mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Heiko Stübner](/assets/img/avatar_default.png)
This patch adds support for regulators that can be controlled via gpios. Examples for such regulators are the TI-tps65024x voltage regulators with 4 fixed and 1 runtime-switchable voltage regulators or the TI-bq240XX charger regulators. The number of controlling gpios is not limited, the mapping between voltage/current and target gpio state is done via the states map and the driver can be used for either voltage or current regulators. A mapping for a regulator with two GPIOs could look like: gpios = { { .gpio = GPIO1, .flags = GPIOF_OUT_INIT_HIGH, .label = "gpio name 1" }, { .gpio = GPIO2, .flags = GPIOF_OUT_INIT_LOW, .label = "gpio name 2" }, } The flags element of the gpios array determines the initial state of the gpio, set during probe. The initial state of the regulator is also calculated from these values states = { { .value = volt_or_cur1, .gpios = (0 << 1) | (0 << 0) }, { .value = volt_or_cur2, .gpios = (0 << 1) | (1 << 0) }, { .value = volt_or_cur3, .gpios = (1 << 1) | (0 << 0) }, { .value = volt_or_cur4, .gpios = (1 << 1) | (1 << 0) }, } The target-state for the n-th gpio is determined by the n-th bit in the bitfield of the target-value. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/*
|
|
* gpio-regulator.h
|
|
*
|
|
* Copyright 2011 Heiko Stuebner <heiko@sntech.de>
|
|
*
|
|
* based on fixed.h
|
|
*
|
|
* Copyright 2008 Wolfson Microelectronics PLC.
|
|
*
|
|
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
*
|
|
* Copyright (c) 2009 Nokia Corporation
|
|
* Roger Quadros <ext-roger.quadros@nokia.com>
|
|
*
|
|
* 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_GPIO_H
|
|
#define __REGULATOR_GPIO_H
|
|
|
|
struct regulator_init_data;
|
|
|
|
enum regulator_type;
|
|
|
|
/**
|
|
* struct gpio_regulator_state - state description
|
|
* @value: microvolts or microamps
|
|
* @gpios: bitfield of gpio target-states for the value
|
|
*
|
|
* This structure describes a supported setting of the regulator
|
|
* and the necessary gpio-state to achieve it.
|
|
*
|
|
* The n-th bit in the bitfield describes the state of the n-th GPIO
|
|
* from the gpios-array defined in gpio_regulator_config below.
|
|
*/
|
|
struct gpio_regulator_state {
|
|
int value;
|
|
int gpios;
|
|
};
|
|
|
|
/**
|
|
* struct gpio_regulator_config - config structure
|
|
* @supply_name: Name of the regulator supply
|
|
* @enable_gpio: GPIO to use for enable control
|
|
* set to -EINVAL if not used
|
|
* @enable_high: Polarity of enable GPIO
|
|
* 1 = Active high, 0 = Active low
|
|
* @enabled_at_boot: Whether regulator has been enabled at
|
|
* boot or not. 1 = Yes, 0 = No
|
|
* This is used to keep the regulator at
|
|
* the default state
|
|
* @startup_delay: Start-up time in microseconds
|
|
* @gpios: Array containing the gpios needed to control
|
|
* the setting of the regulator
|
|
* @nr_gpios: Number of gpios
|
|
* @states: Array of gpio_regulator_state entries describing
|
|
* the gpio state for specific voltages
|
|
* @nr_states: Number of states available
|
|
* @regulator_type: either REGULATOR_CURRENT or REGULATOR_VOLTAGE
|
|
* @init_data: regulator_init_data
|
|
*
|
|
* This structure contains gpio-voltage regulator configuration
|
|
* information that must be passed by platform code to the
|
|
* gpio-voltage regulator driver.
|
|
*/
|
|
struct gpio_regulator_config {
|
|
const char *supply_name;
|
|
|
|
int enable_gpio;
|
|
unsigned enable_high:1;
|
|
unsigned enabled_at_boot:1;
|
|
unsigned startup_delay;
|
|
|
|
struct gpio *gpios;
|
|
int nr_gpios;
|
|
|
|
struct gpio_regulator_state *states;
|
|
int nr_states;
|
|
|
|
enum regulator_type type;
|
|
struct regulator_init_data *init_data;
|
|
};
|
|
|
|
#endif
|