diff options
| author | Kever Yang <kever.yang@rock-chips.com> | 2017-04-24 02:27:49 (GMT) |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2017-05-10 19:37:21 (GMT) |
| commit | 0b60111aa66f51d05473a375070ca72d073a6fd3 (patch) | |
| tree | 48068d473dd00ed00a70b4a68cc956a04f049a62 /include/pwm.h | |
| parent | a66726838e9227ea8b9c6a1402d6ca89384c1b56 (diff) | |
| download | u-boot-fsl-qoriq-0b60111aa66f51d05473a375070ca72d073a6fd3.tar.xz | |
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 'include/pwm.h')
| -rw-r--r-- | include/pwm.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/pwm.h b/include/pwm.h index 851915e..ebee227 100644 --- a/include/pwm.h +++ b/include/pwm.h @@ -34,6 +34,15 @@ struct pwm_ops { * @return 0 if OK, -ve on error */ int (*set_enable)(struct udevice *dev, uint channel, bool enable); + /** + * set_invert() - Set the PWM invert + * + * @dev: PWM device to update + * @channel: PWM channel to update + * @polarity: true to invert, false to keep normal polarity + * @return 0 if OK, -ve on error + */ + int (*set_invert)(struct udevice *dev, uint channel, bool polarity); }; #define pwm_get_ops(dev) ((struct pwm_ops *)(dev)->driver->ops) @@ -60,6 +69,16 @@ int pwm_set_config(struct udevice *dev, uint channel, uint period_ns, */ int pwm_set_enable(struct udevice *dev, uint channel, bool enable); +/** + * pwm_set_invert() - Set pwm default polarity + * + * @dev: PWM device to update + * @channel: PWM channel to update + * @polarity: true to invert, false to keep normal polarity + * @return 0 if OK, -ve on error + */ +int pwm_set_invert(struct udevice *dev, uint channel, bool polarity); + /* Legacy interface */ #ifndef CONFIG_DM_PWM int pwm_init (int pwm_id, int div, int invert); |