The latest kernel PWM drivers enable the polarity settings. When system run from U-Boot to kerenl, if there are differences in polarity set or duty cycle, the PMW will re-init: close -> set polarity and duty cycle -> enable the PWM. The power supply controled by pwm regulator may have voltage shaking, which lead to the system not stable.
Signed-off-by: Elaine Zhang <[email protected]> Signed-off-by: Kever Yang <[email protected]> Acked-by: Simon Glass <[email protected]> --- Changes in v4: - Split patch into uclass and rockchip patch Changes in v3: - use bool type for polarity Changes in v2: - use pwm_set_invert() instead of pwm_set_init() - add comment for polarity drivers/power/regulator/pwm_regulator.c | 16 ++++++++++++++-- drivers/pwm/pwm-uclass.c | 10 ++++++++++ include/pwm.h | 19 +++++++++++++++++++ 3 files changed, 43 insertions(+), 2 deletions(-) Applied to u-boot-rockchip/next, thanks! _______________________________________________ U-Boot mailing list [email protected] https://lists.denx.de/listinfo/u-boot
