arm64: dts: renesas: rzg2ul-smarc-som: Enable eMMC on SMARC platform

RZ/G2UL SoM has both 64GB eMMC and microSD connected to SDHI0.

Both these interfaces are mutually exclusive and the SD0 device
selection is based on SW1[2] on SoM module.

Set SW1[2] to position OFF for selecting eMMC
Set SW1[2] to position ON for selecting microSD

This patch enables eMMC on RZ/G2UL SMARC platform by default.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20220402081328.26292-7-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg2ul-smarc-som.dtsi

@@ -19,6 +19,15 @@
 		reg = <0x0 0x48000000 0x0 0x38000000>;
 	};
 
+	reg_1p8v: regulator0 {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-1.8V";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
 	reg_3p3v: regulator1 {
 		compatible = "regulator-fixed";
 		regulator-name = "fixed-3.3V";
@@ -27,8 +36,103 @@
 		regulator-boot-on;
 		regulator-always-on;
 	};
+
+#if !(SW_SW0_DEV_SEL)
+	vccq_sdhi0: regulator-vccq-sdhi0 {
+		compatible = "regulator-gpio";
+
+		regulator-name = "SDHI0 VccQ";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <3300000>;
+		states = <3300000 1>, <1800000 0>;
+		regulator-boot-on;
+		gpios = <&pinctrl RZG2L_GPIO(6, 2) GPIO_ACTIVE_HIGH>;
+		regulator-always-on;
+	};
+#endif
 };
 
 &extal_clk {
 	clock-frequency = <24000000>;
 };
+
+&pinctrl {
+	sdhi0_emmc_pins: sd0emmc {
+		sd0_emmc_data {
+			pins = "SD0_DATA0", "SD0_DATA1", "SD0_DATA2", "SD0_DATA3",
+			       "SD0_DATA4", "SD0_DATA5", "SD0_DATA6", "SD0_DATA7";
+			power-source = <1800>;
+		};
+
+		sd0_emmc_ctrl {
+			pins = "SD0_CLK", "SD0_CMD";
+			power-source = <1800>;
+		};
+
+		sd0_emmc_rst {
+			pins = "SD0_RST#";
+			power-source = <1800>;
+		};
+	};
+
+	sdhi0_pins: sd0 {
+		sd0_data {
+			pins = "SD0_DATA0", "SD0_DATA1", "SD0_DATA2", "SD0_DATA3";
+			power-source = <3300>;
+		};
+
+		sd0_ctrl {
+			pins = "SD0_CLK", "SD0_CMD";
+			power-source = <3300>;
+		};
+
+		sd0_mux {
+			pinmux = <RZG2L_PORT_PINMUX(0, 0, 1)>; /* SD0_CD */
+		};
+	};
+
+	sdhi0_pins_uhs: sd0_uhs {
+		sd0_data_uhs {
+			pins = "SD0_DATA0", "SD0_DATA1", "SD0_DATA2", "SD0_DATA3";
+			power-source = <1800>;
+		};
+
+		sd0_ctrl_uhs {
+			pins = "SD0_CLK", "SD0_CMD";
+			power-source = <1800>;
+		};
+
+		sd0_mux_uhs {
+			pinmux = <RZG2L_PORT_PINMUX(0, 0, 1)>; /* SD0_CD */
+		};
+	};
+};
+
+#if (SW_SW0_DEV_SEL)
+&sdhi0 {
+	pinctrl-0 = <&sdhi0_emmc_pins>;
+	pinctrl-1 = <&sdhi0_emmc_pins>;
+	pinctrl-names = "default", "state_uhs";
+
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&reg_1p8v>;
+	bus-width = <8>;
+	mmc-hs200-1_8v;
+	non-removable;
+	fixed-emmc-driver-type = <1>;
+	status = "okay";
+};
+#else
+&sdhi0 {
+	pinctrl-0 = <&sdhi0_pins>;
+	pinctrl-1 = <&sdhi0_pins_uhs>;
+	pinctrl-names = "default", "state_uhs";
+
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&vccq_sdhi0>;
+	bus-width = <4>;
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+	status = "okay";
+};
+#endif

arch/arm64/boot/dts/renesas/rzg2ul-smarc.dtsi

@@ -5,6 +5,14 @@
  * Copyright (C) 2022 Renesas Electronics Corp.
  */
 
+/*
+ * DIP-Switch SW1 setting
+ * 1 : High; 0: Low
+ * SW1-2 : SW_SD0_DEV_SEL	(0: uSD; 1: eMMC)
+ * Please change below macros according to SW1 setting
+ */
+#define SW_SW0_DEV_SEL	1
+
 #include "rzg2ul-smarc-som.dtsi"
 #include "rzg2ul-smarc-pinfunction.dtsi"
 #include "rz-smarc-common.dtsi"