include/pwm.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * header file for pwm driver.
   4  *
   5  * Copyright 2016 Google Inc.
   6  * Copyright (c) 2011 samsung electronics
   7  * Donghwa Lee <dh09.lee@samsung.com>
   8  */
   9
  10 #ifndef _pwm_h_
  11 #define _pwm_h_
  12
  13 struct udevice;
  14
  15 /* struct pwm_ops: Operations for the PWM uclass */
  16 struct pwm_ops {
  17         /**
  18          * set_config() - Set the PWM configuration
  19          *
  20          * Change both the PWM device's period and it's duty period if
  21          * possible. Otherwise, set an appropriate duty period that best
  22          * matches the given period_ns / duty_ns ratio for the device.
  23          *
  24          * @dev:        PWM device to update
  25          * @channel:    PWM channel to update
  26          * @period_ns:  PWM period in nanoseconds
  27          * @duty_ns:    PWM duty period in nanoseconds
  28          * @return 0 if OK, -ve on error
  29          */
  30         int (*set_config)(struct udevice *dev, uint channel, uint period_ns,
  31                           uint duty_ns);
  32
  33         /**
  34          * set_enable() - Enable or disable the PWM
  35          *
  36          * @dev:        PWM device to update
  37          * @channel:    PWM channel to update
  38          * @enable:     true to enable, false to disable
  39          * @return 0 if OK, -ve on error
  40          */
  41         int (*set_enable)(struct udevice *dev, uint channel, bool enable);
  42         /**
  43          * set_invert() - Set the PWM invert
  44          *
  45          * @dev:        PWM device to update
  46          * @channel:    PWM channel to update
  47          * @polarity:   true to invert, false to keep normal polarity
  48          * @return 0 if OK, -ve on error
  49          */
  50         int (*set_invert)(struct udevice *dev, uint channel, bool polarity);
  51 };
  52
  53 #define pwm_get_ops(dev)        ((struct pwm_ops *)(dev)->driver->ops)
  54
  55 /**
  56  * pwm_set_config() - Set the PWM configuration
  57  *
  58  * Change both the PWM device's period and it's duty period if
  59  * possible. Otherwise, set an appropriate duty period that best
  60  * matches the given period_ns / duty_ns ratio for the device.
  61  *
  62  * @dev:        PWM device to update
  63  * @channel:    PWM channel to update
  64  * @period_ns:  PWM period in nanoseconds
  65  * @duty_ns:    PWM duty period in nanoseconds
  66  * Return: 0 if OK, -ve on error
  67  */
  68 int pwm_set_config(struct udevice *dev, uint channel, uint period_ns,
  69                    uint duty_ns);
  70
  71 /**
  72  * pwm_set_enable() - Enable or disable the PWM
  73  *
  74  * @dev:        PWM device to update
  75  * @channel:    PWM channel to update
  76  * @enable:     true to enable, false to disable
  77  * Return: 0 if OK, -ve on error
  78  */
  79 int pwm_set_enable(struct udevice *dev, uint channel, bool enable);
  80
  81 /**
  82  * pwm_set_invert() - Set pwm default polarity
  83  *
  84  * @dev:        PWM device to update
  85  * @channel:    PWM channel to update
  86  * @polarity:   true to invert, false to keep normal polarity
  87  * Return: 0 if OK, -ve on error
  88  */
  89 int pwm_set_invert(struct udevice *dev, uint channel, bool polarity);
  90
  91 /* Legacy interface */
  92 #ifndef CONFIG_DM_PWM
  93 int     pwm_init                (int pwm_id, int div, int invert);
  94 int     pwm_config              (int pwm_id, int duty_ns, int period_ns);
  95 int     pwm_enable              (int pwm_id);
  96 void    pwm_disable             (int pwm_id);
  97 #endif
  98
  99 #endif /* _pwm_h_ */