mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +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>
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
|
|
* header file for pwm driver.
|
|
*
|
|
* Copyright 2016 Google Inc.
|
|
* Copyright (c) 2011 samsung electronics
|
|
* Donghwa Lee <dh09.lee@samsung.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#ifndef _pwm_h_
|
|
#define _pwm_h_
|
|
|
|
/* struct pwm_ops: Operations for the PWM uclass */
|
|
struct pwm_ops {
|
|
/**
|
|
* set_config() - Set the PWM configuration
|
|
*
|
|
* @dev: PWM device to update
|
|
* @channel: PWM channel to update
|
|
* @period_ns: PWM period in nanoseconds
|
|
* @duty_ns: PWM duty period in nanoseconds
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int (*set_config)(struct udevice *dev, uint channel, uint period_ns,
|
|
uint duty_ns);
|
|
|
|
/**
|
|
* set_enable() - Enable or disable the PWM
|
|
*
|
|
* @dev: PWM device to update
|
|
* @channel: PWM channel to update
|
|
* @enable: true to enable, false to disable
|
|
* @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)
|
|
|
|
/**
|
|
* pwm_set_config() - Set the PWM configuration
|
|
*
|
|
* @dev: PWM device to update
|
|
* @channel: PWM channel to update
|
|
* @period_ns: PWM period in nanoseconds
|
|
* @duty_ns: PWM duty period in nanoseconds
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
int pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
|
|
uint duty_ns);
|
|
|
|
/**
|
|
* pwm_set_enable() - Enable or disable the PWM
|
|
*
|
|
* @dev: PWM device to update
|
|
* @channel: PWM channel to update
|
|
* @enable: true to enable, false to disable
|
|
* @return 0 if OK, -ve on error
|
|
*/
|
|
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);
|
|
int pwm_config (int pwm_id, int duty_ns, int period_ns);
|
|
int pwm_enable (int pwm_id);
|
|
void pwm_disable (int pwm_id);
|
|
#endif
|
|
|
|
#endif /* _pwm_h_ */
|