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pwm: Implement some checks for lowlevel drivers

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There are some expectations which the callbacks provided by lowlevel
drivers should fulfill. Implement checks that help driver authors to get
these semantics right. As these have some overhead the checks can be
disabled using a Kconfig setting.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König
2020-02-10 22:35:18 +01:00
committed by Thierry Reding
parent 2cb5cd90f4
commit 3ad1f3a332
3 changed files with 140 additions and 8 deletions
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drivers/pwm/Kconfig
+9
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@@ -33,6 +33,15 @@ config PWM_SYSFS
bool
default y if SYSFS
config PWM_DEBUG
bool "PWM lowlevel drivers additional checks and debug messages"
depends on DEBUG_KERNEL
help
This option enables some additional checks to help lowlevel driver
authors to get their callbacks implemented correctly.
It is expected to introduce some runtime overhead and diagnostic
output to the kernel log, so only enable while working on a driver.
config PWM_AB8500
tristate "AB8500 PWM support"
depends on AB8500_CORE && ARCH_U8500