dt-bindings: pinctrl: add bindings for MT7981 SoC

Add bindings for the MT7981 pinctrl driver. As MT7981 has most features
in common with MT7986 (but has a different layout in terms on pinctrl
and clocks), the existing mediatek,mt7986-pinctrl.yaml was used as an
example to create a similar document covering MT7981.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/3f0fd0becc338eef66caeb7244c3c432b8d1ef7a.1674693008.git.daniel@makrotopia.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/mediatek,mt7981-pinctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/mediatek,mt7981-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Mediatek MT7981 Pin Controller
+
+maintainers:
+  - Daniel Golle <daniel@makrotopia.org>
+
+description:
+  The MediaTek's MT7981 Pin controller is used to control SoC pins.
+
+properties:
+  compatible:
+    enum:
+      - mediatek,mt7981-pinctrl
+
+  reg:
+    minItems: 9
+    maxItems: 9
+
+  reg-names:
+    items:
+      - const: gpio
+      - const: iocfg_rt
+      - const: iocfg_rm
+      - const: iocfg_rb
+      - const: iocfg_lb
+      - const: iocfg_bl
+      - const: iocfg_tm
+      - const: iocfg_tl
+      - const: eint
+
+  gpio-controller: true
+
+  "#gpio-cells":
+    const: 2
+    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.
+
+  gpio-ranges:
+    minItems: 1
+    maxItems: 5
+    description: GPIO valid number range.
+
+  interrupt-controller: true
+
+  interrupts:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - gpio-controller
+  - "#gpio-cells"
+
+patternProperties:
+  '-pins$':
+    type: object
+    additionalProperties: false
+
+    patternProperties:
+      '^.*mux.*$':
+        type: object
+        additionalProperties: false
+        description: |
+          pinmux configuration nodes.
+
+          The following table shows the effective values of "group", "function"
+          properties and chip pinout pins
+
+          groups                 function    pins (in pin#)
+          ---------------------------------------------------------------------
+          "wa_aice1"             "wa_aice"   0, 1
+          "wa_aice2"             "wa_aice"   0, 1
+          "wm_uart_0"            "uart"      0, 1
+          "dfd"                  "dfd"       0, 1, 4, 5
+          "watchdog"             "watchdog"  2
+          "pcie_pereset"         "pcie"      3
+          "jtag"                 "jtag"      4, 5, 6, 7, 8
+          "wm_jtag_0"            "jtag"      4, 5, 6, 7, 8
+          "wo0_jtag_0"           "jtag"      9, 10, 11, 12, 13
+          "uart2_0"              "uart"      4, 5, 6, 7
+          "gbe_led0"             "led"       8
+          "pta_ext_0"            "pta"       4, 5, 6
+          "pwm2"                 "pwm"       7
+          "net_wo0_uart_txd_0"   "uart"      8
+          "spi1_0"               "spi"       4, 5, 6, 7
+          "i2c0_0"               "i2c"       6, 7
+          "dfd_ntrst"            "dfd"       8
+          "wm_aice1"             "wa_aice"   9, 10
+          "pwm0_0"               "pwm"       13
+          "pwm0_1"               "pwm"       15
+          "pwm1_0"               "pwm"       14
+          "pwm1_1"               "pwm"       15
+          "net_wo0_uart_txd_1"   "uart"      14
+          "net_wo0_uart_txd_2"   "uart"      15
+          "gbe_led1"             "led"       13
+          "pcm"                  "pcm"       9, 10, 11, 12, 13, 25
+          "watchdog1"            "watchdog"  13
+          "udi"                  "udi"       9, 10, 11, 12, 13
+          "drv_vbus"             "usb"       14
+          "emmc_45"              "flash"     15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25
+          "snfi"                 "flash"     16, 17, 18, 19, 20, 21
+          "spi0"                 "spi"       16, 17, 18, 19
+          "spi0_wp_hold"         "spi"       20, 21
+          "spi1_1"               "spi"       22, 23, 24, 25
+          "spi2"                 "spi"       26, 27, 28, 29
+          "spi2_wp_hold"         "spi"       30, 31
+          "uart1_0"              "uart"      16, 17, 18, 19
+          "uart1_1"              "uart"      26, 27, 28, 29
+          "uart2_1"              "uart"      22, 23, 24, 25
+          "pta_ext_1"            "pta"       22, 23, 24
+          "wm_aurt_1"            "uart"      20, 21
+          "wm_aurt_2"            "uart"      30, 31
+          "wm_jtag_1"            "jtag"      20, 21, 22, 23, 24
+          "wo0_jtag_1"           "jtag"      25, 26, 27, 28, 29
+          "wa_aice3"             "wa_aice"   28, 20
+          "wm_aice2"             "wa_aice"   30, 31
+          "i2c0_1"               "i2c"       30, 31
+          "u2_phy_i2c"           "i2c"       30, 31
+          "uart0"                "uart"      32, 33
+          "sgmii1_phy_i2c"       "i2c"       32, 33
+          "u3_phy_i2c"           "i2c"       32, 33
+          "sgmii0_phy_i2c"       "i2c"       32, 33
+          "pcie_clk"             "pcie"      34
+          "pcie_wake"            "pcie"      35
+          "i2c0_2"               "i2c"       36, 37
+          "smi_mdc_mdio"         "eth"       36, 37
+          "gbe_ext_mdc_mdio"     "eth"       36, 37
+          "wf0_mode1"            "eth"       40, 41, 42, 43, 44, 45, 46, 47, 48,
+                                             49, 50, 51, 52, 53, 54, 55, 56
+
+          "wf0_mode3"            "eth"       45, 46, 47, 48, 49, 51
+          "wf2g_led0"            "led"       30
+          "wf2g_led1"            "led"       34
+          "wf5g_led0"            "led"       31
+          "wf5g_led1"            "led"       35
+          "mt7531_int"           "eth"       38
+          "ant_sel"              "ant"       14, 15, 16, 17, 18, 19, 20, 21, 22
+                                             23, 24, 25, 34, 35
+
+        $ref: /schemas/pinctrl/pinmux-node.yaml
+        properties:
+          function:
+            description:
+              A string containing the name of the function to mux to the group.
+            enum: [wa_aice, dfd, jtag, pta, pcm, udi, usb, ant, eth, i2c, led,
+                   pwm, spi, uart, watchdog, flash, pcie]
+          groups:
+            description:
+              An array of strings. Each string contains the name of a group.
+
+        required:
+          - function
+          - groups
+
+        allOf:
+          - if:
+              properties:
+                function:
+                  const: wa_aice
+            then:
+              properties:
+                groups:
+                  enum: [wa_aice1, wa_aice2, wm_aice1_1, wa_aice3, wm_aice1_2]
+          - if:
+              properties:
+                function:
+                  const: dfd
+            then:
+              properties:
+                groups:
+                  enum: [dfd, dfd_ntrst]
+          - if:
+              properties:
+                function:
+                  const: jtag
+            then:
+              properties:
+                groups:
+                  enum: [jtag, wm_jtag_0, wo0_jtag_0, wo0_jtag_1, wm_jtag_1]
+          - if:
+              properties:
+                function:
+                  const: pta
+            then:
+              properties:
+                groups:
+                  enum: [pta_ext_0, pta_ext_1]
+          - if:
+              properties:
+                function:
+                  const: pcm
+            then:
+              properties:
+                groups:
+                  enum: [pcm]
+          - if:
+              properties:
+                function:
+                  const: udi
+            then:
+              properties:
+                groups:
+                  enum: [udi]
+          - if:
+              properties:
+                function:
+                  const: usb
+            then:
+              properties:
+                groups:
+                  enum: [drv_vbus]
+          - if:
+              properties:
+                function:
+                  const: ant
+            then:
+              properties:
+                groups:
+                  enum: [ant_sel]
+          - if:
+              properties:
+                function:
+                  const: eth
+            then:
+              properties:
+                groups:
+                  enum: [smi_mdc_mdio, gbe_ext_mdc_mdio, wf0_mode1, wf0_mode3,
+                         mt7531_int]
+          - if:
+              properties:
+                function:
+                  const: i2c
+            then:
+              properties:
+                groups:
+                  enum: [i2c0_0, i2c0_1, u2_phy_i2c, sgmii1_phy_i2c, u3_phy_i2c,
+                         sgmii0_phy_i2c, i2c0_2]
+          - if:
+              properties:
+                function:
+                  const: led
+            then:
+              properties:
+                groups:
+                  enum: [gbe_led0, gbe_led1, wf2g_led0, wf2g_led1, wf5g_led0, wf5g_led1]
+          - if:
+              properties:
+                function:
+                  const: pwm
+            then:
+              properties:
+                groups:
+                  items:
+                    enum: [pwm2, pwm0_0, pwm0_1, pwm1_0, pwm1_1]
+                  maxItems: 3
+          - if:
+              properties:
+                function:
+                  const: spi
+            then:
+              properties:
+                groups:
+                  items:
+                    enum: [spi1_0, spi0, spi0_wp_hold, spi1_1, spi2, spi2_wp_hold]
+                  maxItems: 4
+          - if:
+              properties:
+                function:
+                  const: uart
+            then:
+              properties:
+                groups:
+                  items:
+                    enum: [wm_uart_0, uart2_0, net_wo0_uart_txd_0,
+                           net_wo0_uart_txd_1, net_wo0_uart_txd_2, uart1_0,
+                           uart1_1, uart2_1, wm_aurt_1, wm_aurt_2, uart0]
+          - if:
+              properties:
+                function:
+                  const: watchdog
+            then:
+              properties:
+                groups:
+                  enum: [watchdog]
+          - if:
+              properties:
+                function:
+                  const: flash
+            then:
+              properties:
+                groups:
+                  items:
+                    enum: [emmc_45, snfi]
+                  maxItems: 1
+          - if:
+              properties:
+                function:
+                  const: pcie
+            then:
+              properties:
+                groups:
+                  items:
+                    enum: [pcie_clk, pcie_wake, pcie_pereset]
+                  maxItems: 3
+
+      '^.*conf.*$':
+        type: object
+        additionalProperties: false
+        description: pinconf configuration nodes.
+        $ref: /schemas/pinctrl/pincfg-node.yaml
+
+        properties:
+          pins:
+            description:
+              An array of strings. Each string contains the name of a pin.
+            items:
+              enum: [GPIO_WPS, GPIO_RESET, SYS_WATCHDOG, PCIE_PERESET_N,
+                     JTAG_JTDO, JTAG_JTDI, JTAG_JTMS, JTAG_JTCLK, JTAG_JTRST_N,
+                     WO_JTAG_JTDO, WO_JTAG_JTDI, WO_JTAG_JTMS, WO_JTAG_JTCLK,
+                     WO_JTAG_JTRST_N, USB_VBUS, PWM0, SPI0_CLK, SPI0_MOSI,
+                     SPI0_MISO, SPI0_CS, SPI0_HOLD, SPI0_WP, SPI1_CLK, SPI1_MOSI,
+                     SPI1_MISO, SPI1_CS, SPI2_CLK, SPI2_MOSI, SPI2_MISO, SPI2_CS,
+                     SPI2_HOLD, SPI2_WP, UART0_RXD, UART0_TXD, PCIE_CLK_REQ,
+                     PCIE_WAKE_N, SMI_MDC, SMI_MDIO, GBE_INT, GBE_RESET,
+                     WF_DIG_RESETB, WF_CBA_RESETB, WF_XO_REQ, WF_TOP_CLK,
+                     WF_TOP_DATA, WF_HB1, WF_HB2, WF_HB3, WF_HB4, WF_HB0,
+                     WF_HB0_B, WF_HB5, WF_HB6, WF_HB7, WF_HB8, WF_HB9, WF_HB10]
+            maxItems: 57
+
+          bias-disable: true
+
+          bias-pull-up:
+            oneOf:
+              - type: boolean
+                description: normal pull up.
+              - enum: [100, 101, 102, 103]
+                description: >
+                  PUPD/R1/R0 pull down type. See MTK_PUPD_SET_R1R0 defines in
+                  dt-bindings/pinctrl/mt65xx.h.
+
+          bias-pull-down:
+            oneOf:
+              - type: boolean
+                description: normal pull down.
+              - enum: [100, 101, 102, 103]
+                description: >
+                  PUPD/R1/R0 pull down type. See MTK_PUPD_SET_R1R0 defines in
+                  dt-bindings/pinctrl/mt65xx.h.
+
+          input-enable: true
+
+          input-disable: true
+
+          output-enable: true
+
+          output-low: true
+
+          output-high: true
+
+          input-schmitt-enable: true
+
+          input-schmitt-disable: true
+
+          drive-strength:
+            enum: [2, 4, 6, 8, 10, 12, 14, 16]
+
+          mediatek,pull-up-adv:
+            description: |
+              Valid arguments for 'mediatek,pull-up-adv' are '0', '1', '2', '3'
+              Pull up setings for 2 pull resistors, R0 and R1. 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: |
+              Valid arguments for 'mediatek,pull-up-adv' are '0', '1', '2', '3'
+              Pull down setings for 2 pull resistors, R0 and R1. 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:
+          - pins
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/pinctrl/mt65xx.h>
+
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+      pio: pinctrl@11d00000 {
+        compatible = "mediatek,mt7981-pinctrl";
+        reg = <0 0x11d00000 0 0x1000>,
+              <0 0x11c00000 0 0x1000>,
+              <0 0x11c10000 0 0x1000>,
+              <0 0x11d20000 0 0x1000>,
+              <0 0x11e00000 0 0x1000>,
+              <0 0x11e20000 0 0x1000>,
+              <0 0x11f00000 0 0x1000>,
+              <0 0x11f10000 0 0x1000>,
+              <0 0x1000b000 0 0x1000>;
+        reg-names = "gpio", "iocfg_rt", "iocfg_rm",
+                    "iocfg_rb", "iocfg_lb", "iocfg_bl",
+                    "iocfg_tm", "iocfg_tl", "eint";
+        gpio-controller;
+        #gpio-cells = <2>;
+        gpio-ranges = <&pio 0 0 56>;
+        interrupt-controller;
+        interrupts = <GIC_SPI 225 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-parent = <&gic>;
+        #interrupt-cells = <2>;
+
+        mdio_pins: mdio-pins {
+          mux {
+            function = "eth";
+            groups = "smi_mdc_mdio";
+          };
+        };
+
+        spi0_flash_pins: spi0-pins {
+          mux {
+            function = "spi";
+            groups = "spi0", "spi0_wp_hold";
+          };
+
+          conf-pu {
+            pins = "SPI0_CS", "SPI0_HOLD", "SPI0_WP";
+            drive-strength = <MTK_DRIVE_8mA>;
+            bias-pull-up = <MTK_PUPD_SET_R1R0_11>;
+          };
+
+          conf-pd {
+            pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO";
+            drive-strength = <MTK_DRIVE_8mA>;
+            bias-pull-down = <MTK_PUPD_SET_R1R0_11>;
+          };
+        };
+
+        pcie_pins: pcie-pins {
+          mux {
+            function = "pcie";
+            groups = "pcie_clk", "pcie_wake", "pcie_pereset";
+          };
+        };
+
+      };
+    };