On Mon, Jun 27, 2022 at 8:01 AM Frieder Schrempf frieder@fris.de wrote:
From: Frieder Schrempf frieder.schrempf@kontron.de
Currently accessing the SD card on USDHC2 fails with:
=> mmc dev 1 Card did not respond to voltage select! : -110
This is due to the fact that UHS modes are enabled in the defconfig and the devicetree, but the referenced LDO5 regulator (reg_nvcc_sd) is not available to switch the data lines from 3.3V to 1.8V mode.
By enabling the regulator driver the vqmmc-supply is now available and the SD card works also in high speed modes:
=> mmc dev 1 switch to partitions #0, OK mmc1 is current device
Please note that the board has a GPIO connected to the SD_VSEL signal of the PMIC. As the driver uses the LDO5CTRL_H register to set the voltage, we need to make sure that this GPIO (GPIO01_IO4) is set to a high level.
Signed-off-by: Frieder Schrempf frieder.schrempf@kontron.de Reviewed-by: Fabio Estevam festevam@denx.de
Tested-by: Fabio Estevam festevam@denx.de