[PATCH v10 2/4] riscv: dts: spacemit: k1-orangepi-rv2: add SD card support with UHS modes

[Iker Pedrosa]

Add complete SD card controller support with UHS high-speed modes.

- Enable sdhci0 controller with 4-bit bus width
- Configure card detect GPIO with GPIO_ACTIVE_LOW logic
- Connect vmmc-supply to buck4 for 3.3V card power
- Connect vqmmc-supply to aldo1 for 1.8V/3.3V I/O switching
- Add dual pinctrl states for voltage-dependent pin configuration
- Support UHS-I SDR25, SDR50, and SDR104 modes
- Add stable MMC device aliases (mmc0 = eMMC, mmc1 = SD card)

This enables full SD card functionality including high-speed UHS modes
for improved performance.

Tested-by: Anand Moon <linux.amoon at gmail.com>
Tested-by: Trevor Gamblin <tgamblin at baylibre.com>
Tested-by: Michael Opdenacker <michael.opdenacker at rootcommit.com>
Tested-by: Vincent Legoll <legoll at online.fr>
Signed-off-by: Iker Pedrosa <ikerpedrosam at gmail.com>
---
 arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts b/arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts
index c95ca38e3d4a..bd40bc9011e2 100644
--- a/arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-orangepi-rv2.dts
@@ -17,6 +17,8 @@ aliases {
 		serial0 = &uart0;
 		ethernet0 = &eth0;
 		ethernet1 = &eth1;
+		mmc0 = &emmc;
+		mmc1 = &sdhci0;
 	};
 
 	chosen {
@@ -202,7 +204,7 @@ buck6 {
 				regulator-always-on;
 			};
 
-			aldo1 {
+			aldo1: aldo1 {
 				regulator-min-microvolt = <500000>;
 				regulator-max-microvolt = <3400000>;
 				regulator-boot-on;
@@ -319,3 +321,21 @@ hub_3_0: hub at 2 {
 		vdd-supply = <&vcc_5v0>;
 	};
 };
+
+&sdhci0 {
+	pinctrl-names = "default", "uhs";
+	pinctrl-0 = <&mmc1_cfg>;
+	pinctrl-1 = <&mmc1_uhs_cfg>;
+	bus-width = <4>;
+	cd-gpios = <&gpio K1_GPIO(80) GPIO_ACTIVE_LOW>;
+	no-mmc;
+	no-sdio;
+	disable-wp;
+	cap-sd-highspeed;
+	vmmc-supply = <&buck4_3v3>;
+	vqmmc-supply = <&aldo1>;
+	sd-uhs-sdr25;
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+	status = "okay";
+};

-- 
2.54.0