[PATCH v10 3/4] riscv: dts: spacemit: k1-bananapi-f3: 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 and internal pull-up
  support
- 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.

Suggested-by: Anand Moon <linux.amoon at gmail.com>
Tested-by: Anand Moon <linux.amoon at gmail.com>
Tested-by: Margherita Milani <margherita.milani at amarulasolutions.com>
Tested-by: Aurelien Jarno <aurelien at aurel32.net>
Reviewed-by: Aurelien Jarno <aurelien at aurel32.net>
Signed-off-by: Iker Pedrosa <ikerpedrosam at gmail.com>
---
 arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
index e20daa50a152..72f77e9edd63 100644
--- a/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
+++ b/arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts
@@ -17,6 +17,8 @@ aliases {
 		spi3 = &spi3;
 		i2c2 = &i2c2;
 		i2c8 = &i2c8;
+		mmc0 = &emmc;
+		mmc1 = &sdhci0;
 	};
 
 	chosen {
@@ -221,7 +223,7 @@ buck3_1v8: buck3 {
 				regulator-always-on;
 			};
 
-			buck4 {
+			buck4: buck4 {
 				regulator-min-microvolt = <500000>;
 				regulator-max-microvolt = <3300000>;
 				regulator-ramp-delay = <5000>;
@@ -242,7 +244,7 @@ buck6 {
 				regulator-always-on;
 			};
 
-			aldo1 {
+			aldo1: aldo1 {
 				regulator-min-microvolt = <500000>;
 				regulator-max-microvolt = <3400000>;
 				regulator-boot-on;
@@ -374,3 +376,21 @@ hub_3_0: hub at 2 {
 		reset-gpios = <&gpio K1_GPIO(124) GPIO_ACTIVE_LOW>;
 	};
 };
+
+&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 | GPIO_PULL_UP)>;
+	no-mmc;
+	no-sdio;
+	disable-wp;
+	cap-sd-highspeed;
+	vmmc-supply = <&buck4>;
+	vqmmc-supply = <&aldo1>;
+	sd-uhs-sdr25;
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+	status = "okay";
+};

-- 
2.54.0