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| author | Kever Yang <kever.yang@rock-chips.com> | 2017-04-24 10:27:49 +0800 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2017-05-10 13:37:21 -0600 |
| commit | 0b60111aa66f51d05473a375070ca72d073a6fd3 (patch) | |
| tree | 48068d473dd00ed00a70b4a68cc956a04f049a62 /drivers/pwm | |
| parent | a66726838e9227ea8b9c6a1402d6ca89384c1b56 (diff) | |
| download | u-boot-0b60111aa66f51d05473a375070ca72d073a6fd3.zip u-boot-0b60111aa66f51d05473a375070ca72d073a6fd3.tar.gz u-boot-0b60111aa66f51d05473a375070ca72d073a6fd3.tar.bz2 | |
power: regulator: pwm: support pwm polarity setting
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 <zhangqing@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-uclass.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-uclass.c b/drivers/pwm/pwm-uclass.c index c2200af..69051fe 100644 --- a/drivers/pwm/pwm-uclass.c +++ b/drivers/pwm/pwm-uclass.c @@ -9,6 +9,16 @@ #include <dm.h> #include <pwm.h> +int pwm_set_invert(struct udevice *dev, uint channel, bool polarity) +{ + struct pwm_ops *ops = pwm_get_ops(dev); + + if (!ops->set_invert) + return -ENOSYS; + + return ops->set_invert(dev, channel, polarity); +} + int pwm_set_config(struct udevice *dev, uint channel, uint period_ns, uint duty_ns) { |