dt-bindings: pinctrl: mediatek: add support for mt8188

Add the pinctrl header file on MediaTek mt8188.
Add the new binding document for pinctrl on MediaTek mt8188.
Signed-off-by: Hui.Liu <hui.liu@mediatek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20220818075012.20880-2-hui.liu@mediatek.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/mediatek,mt8188-pinctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/mediatek,mt8188-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek MT8188 Pin Controller
+
+maintainers:
+  - Hui Liu <hui.liu@mediatek.com>
+
+description: |
+  The MediaTek's MT8188 Pin controller is used to control SoC pins.
+
+properties:
+  compatible:
+    const: mediatek,mt8188-pinctrl
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    description: |
+      Number of cells in GPIO specifier, should be two. The first cell
+      is the pin number, the second cell is used to specify optional
+      parameters which are defined in <dt-bindings/gpio/gpio.h>.
+    const: 2
+
+  gpio-ranges:
+    maxItems: 1
+
+  gpio-line-names: true
+
+  reg:
+    items:
+      - description: gpio registers base address
+      - description: rm group io configuration registers base address
+      - description: lt group io configuration registers base address
+      - description: lm group io configuration registers base address
+      - description: rt group io configuration registers base address
+      - description: eint registers base address
+
+  reg-names:
+    items:
+      - const: iocfg0
+      - const: iocfg_rm
+      - const: iocfg_lt
+      - const: iocfg_lm
+      - const: iocfg_rt
+      - const: eint
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 2
+
+  interrupts:
+    description: The interrupt outputs to sysirq.
+    maxItems: 1
+
+  mediatek,rsel-resistance-in-si-unit:
+    type: boolean
+    description: |
+      We provide two methods to select the resistance for I2C when pull up or pull down.
+      The first is by RSEL definition value, another one is by resistance value(ohm).
+      This flag is used to identify if the method is resistance(si unit) value.
+
+# PIN CONFIGURATION NODES
+patternProperties:
+  '-pins$':
+    type: object
+    additionalProperties: false
+
+    patternProperties:
+      '^pins':
+        type: object
+        $ref: "/schemas/pinctrl/pincfg-node.yaml"
+        additionalProperties: false
+        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, pullups, drive strength, input enable/disable and
+          input schmitt.
+
+        properties:
+          pinmux:
+            description: |
+              Integer array, represents gpio pin number and mux setting.
+              Supported pin number and mux varies for different SoCs, and are
+              defined as macros in dt-bindings/pinctrl/mediatek,<soc>-pinfunc.h
+              directly.
+
+          drive-strength:
+            enum: [2, 4, 6, 8, 10, 12, 14, 16]
+
+          drive-strength-microamp:
+            enum: [125, 250, 500, 1000]
+
+          bias-pull-down:
+            oneOf:
+              - type: boolean
+              - enum: [100, 101, 102, 103]
+                description: mt8188 pull down PUPD/R0/R1 type define value.
+              - enum: [200, 201, 202, 203, 204, 205, 206, 207]
+                description: mt8188 pull down RSEL type define value.
+              - enum: [75000, 5000]
+                description: mt8188 pull down RSEL type si unit value(ohm).
+            description: |
+              For pull down type is normal, it doesn't need add RSEL & R1R0 define
+              and resistance value.
+              For pull down type is PUPD/R0/R1 type, it can add R1R0 define to
+              set different resistance. It can support "MTK_PUPD_SET_R1R0_00" &
+              "MTK_PUPD_SET_R1R0_01" & "MTK_PUPD_SET_R1R0_10" & "MTK_PUPD_SET_R1R0_11"
+              define in mt8188.
+              For pull down type is RSEL, it can add RSEL define & resistance value(ohm)
+              to set different resistance by identifying property "mediatek,rsel-resistance-in-si-unit".
+              It can support "MTK_PULL_SET_RSEL_000" & "MTK_PULL_SET_RSEL_001"
+              & "MTK_PULL_SET_RSEL_010" & "MTK_PULL_SET_RSEL_011" & "MTK_PULL_SET_RSEL_100"
+              & "MTK_PULL_SET_RSEL_101" & "MTK_PULL_SET_RSEL_110" & "MTK_PULL_SET_RSEL_111"
+              define in mt8188. It can also support resistance value(ohm) "75000" & "5000" in mt8188.
+
+          bias-pull-up:
+            oneOf:
+              - type: boolean
+              - enum: [100, 101, 102, 103]
+                description: mt8188 pull up PUPD/R0/R1 type define value.
+              - enum: [200, 201, 202, 203, 204, 205, 206, 207]
+                description: mt8188 pull up RSEL type define value.
+              - enum: [1000, 1500, 2000, 3000, 4000, 5000, 10000, 75000]
+                description: mt8188 pull up RSEL type si unit value(ohm).
+            description: |
+              For pull up type is normal, it don't need add RSEL & R1R0 define
+              and resistance value.
+              For pull up type is PUPD/R0/R1 type, it can add R1R0 define to
+              set different resistance. It can support "MTK_PUPD_SET_R1R0_00" &
+              "MTK_PUPD_SET_R1R0_01" & "MTK_PUPD_SET_R1R0_10" & "MTK_PUPD_SET_R1R0_11"
+              define in mt8188.
+              For pull up type is RSEL, it can add RSEL define & resistance value(ohm)
+              to set different resistance by identifying property "mediatek,rsel-resistance-in-si-unit".
+              It can support "MTK_PULL_SET_RSEL_000" & "MTK_PULL_SET_RSEL_001"
+              & "MTK_PULL_SET_RSEL_010" & "MTK_PULL_SET_RSEL_011" & "MTK_PULL_SET_RSEL_100"
+              & "MTK_PULL_SET_RSEL_101" & "MTK_PULL_SET_RSEL_110" & "MTK_PULL_SET_RSEL_111"
+              define in mt8188. It can also support resistance value(ohm)
+              "1000" & "1500" & "2000" & "3000" & "4000" & "5000" & "10000" & "75000" in mt8188.
+
+          bias-disable: true
+
+          output-high: true
+
+          output-low: true
+
+          input-enable: true
+
+          input-disable: true
+
+          input-schmitt-enable: true
+
+          input-schmitt-disable: true
+
+        required:
+          - pinmux
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-controller
+  - '#interrupt-cells'
+  - gpio-controller
+  - '#gpio-cells'
+  - gpio-ranges
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/pinctrl/mediatek,mt8188-pinfunc.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    pio: pinctrl@10005000 {
+        compatible = "mediatek,mt8188-pinctrl";
+        reg = <0x10005000 0x1000>,
+              <0x11c00000 0x1000>,
+              <0x11e10000 0x1000>,
+              <0x11e20000 0x1000>,
+              <0x11ea0000 0x1000>,
+              <0x1000b000 0x1000>;
+        reg-names = "iocfg0", "iocfg_rm",
+                    "iocfg_lt", "iocfg_lm", "iocfg_rt",
+                    "eint";
+        gpio-controller;
+        #gpio-cells = <2>;
+        gpio-ranges = <&pio 0 0 176>;
+        interrupt-controller;
+        interrupts = <GIC_SPI 225 IRQ_TYPE_LEVEL_HIGH 0>;
+        #interrupt-cells = <2>;
+
+        pio-pins {
+            pins {
+                pinmux = <PINMUX_GPIO0__FUNC_B_GPIO0>;
+                output-low;
+            };
+        };
+
+        spi0-pins {
+            pins-spi {
+                pinmux = <PINMUX_GPIO75__FUNC_O_SPIM1_CSB>,
+                         <PINMUX_GPIO76__FUNC_O_SPIM1_CLK>,
+                         <PINMUX_GPIO77__FUNC_B0_SPIM1_MOSI>;
+                drive-strength = <6>;
+            };
+            pins-spi-mi {
+                pinmux = <PINMUX_GPIO78__FUNC_B0_SPIM1_MISO>;
+                bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
+            };
+        };
+
+        i2c0-pins {
+            pins {
+                pinmux = <PINMUX_GPIO55__FUNC_B1_SCL0>,
+                         <PINMUX_GPIO56__FUNC_B1_SDA0>;
+                bias-disable;
+                drive-strength-microamp = <1000>;
+            };
+        };
+    };