mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 08:31:55 +00:00
d9a861cce1
It's not always true that the device_node of regulator can be found at dev->of_node at the time when of_get_regulator_init_data() is being called, because in some cases the regulator nodes in device tree do not have 'struct device' behind them until regulator_dev gets created for it by core function regulator_register(). The patch adds device_node as a new parameter to of_get_regulator_init_data(), so that caller can pass in the node of regulator directly. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Liam Girdwood <lrg@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/*
|
|
* OF helpers for regulator framework
|
|
*
|
|
* Copyright (C) 2011 Texas Instruments, Inc.
|
|
* Rajendra Nayak <rnayak@ti.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.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
#include <linux/regulator/machine.h>
|
|
|
|
static void of_get_regulation_constraints(struct device_node *np,
|
|
struct regulator_init_data **init_data)
|
|
{
|
|
const __be32 *min_uV, *max_uV, *uV_offset;
|
|
const __be32 *min_uA, *max_uA;
|
|
struct regulation_constraints *constraints = &(*init_data)->constraints;
|
|
|
|
constraints->name = of_get_property(np, "regulator-name", NULL);
|
|
|
|
min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
|
|
if (min_uV)
|
|
constraints->min_uV = be32_to_cpu(*min_uV);
|
|
max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
|
|
if (max_uV)
|
|
constraints->max_uV = be32_to_cpu(*max_uV);
|
|
|
|
/* Voltage change possible? */
|
|
if (constraints->min_uV != constraints->max_uV)
|
|
constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
|
|
/* Only one voltage? Then make sure it's set. */
|
|
if (constraints->min_uV == constraints->max_uV)
|
|
constraints->apply_uV = true;
|
|
|
|
uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
|
|
if (uV_offset)
|
|
constraints->uV_offset = be32_to_cpu(*uV_offset);
|
|
min_uA = of_get_property(np, "regulator-min-microamp", NULL);
|
|
if (min_uA)
|
|
constraints->min_uA = be32_to_cpu(*min_uA);
|
|
max_uA = of_get_property(np, "regulator-max-microamp", NULL);
|
|
if (max_uA)
|
|
constraints->max_uA = be32_to_cpu(*max_uA);
|
|
|
|
/* Current change possible? */
|
|
if (constraints->min_uA != constraints->max_uA)
|
|
constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
|
|
|
|
if (of_find_property(np, "regulator-boot-on", NULL))
|
|
constraints->boot_on = true;
|
|
|
|
if (of_find_property(np, "regulator-always-on", NULL))
|
|
constraints->always_on = true;
|
|
else /* status change should be possible if not always on. */
|
|
constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
|
|
}
|
|
|
|
/**
|
|
* of_get_regulator_init_data - extract regulator_init_data structure info
|
|
* @dev: device requesting for regulator_init_data
|
|
*
|
|
* Populates regulator_init_data structure by extracting data from device
|
|
* tree node, returns a pointer to the populated struture or NULL if memory
|
|
* alloc fails.
|
|
*/
|
|
struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
|
|
struct device_node *node)
|
|
{
|
|
struct regulator_init_data *init_data;
|
|
|
|
if (!node)
|
|
return NULL;
|
|
|
|
init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
|
|
if (!init_data)
|
|
return NULL; /* Out of memory? */
|
|
|
|
of_get_regulation_constraints(node, &init_data);
|
|
return init_data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
|