On Sun, Jun 07, 2020 at 08:18:34PM +0200, Hans de Goede wrote: > The pwm-crc code is using 2 different enable bits: > 1. bit 7 of the PWM0_CLK_DIV (PWM_OUTPUT_ENABLE) > 2. bit 0 of the BACKLIGHT_EN register > > So far we've kept the PWM_OUTPUT_ENABLE bit set when disabling the PWM, > this commit makes crc_pwm_disable() clear it on disable and makes > crc_pwm_enable() set it again on re-enable. > > This should disable the internal (divided) PWM clock and tri-state the > PWM output pin when disabled, saving some power. It would be great if you could also document that disabling the PWM makes the output tri-state. There are a few drivers that have a "Limitations" section at their top. Describing that there (in the same format) would be the right place. Also note that according to Thierry's conception getting a (driven) inactive output is the right thing for a disabled PWM. Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | https://www.pengutronix.de/ |
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