reset: Add optional resets and stubs
This patch adds device_reset_optional and (devm_)reset_control_get_optional variants that drivers can use to indicate they can function without control over the reset line. For those functions, stubs are added so the drivers can be compiled with CONFIG_RESET_CONTROLLER disabled. Also, device_reset is annotated with __must_check. Drivers ignoring the return value should use device_reset_optional instead. Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de> Reviewed-by: NMaxime Ripard <maxime.ripard@free-electrons.com> Reviewed-by: NMarek Vasut <marex@denx.de> Acked-by: NWolfram Sang <wsa@the-dreams.de>
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