linux-stable/drivers/regulator/internal.h
Maciej Purski a085a31af5
regulator: core: Parse coupled regulators properties
On Odroid XU3/4 and other Exynos5422 based boards there is a case, that
different devices on the board are supplied by different regulators
with non-fixed voltages. If one of these devices temporarily requires
higher voltage, there might occur a situation that the spread between
devices' voltages is so high, that there is a risk of changing
'high' and 'low' states on the interconnection between devices powered
by those regulators.

Add new structure "coupling_desc" to regulator_dev, which contains
pointers to all coupled regulators including the owner of the structure,
number of coupled regulators and counter of currently resolved
regulators.

Add of_functions to parse all data needed in regulator coupling.
Provide method to check DTS data consistency. Check if each coupled
regulator's max_spread is equal and if their lists of regulators match.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-05-17 16:05:48 +09:00

116 lines
2.7 KiB
C

/*
* internal.h -- Voltage/Current Regulator framework internal code
*
* Copyright 2007, 2008 Wolfson Microelectronics PLC.
* Copyright 2008 SlimLogic Ltd.
*
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#ifndef __REGULATOR_INTERNAL_H
#define __REGULATOR_INTERNAL_H
#include <linux/suspend.h>
#define REGULATOR_STATES_NUM (PM_SUSPEND_MAX + 1)
struct regulator_voltage {
int min_uV;
int max_uV;
};
/*
* struct regulator
*
* One for each consumer device.
* @voltage - a voltage array for each state of runtime, i.e.:
* PM_SUSPEND_ON
* PM_SUSPEND_TO_IDLE
* PM_SUSPEND_STANDBY
* PM_SUSPEND_MEM
* PM_SUSPEND_MAX
*/
struct regulator {
struct device *dev;
struct list_head list;
unsigned int always_on:1;
unsigned int bypass:1;
int uA_load;
struct regulator_voltage voltage[REGULATOR_STATES_NUM];
const char *supply_name;
struct device_attribute dev_attr;
struct regulator_dev *rdev;
struct dentry *debugfs;
};
extern struct class regulator_class;
static inline struct regulator_dev *dev_to_rdev(struct device *dev)
{
return container_of(dev, struct regulator_dev, dev);
}
#ifdef CONFIG_OF
struct regulator_dev *of_find_regulator_by_node(struct device_node *np);
struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
const struct regulator_desc *desc,
struct regulator_config *config,
struct device_node **node);
struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev,
int index);
int of_get_n_coupled(struct regulator_dev *rdev);
bool of_check_coupling_data(struct regulator_dev *rdev);
#else
static inline struct regulator_dev *
of_find_regulator_by_node(struct device_node *np)
{
return NULL;
}
static inline struct regulator_init_data *
regulator_of_get_init_data(struct device *dev,
const struct regulator_desc *desc,
struct regulator_config *config,
struct device_node **node)
{
return NULL;
}
static inline struct regulator_dev *
of_parse_coupled_regulator(struct regulator_dev *rdev,
int index)
{
return NULL;
}
static inline int of_get_n_coupled(struct regulator_dev *rdev)
{
return 0;
}
static inline bool of_check_coupling_data(struct regulator_dev *rdev)
{
return false;
}
#endif
enum regulator_get_type {
NORMAL_GET,
EXCLUSIVE_GET,
OPTIONAL_GET,
MAX_GET_TYPE
};
struct regulator *_regulator_get(struct device *dev, const char *id,
enum regulator_get_type get_type);
#endif