[PATCH v3 7/8] arm64: dts: renesas: rzg3e-smarc-som: Add support for enable SD on SDHI0

[Biju Das <biju.das.jz@xxxxxxxxxxxxxx>]

Add support for enabling SD on SDHI0 on RZ/G3E SMARC SoM. It is enabled
by setting the macro SW_SD0_DEV_SEL to 1 in board DTS and setting the
switch SYS.1 to ON position on the SoM.

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v2->v3:
 * Dropped #if guard in pinctrl node for SDHI0
 * Renamed the label/node sdhi0_pins: sd0->sdhi0_usd_pins: sd0-usd.
 * Dropped overriding regulator name.
 * Updated regulator phandle.
v2:
 * New patch
---
 .../boot/dts/renesas/r9a09g047e57-smarc.dts   |  3 ++
 .../boot/dts/renesas/rzg3e-smarc-som.dtsi     | 54 +++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts b/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
index c063d47e2952..152a00aa354b 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
+++ b/arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts
@@ -7,6 +7,9 @@
 
 /dts-v1/;
 
+/* Switch selection settings */
+#define SW_SD0_DEV_SEL		0
+
 #include <dt-bindings/pinctrl/renesas,r9a09g047-pinctrl.h>
 #include "r9a09g047e57.dtsi"
 #include "rzg3e-smarc-som.dtsi"
diff --git a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
index fcbabe2cb003..1966f2ce70b8 100644
--- a/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
+++ b/arch/arm64/boot/dts/renesas/rzg3e-smarc-som.dtsi
@@ -5,6 +5,15 @@
  * Copyright (C) 2024 Renesas Electronics Corp.
  */
 
+/*
+ * Please set the switch position SYS.1 on the SoM and the corresponding macro
+ * SW_SD0_DEV_SEL on the board DTS:
+ *
+ * SW_SD0_DEV_SEL:
+ *      0 - SD0 is connected to eMMC (default)
+ *      1 - SD0 is connected to uSD0 card
+ */
+
 / {
 	compatible = "renesas,rzg3e-smarcm", "renesas,r9a09g047e57", "renesas,r9a09g047";
 
@@ -43,6 +52,32 @@ &audio_extal_clk {
 };
 
 &pinctrl {
+	sdhi0_usd_pins: sd0-usd {
+		sd0-cd {
+			pinmux = <RZG3E_PORT_PINMUX(5, 0, 8)>;
+		};
+
+		sd0-ctrl {
+			pins = "SD0CLK", "SD0CMD";
+			renesas,output-impedance = <3>;
+		};
+
+		sd0-data {
+			pins = "SD0DAT0", "SD0DAT1", "SD0DAT2", "SD0DAT3";
+			renesas,output-impedance = <3>;
+		};
+
+		sd0-iovs {
+			pins = "SD0IOVS";
+			renesas,output-impedance = <3>;
+		};
+
+		sd0-pwen {
+			pins = "SD0PWEN";
+			renesas,output-impedance = <3>;
+		};
+	};
+
 	sdhi0_emmc_pins: sd0-emmc {
 		sd0-ctrl {
 			pins = "SD0CLK", "SD0CMD";
@@ -96,6 +131,24 @@ &rtxin_clk {
 	clock-frequency = <32768>;
 };
 
+#if (SW_SD0_DEV_SEL)
+&sdhi0 {
+	pinctrl-0 = <&sdhi0_usd_pins>;
+	pinctrl-1 = <&sdhi0_usd_pins>;
+	pinctrl-names = "default", "state_uhs";
+
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&sdhi0_vqmmc>;
+	bus-width = <4>;
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+	status = "okay";
+};
+
+&sdhi0_vqmmc {
+	status = "okay";
+};
+#else
 &sdhi0 {
 	pinctrl-0 = <&sdhi0_emmc_pins>;
 	pinctrl-1 = <&sdhi0_emmc_pins>;
@@ -109,6 +162,7 @@ &sdhi0 {
 	fixed-emmc-driver-type = <1>;
 	status = "okay";
 };
+#endif
 
 &sdhi2 {
 	pinctrl-0 = <&sdhi2_pins>;
-- 
2.43.0