Attaching GPIO functionality to SDMMC0_DET pin (which does in Linux base dts) make dwmmc driver "fail to detect the card".
Card did not respond to voltage select!
It may be because the existing driver can't support gpio card detection. So, change the pinctrl functionality from RK_FUNC_GPIO to RK_FUNC_1 like other rk3399 dts does via sdmmc_cd pin.
Add this change in -u-boot.dtsi so once we have a proper fix or more details we may drop it this in future.
Cc: Robin Murphy robin.murphy@arm.com Reviewed-by: Kever Yang kever.yang@rock-chips.com Signed-off-by: Jagan Teki jagan@amarulasolutions.com --- Changes for v8: - drop pinctrl-names - update proper commit
arch/arm/dts/rk3399-nanopi4-u-boot.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+) create mode 100644 arch/arm/dts/rk3399-nanopi4-u-boot.dtsi
diff --git a/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi b/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi new file mode 100644 index 0000000000..bb8bdf08c5 --- /dev/null +++ b/arch/arm/dts/rk3399-nanopi4-u-boot.dtsi @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2019 Jagan Teki jagan@amarulasolutions.com + */ + +&sdmmc { + pinctrl-0 = <&sdmmc_bus4 &sdmmc_clk &sdmmc_cmd &sdmmc_cd>; +};