mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-13 16:37:30 +00:00
0b60111aa6
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>
46 lines
891 B
C
46 lines
891 B
C
/*
|
|
* Copyright (c) 2016 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#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)
|
|
{
|
|
struct pwm_ops *ops = pwm_get_ops(dev);
|
|
|
|
if (!ops->set_config)
|
|
return -ENOSYS;
|
|
|
|
return ops->set_config(dev, channel, period_ns, duty_ns);
|
|
}
|
|
|
|
int pwm_set_enable(struct udevice *dev, uint channel, bool enable)
|
|
{
|
|
struct pwm_ops *ops = pwm_get_ops(dev);
|
|
|
|
if (!ops->set_enable)
|
|
return -ENOSYS;
|
|
|
|
return ops->set_enable(dev, channel, enable);
|
|
}
|
|
|
|
UCLASS_DRIVER(pwm) = {
|
|
.id = UCLASS_PWM,
|
|
.name = "pwm",
|
|
};
|