mirror of
https://github.com/smaeul/u-boot.git
synced 2025-11-04 05:50:17 +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>
91 lines
2.3 KiB
C
91 lines
2.3 KiB
C
/*
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* header file for pwm driver.
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*
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* Copyright 2016 Google Inc.
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* Copyright (c) 2011 samsung electronics
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* Donghwa Lee <dh09.lee@samsung.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _pwm_h_
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#define _pwm_h_
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/* struct pwm_ops: Operations for the PWM uclass */
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struct pwm_ops {
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/**
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* set_config() - Set the PWM configuration
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*
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* @dev: PWM device to update
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* @channel: PWM channel to update
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* @period_ns: PWM period in nanoseconds
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* @duty_ns: PWM duty period in nanoseconds
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* @return 0 if OK, -ve on error
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*/
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int (*set_config)(struct udevice *dev, uint channel, uint period_ns,
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uint duty_ns);
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/**
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* set_enable() - Enable or disable the PWM
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*
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* @dev: PWM device to update
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* @channel: PWM channel to update
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* @enable: true to enable, false to disable
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* @return 0 if OK, -ve on error
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*/
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int (*set_enable)(struct udevice *dev, uint channel, bool enable);
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/**
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* set_invert() - Set the PWM invert
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*
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* @dev: PWM device to update
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* @channel: PWM channel to update
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* @polarity: true to invert, false to keep normal polarity
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* @return 0 if OK, -ve on error
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*/
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int (*set_invert)(struct udevice *dev, uint channel, bool polarity);
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};
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#define pwm_get_ops(dev) ((struct pwm_ops *)(dev)->driver->ops)
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/**
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* pwm_set_config() - Set the PWM configuration
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*
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* @dev: PWM device to update
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* @channel: PWM channel to update
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* @period_ns: PWM period in nanoseconds
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* @duty_ns: PWM duty period in nanoseconds
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* @return 0 if OK, -ve on error
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*/
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int pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
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uint duty_ns);
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/**
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* pwm_set_enable() - Enable or disable the PWM
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*
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* @dev: PWM device to update
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* @channel: PWM channel to update
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* @enable: true to enable, false to disable
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* @return 0 if OK, -ve on error
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*/
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int pwm_set_enable(struct udevice *dev, uint channel, bool enable);
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/**
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* pwm_set_invert() - Set pwm default polarity
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*
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* @dev: PWM device to update
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* @channel: PWM channel to update
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* @polarity: true to invert, false to keep normal polarity
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* @return 0 if OK, -ve on error
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*/
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int pwm_set_invert(struct udevice *dev, uint channel, bool polarity);
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/* Legacy interface */
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#ifndef CONFIG_DM_PWM
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int pwm_init (int pwm_id, int div, int invert);
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int pwm_config (int pwm_id, int duty_ns, int period_ns);
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int pwm_enable (int pwm_id);
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void pwm_disable (int pwm_id);
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#endif
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#endif /* _pwm_h_ */
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