drivers: pwm: fix compilation with CONFIG_PWM_CAPTURE=n

[henrikbrixandersen]

Fix compilation with pwm.h with CONFIG_PWM_CAPTURE=n.

Signed-off-by: Henrik Brix Andersen [email protected]

[henrikbrixandersen]

This fixes warnings like the following, as seen in https://buildkite.com/zephyr/zephyr/builds/17735#7b50a655-5ca5-486e-aa97-a598aae24df4:

In file included from /workdir/zephyr/drivers/led/led_pwm.c:15:
--
  | ../../../../../../include/drivers/pwm.h:211:19: error: 'pwm_pin_configure_capture' declared 'static' but never defined [-Werror=unused-function]
  | 211 \| static inline int pwm_pin_configure_capture(const struct device *dev,
  | \|                   ^~~~~~~~~~~~~~~~~~~~~~~~~
  | cc1: all warnings being treated as errors

Not sure why this wasn't caught in CI on #26025.

[pabigot]

But doesn't this remove the anchor to which the documentation attaches, so it won't be documented?

[pabigot]

I think if the prototype removes static inline it might work. I'm testing it in #31265 as well; see https://github.com/zephyrproject-rtos/zephyr/compare/e3d115573a9389e965c660693b9b0ce07cfc3301..57e3821567f4fe685a5b865269254007198d2db2

[henrikbrixandersen]

@pabigot No, the documentation build still gets the correct result. I already tried several permutations of inline, static, __unused etc. without any luck.

[pabigot]

Ah: that's because you have CONFIG_PWM_CAPTURE in the doxygen predefines. OK.