regulator: stm32-vrefbuf: fix a possible overshoot when re-enabling

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commit 02fbabd5f4 upstream.

There maybe an overshoot, when disabling, then re-enabling vrefbuf
too quickly. VREFBUF is used by ADC/DAC on some boards. When re-enabling
too quickly, an overshoot on the reference voltage make the conversions
inaccurate for a short period of time.
- Don't put the VREFBUF in HiZ when disabling, to force an active
discharge.
- Enforce a 1ms OFF/ON delay

Fixes: 0cdbf481e9 ("regulator: Add support for stm32-vrefbuf")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Message-Id: <1583312132-20932-1-git-send-email-fabrice.gasnier@st.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Fabrice Gasnier 2020-03-04 09:55:32 +01:00 • committed by Greg Kroah-Hartman

parent 4ed9e8e426

commit 0419919076

1 changed files with 2 additions and 1 deletions

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drivers/regulator/stm32-vrefbuf.c

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