iio: adc: stm32: fix a current leak by resetting pcsel before disabling vdda
authorFabrice Gasnier <fabrice.gasnier@foss.st.com>
Fri, 22 Oct 2021 12:19:29 +0000 (14:19 +0200)
committerJonathan Cameron <Jonathan.Cameron@huawei.com>
Wed, 17 Nov 2021 17:52:34 +0000 (17:52 +0000)
commitf711f28e71e965c0d1141c830fa7131b41abbe75
treef52e8da190e80a3b0d3f9bcbb03c18b898fb69b7
parentcd0082235783f814241a1c9483fb89e405f4f892
iio: adc: stm32: fix a current leak by resetting pcsel before disabling vdda

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@foss.st.com>
Reviewed-by: Olivier Moysan <olivier.moysan@foss.st.com>
Link: https://lore.kernel.org/r/1634905169-23762-1-git-send-email-fabrice.gasnier@foss.st.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
drivers/iio/adc/stm32-adc.c