arm64: dts: renesas: spider-cpu: Enable eMMC0

This enables the on-board eMMC on the Spider board. Switch SW3 has to be
in the default (neutral) position. Other settings will not be supported
upstream!

Signed-off-by: Wolfram Sang <[e-mail]>
Reviewed-by: Yoshihiro Shimoda <[e-mail]>
Tested-by: Yoshihiro Shimoda <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Geert Uytterhoeven <[e-mail]>

arch/arm64/boot/dts/renesas/r8a779f0-spider-cpu.dtsi

···
 		device_type = "memory";
 		reg = <0x4 0x80000000 0x0 0x80000000>;
 	};
+
+	reg_1p8v: regulator-1p8v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-1.8V";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
+	reg_3p3v: regulator-3p3v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-3.3V";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
 };
 
 &extal_clk {
···
 	};
 };
 
+/*
+ * This board also has a microSD slot which we will not support upstream
+ * because we cannot directly switch voltages in software.
+ */
+&mmc0 {
+	pinctrl-0 = <&mmc_pins>;
+	pinctrl-1 = <&mmc_pins>;
+	pinctrl-names = "default", "state_uhs";
+
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&reg_1p8v>;
+	mmc-hs200-1_8v;
+	mmc-hs400-1_8v;
+	bus-width = <8>;
+	no-sd;
+	no-sdio;
+	non-removable;
+	full-pwr-cycle-in-suspend;
+	status = "okay";
+};
+
 &pfc {
 	pinctrl-0 = <&scif_clk_pins>;
 	pinctrl-names = "default";
···
 	i2c4_pins: i2c4 {
 		groups = "i2c4";
 		function = "i2c4";
+	};
+
+	mmc_pins: mmc {
+		groups = "mmc_data8", "mmc_ctrl", "mmc_ds";
+		function = "mmc";
+		power-source = <1800>;
 	};
 
 	scif0_pins: scif0 {