dt-bindings: pinctrl: realtek: add RTD1315E pinctrl binding

Add device tree bindings for RTD1315E.
Signed-off-by: Tzuyi Chang <tychang@realtek.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230919101117.4097-6-tychang@realtek.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/realtek,rtd1315e-pinctrl.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2023 Realtek Semiconductor Corporation
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/realtek,rtd1315e-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Realtek DHC RTD1315E Pin Controller
+
+maintainers:
+  - TY Chang <tychang@realtek.com>
+
+description:
+  The Realtek DHC RTD1315E is a high-definition media processor SoC. The
+  RTD1315E pin controller is used to control pin function, pull up/down
+  resistor, drive strength, schmitt trigger and power source.
+
+properties:
+  compatible:
+    const: realtek,rtd1315e-pinctrl
+
+  reg:
+    maxItems: 1
+
+patternProperties:
+  '-pins$':
+    type: object
+    allOf:
+      - $ref: pincfg-node.yaml#
+      - $ref: pinmux-node.yaml#
+
+    properties:
+      pins:
+        items:
+          enum: [ gpio_0, gpio_1, emmc_rst_n, emmc_dd_sb, emmc_clk, emmc_cmd,
+                  gpio_6, gpio_7, gpio_8, gpio_9, gpio_10, gpio_11, gpio_12,
+                  gpio_13, gpio_14, gpio_15, gpio_16, gpio_17, gpio_18, gpio_19,
+                  gpio_20, emmc_data_0, emmc_data_1, emmc_data_2, usb_cc2, gpio_25,
+                  gpio_26, gpio_27, gpio_28, gpio_29, gpio_30, gpio_31, gpio_32,
+                  gpio_33, gpio_34, gpio_35, hif_data, hif_en, hif_rdy, hif_clk,
+                  gpio_dummy_40, gpio_dummy_41, gpio_dummy_42, gpio_dummy_43,
+                  gpio_dummy_44, gpio_dummy_45, gpio_46, gpio_47, gpio_48, gpio_49,
+                  gpio_50, usb_cc1, emmc_data_3, emmc_data_4, ir_rx, ur0_rx, ur0_tx,
+                  gpio_57, gpio_58, gpio_59, gpio_60, gpio_61, gpio_62, gpio_dummy_63,
+                  gpio_dummy_64, gpio_dummy_65, gpio_66, gpio_67, gpio_68, gpio_69,
+                  gpio_70, gpio_71, gpio_72, gpio_dummy_73, emmc_data_5, emmc_data_6,
+                  emmc_data_7, gpio_dummy_77, gpio_78, gpio_79, gpio_80, gpio_81,
+                  ur2_loc, gspi_loc, hi_width, sf_en, arm_trace_dbg_en,
+                  ejtag_aucpu_loc, ejtag_acpu_loc, ejtag_vcpu_loc, ejtag_scpu_loc,
+                  dmic_loc, vtc_dmic_loc, vtc_tdm_loc, vtc_i2si_loc, tdm_ai_loc,
+                  ai_loc, spdif_loc, hif_en_loc, scan_switch, wd_rset, boot_sel,
+                  reset_n, testmode ]
+
+      function:
+        enum: [ gpio, nf, emmc, ao, gspi_loc0, gspi_loc1, uart0, uart1,
+                uart2_loc0, uart2_loc1, i2c0, i2c1, i2c4, i2c5, pcie1,
+                etn_led, etn_phy, spi, pwm0_loc0, pwm0_loc1, pwm1_loc0,
+                pwm1_loc1, pwm2_loc0, pwm2_loc1, pwm3_loc0, pwm3_loc1,
+                spdif_optical_loc0, spdif_optical_loc1, usb_cc1, usb_cc2,
+                sd, dmic_loc0, dmic_loc1, ai_loc0, ai_loc1, tdm_ai_loc0,
+                tdm_ai_loc1, hi_loc0, hi_m, vtc_i2so, vtc_i2si_loc0,
+                vtc_i2si_loc1, vtc_dmic_loc0, vtc_dmic_loc1, vtc_tdm_loc0,
+                vtc_tdm_loc1, dc_fan, pll_test_loc0, pll_test_loc1,
+                ir_rx, uart2_disable, gspi_disable, hi_width_disable,
+                hi_width_1bit, sf_disable, sf_enable, scpu_ejtag_loc0,
+                scpu_ejtag_loc1, scpu_ejtag_loc2, scpu_ejtag_loc3,
+                acpu_ejtag_loc0, acpu_ejtag_loc1, acpu_ejtag_loc2,
+                vcpu_ejtag_loc0, vcpu_ejtag_loc1, vcpu_ejtag_loc2,
+                aucpu_ejtag_loc0, aucpu_ejtag_loc1, aucpu_ejtag_loc2,
+                gpu_ejtag, iso_tristate, dbg_out0, dbg_out1, standby_dbg,
+                spdif, arm_trace_debug_disable, arm_trace_debug_enable,
+                aucpu_ejtag_disable, acpu_ejtag_disable, vcpu_ejtag_disable,
+                scpu_ejtag_disable, vtc_dmic_loc_disable, vtc_tdm_disable,
+                vtc_i2si_disable, tdm_ai_disable, ai_disable, spdif_disable,
+                hif_disable, hif_enable, test_loop, pmic_pwrup ]
+
+      drive-strength:
+        enum: [4, 8]
+
+      bias-pull-down: true
+
+      bias-pull-up: true
+
+      bias-disable: true
+
+      input-schmitt-enable: true
+
+      input-schmitt-disable: true
+
+      drive-push-pull: true
+
+      power-source:
+        description: |
+          Valid arguments are described as below:
+          0: power supply of 1.8V
+          1: power supply of 3.3V
+        enum: [0, 1]
+
+      realtek,drive-strength-p:
+        description: |
+          Some of pins can be driven using the P-MOS and N-MOS transistor to
+          achieve finer adjustments. The block-diagram representation is as
+          follows:
+                         VDD
+                          |
+                      ||--+
+               +-----o||     P-MOS-FET
+               |      ||--+
+          IN --+          +----- out
+               |      ||--+
+               +------||     N-MOS-FET
+                      ||--+
+                          |
+                         GND
+          The driving strength of the P-MOS/N-MOS transistors impacts the
+          waveform's rise/fall times. Greater driving strength results in
+          shorter rise/fall times. Each P-MOS and N-MOS transistor offers
+          8 configurable levels (0 to 7), with higher values indicating
+          greater driving strength, contributing to achieving the desired
+          speed.
+
+          The realtek,drive-strength-p is used to control the driving strength
+          of the P-MOS output.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 7
+
+      realtek,drive-strength-n:
+        description: |
+          Similar to the realtek,drive-strength-p, the realtek,drive-strength-n
+          is used to control the driving strength of the N-MOS output.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 0
+        maximum: 7
+
+      realtek,duty-cycle:
+        description: |
+          An integer describing the level to adjust output duty cycle, controlling
+          the proportion of positive and negative waveforms in nanoseconds.
+          Valid arguments are described as below:
+          0: 0ns
+          2: + 0.25ns
+          3: + 0.5ns
+          4: -0.25ns
+          5: -0.5ns
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [ 0, 2, 3, 4, 5 ]
+
+    required:
+      - pins
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+     pinctrl@4e000 {
+         compatible = "realtek,rtd1315e-pinctrl";
+         reg = <0x4e000 0x130>;
+
+         emmc-hs200-pins {
+             pins = "emmc_clk",
+                    "emmc_cmd",
+                    "emmc_data_0",
+                    "emmc_data_1",
+                    "emmc_data_2",
+                    "emmc_data_3",
+                    "emmc_data_4",
+                    "emmc_data_5",
+                    "emmc_data_6",
+                    "emmc_data_7";
+             function = "emmc";
+             realtek,drive-strength-p = <0x2>;
+             realtek,drive-strength-n = <0x2>;
+         };
+
+         i2c-0-pins {
+             pins = "gpio_12",
+                    "gpio_13";
+             function = "i2c0";
+             drive-strength = <4>;
+         };
+     };