BootROM leave GPIO4_D6 configured as SDMMC_PWREN function and DW MCI
driver set PRWEN high on MMC_POWER_UP and low on MMC_POWER_OFF.
Similarly U-Boot also set PRWEN high before accessing mmc.
However, HW revision prior to v1.2 must pull GPIO4_D6 low to access
sdmmc. For HW revision v1.2 the state of GPIO4_D6 has no impact.
Model an always-on active low fixed regulator using GPIO4_D6 to fix
use of sdmmc on older HW revisions of the board.
Fixes: adeb5d2a4ba4 ("arm64: dts: rockchip: Add Radxa ROCK S0")
Signed-off-by: Jonas Karlman <jonas@xxxxxxxxx>
---
.../boot/dts/rockchip/rk3308-rock-s0.dts | 25 ++++++++++++++++++-
1 file changed, 24 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/rockchip/rk3308-rock-s0.dts b/arch/arm64/boot/dts/rockchip/rk3308-rock-s0.dts
index bd6419a5c20a..8311af4c8689 100644
--- a/arch/arm64/boot/dts/rockchip/rk3308-rock-s0.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3308-rock-s0.dts
@@ -74,6 +74,23 @@ vcc_io: regulator-3v3-vcc-io {
vin-supply = <&vcc5v0_sys>;
};
+ /*
+ * HW revision prior to v1.2 must pull GPIO4_D6 low to access sdmmc.
+ * This is modeled as an always-on active low fixed regulator.
+ */
+ vcc_sd: regulator-3v3-vcc-sd {
+ compatible = "regulator-fixed";
+ gpios = <&gpio4 RK_PD6 GPIO_ACTIVE_LOW>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&sdmmc_2030>;
+ regulator-name = "vcc_sd";
+ regulator-always-on;
+ regulator-boot-on;
+ regulator-min-microvolt = <3300000>;
+ regulator-max-microvolt = <3300000>;
+ vin-supply = <&vcc_io>;
+ };
+
vcc5v0_sys: regulator-5v0-vcc-sys {
compatible = "regulator-fixed";
regulator-name = "vcc5v0_sys";
@@ -181,6 +198,12 @@ pwr_led: pwr-led {
};
};
+ sdmmc {
+ sdmmc_2030: sdmmc-2030 {
+ rockchip,pins = <4 RK_PD6 RK_FUNC_GPIO &pcfg_pull_none>;
+ };
+ };
+
wifi {
wifi_reg_on: wifi-reg-on {
rockchip,pins = <0 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>;
@@ -233,7 +256,7 @@ &sdmmc {
cap-mmc-highspeed;
cap-sd-highspeed;
disable-wp;
- vmmc-supply = <&vcc_io>;
+ vmmc-supply = <&vcc_sd>;
status = "okay";
};
--
2.47.0
