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dm: pwm: Add a PWM uclass

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Add a uclass that supports Pulse Width Modulation (PWM) devices. It
provides methods to enable/disable and configure the device.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-01-21 19:44:54 -07:00
parent d4bf91ada1
commit fc760cb8c4
6 changed files with 103 additions and 0 deletions
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53
include/pwm.h
View file

@ -1,6 +1,7 @@
/*
* header file for pwm driver.
*
* Copyright 2016 Google Inc.
* Copyright (c) 2011 samsung electronics
* Donghwa Lee <dh09.lee@samsung.com>
*
@ -10,9 +11,61 @@
#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);
};
#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);
/* 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_ */