riscv: dts: sophgo: sg2042: add pinctrl support

Add pinctrl node and related pin configuration for SG2042 SoC.

Link: https://lore.kernel.org/r/20250211051801.470800-9-inochiama@gmail.com
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Chen Wang <wangchen20@iscas.ac.cn>

Author: inochisa

arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts

@@ -42,6 +42,8 @@
 };
 
 &emmc {
+	pinctrl-0 = <&emmc_cfg>;
+	pinctrl-names = "default";
 	bus-width = <4>;
 	no-sdio;
 	no-sd;
@@ -51,6 +53,8 @@
 };
 
 &i2c1 {
+	pinctrl-0 = <&i2c1_cfg>;
+	pinctrl-names = "default";
 	status = "okay";
 
 	mcu: syscon@17 {
@@ -60,7 +64,73 @@
 	};
 };
 
+&pinctrl {
+	emmc_cfg: sdhci-emmc-cfg {
+		sdhci-emmc-wp-pins {
+			pinmux = <PINMUX(PIN_EMMC_WP, 0)>;
+			bias-disable;
+			drive-strength-microamp = <26800>;
+			input-schmitt-disable;
+		};
+
+		sdhci-emmc-cd-pins {
+			pinmux = <PINMUX(PIN_EMMC_CD, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <26800>;
+			input-schmitt-enable;
+		};
+
+		sdhci-emmc-rst-pwr-pins {
+			pinmux = <PINMUX(PIN_EMMC_RST, 0)>,
+				 <PINMUX(PIN_EMMC_PWR_EN, 0)>;
+			bias-disable;
+			drive-strength-microamp = <26800>;
+			input-schmitt-disable;
+		};
+	};
+
+	i2c1_cfg: i2c1-cfg {
+		i2c1-pins {
+			pinmux = <PINMUX(PIN_IIC1_SDA, 0)>,
+				 <PINMUX(PIN_IIC1_SCL, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <26800>;
+			input-schmitt-enable;
+		};
+	};
+
+	sd_cfg: sdhci-sd-cfg {
+		sdhci-sd-cd-wp-pins {
+			pinmux = <PINMUX(PIN_SDIO_CD, 0)>,
+				 <PINMUX(PIN_SDIO_WP, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <26800>;
+			input-schmitt-enable;
+		};
+
+		sdhci-sd-rst-pwr-pins {
+			pinmux = <PINMUX(PIN_SDIO_RST, 0)>,
+				 <PINMUX(PIN_SDIO_PWR_EN, 0)>;
+			bias-disable;
+			drive-strength-microamp = <26800>;
+			input-schmitt-disable;
+		};
+	};
+
+	uart0_cfg: uart0-cfg {
+		uart0-rx-pins {
+			pinmux = <PINMUX(PIN_UART0_TX, 0)>,
+				 <PINMUX(PIN_UART0_RX, 0)>;
+			bias-pull-up;
+			drive-strength-microamp = <26800>;
+			input-schmitt-enable;
+		};
+	};
+};
+
 &sd {
+	pinctrl-0 = <&sd_cfg>;
+	pinctrl-names = "default";
 	bus-width = <4>;
 	no-sdio;
 	no-mmc;
@@ -69,6 +139,8 @@
 };
 
 &uart0 {
+	pinctrl-0 = <&uart0_cfg>;
+	pinctrl-names = "default";
 	status = "okay";
 };
 

arch/riscv/boot/dts/sophgo/sg2042.dtsi

@@ -8,6 +8,7 @@
 #include <dt-bindings/clock/sophgo,sg2042-pll.h>
 #include <dt-bindings/clock/sophgo,sg2042-rpgate.h>
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/pinctrl/pinctrl-sg2042.h>
 #include <dt-bindings/reset/sophgo,sg2042-reset.h>
 
 #include "sg2042-cpus.dtsi"
@@ -200,6 +201,11 @@
 			#clock-cells = <1>;
 		};
 
+		pinctrl: pinctrl@7030011000 {
+			compatible = "sophgo,sg2042-pinctrl";
+			reg = <0x70 0x30011000 0x0 0x1000>;
+		};
+
 		clkgen: clock-controller@7030012000 {
 			compatible = "sophgo,sg2042-clkgen";
 			reg = <0x70 0x30012000 0x0 0x1000>;