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arm64: dts: rockchip: Fix sdmmc access on rk3308-rock-s0 v1.1 boards

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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@kwiboo.se>
Link: https://lore.kernel.org/r/20241119230838.4137130-1-jonas@kwiboo.se
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

[ upstream commit: 26c100232b09ced0857306ac9831a4fa9c9aa231 ]

(cherry picked from commit ca8e0bedbc790b19b11efc223677d178b8eeb74e)
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
This commit is contained in:
Jonas Karlman 2025-02-04 21:38:43 +00:00 • committed by Kever Yang
parent 8d25dbb725
commit d69097683d
1 changed files with 24 additions and 1 deletions
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25
dts/upstream/src/arm64/rockchip/rk3308-rock-s0.dts
View file

@ -74,6 +74,23 @@
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 @@
};
};
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 @@
cap-mmc-highspeed;
cap-sd-highspeed;
disable-wp;
vmmc-supply = <&vcc_io>;
vmmc-supply = <&vcc_sd>;
status = "okay";
};