent interrupt.
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - gpio-controller
+  - "#gpio-cells"
+  - interrupts
+  - interrupt-controller
+  - "#interrupt-cells"
+
+patternProperties:
+  '-[0-9]+$':
+    type: object
+    patternProperties:
+      '-pins$':
+        type: object
+        description: |
+          A pinctrl node should contain at least one subnode representing the
+          pinctrl groups available on the machine. Each subnode will list the
+          pins it needs, and how they should be configured, with regard to
+          muxer configuration, system signal configuration, pin groups for
+          vin/vout module, pin voltage, mux functions for output, mux functions
+          for output enable, mux functions for input.
+
+        properties:
+          pinmux:
+            description: |
+              The list of GPIOs and their mux settings that properties in the
+              node apply to. This should be set using the GPIOMUX macro.
+            $ref: "/schemas/pinctrl/pinmux-node.yaml#/properties/pinmux"
+
+          bias-disable: true
+
+          bias-pull-up:
+            type: boolean
+
+          bias-pull-down:
+            type: boolean
+
+          drive-strength:
+            enum: [ 2, 4, 8, 12 ]
+
+          input-enable: true
+
+          input-disable: true
+
+          input-schmitt-enable: true
+
+          input-schmitt-disable: true
+
+          slew-rate:
+            maximum: 1
+
+        additionalProperties: false
+
+    additionalProperties: false
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/starfive-jh7110.h>
+    #include <dt-bindings/reset/starfive-jh7110.h>
+    #include <dt-bindings/pinctrl/pinctrl-starfive-jh7110.h>
+
+        soc {
+                #address-cells = <2>;
+                #size-cells = <2>;
+
+                gpio: gpio@13040000 {
+                        compatible = "starfive,jh7110-sys-pinctrl";
+                        reg = <0x0 0x13040000 0x0 0x10000>;
+                        reg-names = "control";
+                        clocks = <&syscrg_clk JH7110_SYSCLK_IOMUX>;
+                        resets = <&syscrg_rst JH7110_SYSRST_IOMUX>;
+                        interrupts = <86>;
+                        interrupt-controller;
+                        #interrupt-cells = <2>;
+                        #gpio-cells = <2>;
+                        gpio-controller;
+                        status = "okay";
+
+                        uart0_pins: uart0-0 {
+                                tx-pins {
+                                        pinmux = <GPIOMUX(5, GPOUT_SYS_UART0_TX, GPOEN_ENABLE, GPI_NONE)>;
+                                        bias-disable;
+                                        drive-strength = <12>;
+                                        input-disable;
+                                        input-schmitt-disable;
+                                        slew-rate = <0>;
+                                };
+
+                                rx-pins {
+                                        pinmux = <GPIOMUX(6, GPOUT_LOW, GPOEN_DISABLE, GPI_SYS_UART0_RX)>;
+                                        bias-pull-up;
+                                        drive-strength = <2>;
+                                        input-enable;
+                                        input-schmitt-enable;
+                                        slew-rate = <0>;
+                                };
+                        };
+                };
+
+                uart0 {
+                        pinctrl-names = "default";
+                        pinctrl-0 = <&uart0_pins>;
+                        status = "okay";
+                };
+        };
+
+...