tree 4ad3d7082201ff0399725c80c99304f9620289d6
parent 3af0bdd1d027292d40c7f1d13420bc298b3e1660
author Fabrice Gasnier <fabrice.gasnier@st.com> 1518602673 +0100
committer Thierry Reding <thierry.reding@gmail.com> 1522190257 +0200

pwm: stm32: Protect common prescaler for all channels

There may be a race, when configuring two PWM channels, with different
prescaler values, when there's no active channel yet.
Add mutex lock to avoid concurrent access on PWM apply state.
This is also precursor patch for PWM capture support.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>