[PATCH 2/2] imx: kontron-sl-mx8mm: Enable PCA9450 regulator driver and fix SD card access

[Frieder Schrempf <frieder@fris.de>]

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>
---
Hi Tom, sorry for another late fix. I just keep discovering things
that are broken.

Please note that this depends on a driver change in patch 1 of this
series.
---
 configs/kontron-sl-mx8mm_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configs/kontron-sl-mx8mm_defconfig b/configs/kontron-sl-mx8mm_defconfig
index 2e9d52522b2..727f99f0063 100644
--- a/configs/kontron-sl-mx8mm_defconfig
+++ b/configs/kontron-sl-mx8mm_defconfig
@@ -99,6 +99,7 @@ CONFIG_DM_PMIC=y
 CONFIG_DM_PMIC_PCA9450=y
 CONFIG_SPL_DM_PMIC_PCA9450=y
 CONFIG_DM_REGULATOR=y
+CONFIG_DM_REGULATOR_PCA9450=y
 CONFIG_DM_RTC=y
 CONFIG_RTC_RV8803=y
 CONFIG_CONS_INDEX=2
-- 
2.36.1