On Fri, Dec 17, 2021 at 11:56:32AM +0100, Fabrice Gasnier wrote:
> commit f711f28e71e965c0d1141c830fa7131b41abbe75 upstream.
>
> Some I/Os are connected to ADC input channels, when the corresponding bit
> in PCSEL register are set on STM32H7 and STM32MP15. This is done in the
> prepare routine of stm32-adc driver.
> There are constraints here, as PCSEL shouldn't be set when VDDA supply
> is disabled. Enabling/disabling of VDDA supply in done via stm32-adc-core
> runtime PM routines (before/after ADC is enabled/disabled).
>
> Currently, PCSEL remains set when disabling ADC. Later on, PM runtime
> can disable the VDDA supply. This creates some conditions on I/Os that
> can start to leak current.
> So PCSEL needs to be cleared when disabling the ADC.
>
> Fixes: 95e339b6e85d ("iio: adc: stm32: add support for STM32H7")
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxxxxxxx>
> Reviewed-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
> Link: https://lore.kernel.org/r/1634905169-23762-1-git-send-email-fabrice.gasnier@xxxxxxxxxxx
> Cc: <Stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> ---
> Backport for 5.4-stable
Now queued up, thanks.
greg k-h
