mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 13:36:44 +07:00
7299ab70e6
This patch adds helpers to support device tree bindings for the generic PWM API. Device tree binding documentation for PWM controllers is also provided. Acked-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
149 lines
3.4 KiB
C
149 lines
3.4 KiB
C
#ifndef __LINUX_PWM_H
|
|
#define __LINUX_PWM_H
|
|
|
|
#include <linux/of.h>
|
|
|
|
struct pwm_device;
|
|
struct seq_file;
|
|
|
|
/*
|
|
* pwm_request - request a PWM device
|
|
*/
|
|
struct pwm_device *pwm_request(int pwm_id, const char *label);
|
|
|
|
/*
|
|
* pwm_free - free a PWM device
|
|
*/
|
|
void pwm_free(struct pwm_device *pwm);
|
|
|
|
/*
|
|
* pwm_config - change a PWM device configuration
|
|
*/
|
|
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
|
|
|
|
/*
|
|
* pwm_enable - start a PWM output toggling
|
|
*/
|
|
int pwm_enable(struct pwm_device *pwm);
|
|
|
|
/*
|
|
* pwm_disable - stop a PWM output toggling
|
|
*/
|
|
void pwm_disable(struct pwm_device *pwm);
|
|
|
|
#ifdef CONFIG_PWM
|
|
struct pwm_chip;
|
|
|
|
enum {
|
|
PWMF_REQUESTED = 1 << 0,
|
|
PWMF_ENABLED = 1 << 1,
|
|
};
|
|
|
|
struct pwm_device {
|
|
const char *label;
|
|
unsigned long flags;
|
|
unsigned int hwpwm;
|
|
unsigned int pwm;
|
|
struct pwm_chip *chip;
|
|
void *chip_data;
|
|
|
|
unsigned int period; /* in nanoseconds */
|
|
};
|
|
|
|
static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
|
|
{
|
|
if (pwm)
|
|
pwm->period = period;
|
|
}
|
|
|
|
static inline unsigned int pwm_get_period(struct pwm_device *pwm)
|
|
{
|
|
return pwm ? pwm->period : 0;
|
|
}
|
|
|
|
/**
|
|
* struct pwm_ops - PWM controller operations
|
|
* @request: optional hook for requesting a PWM
|
|
* @free: optional hook for freeing a PWM
|
|
* @config: configure duty cycles and period length for this PWM
|
|
* @enable: enable PWM output toggling
|
|
* @disable: disable PWM output toggling
|
|
* @dbg_show: optional routine to show contents in debugfs
|
|
* @owner: helps prevent removal of modules exporting active PWMs
|
|
*/
|
|
struct pwm_ops {
|
|
int (*request)(struct pwm_chip *chip,
|
|
struct pwm_device *pwm);
|
|
void (*free)(struct pwm_chip *chip,
|
|
struct pwm_device *pwm);
|
|
int (*config)(struct pwm_chip *chip,
|
|
struct pwm_device *pwm,
|
|
int duty_ns, int period_ns);
|
|
int (*enable)(struct pwm_chip *chip,
|
|
struct pwm_device *pwm);
|
|
void (*disable)(struct pwm_chip *chip,
|
|
struct pwm_device *pwm);
|
|
#ifdef CONFIG_DEBUG_FS
|
|
void (*dbg_show)(struct pwm_chip *chip,
|
|
struct seq_file *s);
|
|
#endif
|
|
struct module *owner;
|
|
};
|
|
|
|
/**
|
|
* struct pwm_chip - abstract a PWM controller
|
|
* @dev: device providing the PWMs
|
|
* @list: list node for internal use
|
|
* @ops: callbacks for this PWM controller
|
|
* @base: number of first PWM controlled by this chip
|
|
* @npwm: number of PWMs controlled by this chip
|
|
* @pwms: array of PWM devices allocated by the framework
|
|
*/
|
|
struct pwm_chip {
|
|
struct device *dev;
|
|
struct list_head list;
|
|
const struct pwm_ops *ops;
|
|
int base;
|
|
unsigned int npwm;
|
|
|
|
struct pwm_device *pwms;
|
|
|
|
struct pwm_device * (*of_xlate)(struct pwm_chip *pc,
|
|
const struct of_phandle_args *args);
|
|
unsigned int of_pwm_n_cells;
|
|
};
|
|
|
|
int pwm_set_chip_data(struct pwm_device *pwm, void *data);
|
|
void *pwm_get_chip_data(struct pwm_device *pwm);
|
|
|
|
int pwmchip_add(struct pwm_chip *chip);
|
|
int pwmchip_remove(struct pwm_chip *chip);
|
|
struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
|
|
unsigned int index,
|
|
const char *label);
|
|
|
|
struct pwm_device *pwm_get(struct device *dev, const char *consumer);
|
|
void pwm_put(struct pwm_device *pwm);
|
|
|
|
struct pwm_lookup {
|
|
struct list_head list;
|
|
const char *provider;
|
|
unsigned int index;
|
|
const char *dev_id;
|
|
const char *con_id;
|
|
};
|
|
|
|
#define PWM_LOOKUP(_provider, _index, _dev_id, _con_id) \
|
|
{ \
|
|
.provider = _provider, \
|
|
.index = _index, \
|
|
.dev_id = _dev_id, \
|
|
.con_id = _con_id, \
|
|
}
|
|
|
|
void pwm_add_table(struct pwm_lookup *table, size_t num);
|
|
|
|
#endif
|
|
|
|
#endif /* __LINUX_PWM_H */
|