dt-bindings: pinctrl: Add MediaTek MT6795 pinctrl bindings

Add devicetree and pinfunc bindings for MediaTek Helio X10 MT6795.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220517083957.11816-2-angelogioacchino.delregno@collabora.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: AngeloGioacchino Del Regno

Documentation/devicetree/bindings/pinctrl/mediatek,pinctrl-mt6795.yaml

@@ -0,0 +1,224 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/mediatek,pinctrl-mt6795.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek MT6795 Pin Controller
+
+maintainers:
+  - AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
+  - Sean Wang <sean.wang@kernel.org>
+
+description: |
+  The Mediatek's Pin controller is used to control SoC pins.
+
+properties:
+  compatible:
+    const: mediatek,mt6795-pinctrl
+
+  gpio-controller: true
+
+  '#gpio-cells':
+    description: |
+      Number of cells in GPIO specifier. Since the generic GPIO binding is used,
+      the amount of cells must be specified as 2. See the below
+      mentioned gpio binding representation for description of particular cells.
+    const: 2
+
+  gpio-ranges:
+    description: GPIO valid number range.
+    maxItems: 1
+
+  reg:
+    description:
+      Physical address base for gpio base and eint registers.
+    minItems: 2
+
+  reg-names:
+    items:
+      - const: base
+      - const: eint
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 2
+
+  interrupts:
+    description: The interrupt outputs to sysirq.
+    maxItems: 1
+
+# PIN CONFIGURATION NODES
+patternProperties:
+  '-pins$':
+    type: object
+    additionalProperties: false
+    patternProperties:
+      '^pins':
+        type: object
+        additionalProperties: false
+        description: |
+          A pinctrl node should contain at least one subnodes 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.
+          An example of using macro:
+          pincontroller {
+            /* GPIO0 set as multifunction GPIO0 */
+            gpio-pins {
+              pins {
+                pinmux = <PINMUX_GPIO0__FUNC_GPIO0>;
+              }
+            };
+            /* GPIO45 set as multifunction SDA0 */
+            i2c0-pins {
+              pins {
+                pinmux = <PINMUX_GPIO45__FUNC_SDA0>;
+              }
+            };
+          };
+        $ref: "pinmux-node.yaml"
+
+        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/<soc>-pinfunc.h
+              directly.
+
+          drive-strength:
+            enum: [2, 4, 6, 8, 10, 12, 14, 16]
+
+          bias-pull-down:
+            oneOf:
+              - type: boolean
+              - enum: [100, 101, 102, 103]
+                description: mt6795 pull down PUPD/R0/R1 type define value.
+            description: |
+               For normal pull down type, it is not necessary to specify R1R0
+               values; When pull down type is PUPD/R0/R1, adding R1R0 defines
+               will set different resistance values.
+
+          bias-pull-up:
+            oneOf:
+              - type: boolean
+              - enum: [100, 101, 102, 103]
+                description: mt6795 pull up PUPD/R0/R1 type define value.
+            description: |
+               For normal pull up type, it is not necessary to specify R1R0
+               values; When pull up type is PUPD/R0/R1, adding R1R0 defines
+               will set different resistance values.
+
+          bias-disable: true
+
+          output-high: true
+
+          output-low: true
+
+          input-enable: true
+
+          input-disable: true
+
+          input-schmitt-enable: true
+
+          input-schmitt-disable: true
+
+          mediatek,pull-up-adv:
+            description: |
+              Pull up setings for 2 pull resistors, R0 and R1. User can
+              configure those special pins. Valid arguments are described as below:
+              0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
+              1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
+              2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
+              3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1, 2, 3]
+
+          mediatek,pull-down-adv:
+            description: |
+              Pull down settings for 2 pull resistors, R0 and R1. User can
+              configure those special pins. Valid arguments are described as below:
+              0: (R1, R0) = (0, 0) which means R1 disabled and R0 disabled.
+              1: (R1, R0) = (0, 1) which means R1 disabled and R0 enabled.
+              2: (R1, R0) = (1, 0) which means R1 enabled and R0 disabled.
+              3: (R1, R0) = (1, 1) which means R1 enabled and R0 enabled.
+            $ref: /schemas/types.yaml#/definitions/uint32
+            enum: [0, 1, 2, 3]
+
+        required:
+          - pinmux
+
+allOf:
+  - $ref: "pinctrl.yaml#"
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - interrupts
+  - interrupt-controller
+  - '#interrupt-cells'
+  - gpio-controller
+  - '#gpio-cells'
+  - gpio-ranges
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/pinctrl/mt6795-pinfunc.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        pio: pinctrl@10005000 {
+            compatible = "mediatek,mt6795-pinctrl";
+            reg = <0 0x10005000 0 0x1000>, <0 0x1000b000 0 0x1000>;
+            reg-names = "base", "eint";
+            gpio-controller;
+            #gpio-cells = <2>;
+            gpio-ranges = <&pio 0 0 196>;
+            interrupt-controller;
+            interrupts = <GIC_SPI 153 IRQ_TYPE_LEVEL_HIGH>;
+            #interrupt-cells = <2>;
+
+            i2c0-pins {
+                pins-sda-scl {
+                    pinmux = <PINMUX_GPIO45__FUNC_SDA0>,
+                             <PINMUX_GPIO46__FUNC_SCL0>;
+                };
+            };
+
+            mmc0-pins {
+                pins-cmd-dat {
+                    pinmux = <PINMUX_GPIO154__FUNC_MSDC0_DAT0>,
+                             <PINMUX_GPIO155__FUNC_MSDC0_DAT1>,
+                             <PINMUX_GPIO156__FUNC_MSDC0_DAT2>,
+                             <PINMUX_GPIO157__FUNC_MSDC0_DAT3>,
+                             <PINMUX_GPIO158__FUNC_MSDC0_DAT4>,
+                             <PINMUX_GPIO159__FUNC_MSDC0_DAT5>,
+                             <PINMUX_GPIO160__FUNC_MSDC0_DAT6>,
+                             <PINMUX_GPIO161__FUNC_MSDC0_DAT7>,
+                             <PINMUX_GPIO162__FUNC_MSDC0_CMD>;
+                    input-enable;
+                    bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+                };
+
+                pins-clk {
+                    pinmux = <PINMUX_GPIO163__FUNC_MSDC0_CLK>;
+                    bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
+                };
+
+                pins-rst {
+                    pinmux = <PINMUX_GPIO165__FUNC_MSDC0_RSTB>;
+                    bias-pull-up = <MTK_PUPD_SET_R1R0_10>;
+                };
+            };
+        };
+    };