Hi Lucas,
Am 2021-09-14 10:20, schrieb Lucas Stach:
Am Dienstag, dem 14.09.2021 um 09:26 +0200 schrieb Heiko Thiery:
The sw4 output (V_1V8_S0 voltage) from the PMIC is the main supply for
the 1V8 power domain. It is not only used as supply for the eMMC.
So this voltage can not be changed and is not allowed to switched off.
Therefore we do not want to provide this regulator to the SDHC driver
to
control this voltage.
This specific requirement should not be solved by removing the
regulator connection from the SDHCI node, but instead by constraining
the regulator voltage range to a fixed 3.3V and marking the regulator
as always-on to reflect the hardware requirements in the DT.
Also if your eMMC vqmmc is a fixed 3.3V, I don't think you need the
faster pinctrl states, as you can't use the faster pin states anyways,
as they require a 1.8V signaling voltage.
Are you speaking of the 1.8V signalling modes? As far as I know the
IMX SDHC controller will switch the voltage by its own function pin.
That is, its not a GPIO.
-michael
