Alper Nebi Yasak 1b9ee2882e pwm: Add a driver for Chrome OS EC PWM ... This PWM is used in rk3399-gru-bob and rk3399-gru-kevin to control the display brightness. We can only change the duty cycle, so on set_config() we just try to match the duty cycle that dividing duty_ns by period_ns gives us. To disable, we set the duty cycle to zero while keeping the old value for when we want to re-enable it. The cros_ec_set_pwm_duty() function is taken from Depthcharge's cros_ec_set_bl_pwm_duty() but modified to use the generic pwm type. The driver itself is very loosely based on rk_pwm.c for the general pwm driver structure. The devicetree binding file is from Linux, before it was converted to YAML at 5df5a577a6b4 ("dt-bindings: pwm: Convert google,cros-ec-pwm.txt to YAML format") in their repo. Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>		2021-04-10 16:08:39 +02:00
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cros-ec-pwm.txt	pwm: Add a driver for Chrome OS EC PWM	2021-04-10 16:08:39 +02:00
pwm-sifive.txt	pwm: Add DT documentation for SiFive PWM Controller	2020-07-09 06:03:02 +02:00
pwm.txt	doc: dtbinding: add pwm binding file	2017-05-10 13:37:21 -06:00
tegra20-pwm.txt