mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 21:30:54 +07:00
31e54086dd
Implementation of the regulator framework driver for the Versatile Express voltage control. Devices without voltage constraints (ie. "regulator-[min|max]-microvolt" properties in the DT node) are treated as fixed (or rather read-only) regulators. Signed-off-by: Pawel Moll <pawel.moll@arm.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* Copyright (C) 2012 ARM Limited
|
|
*/
|
|
|
|
#define DRVNAME "vexpress-regulator"
|
|
#define pr_fmt(fmt) DRVNAME ": " fmt
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include <linux/regulator/machine.h>
|
|
#include <linux/regulator/of_regulator.h>
|
|
#include <linux/vexpress.h>
|
|
|
|
struct vexpress_regulator {
|
|
struct regulator_desc desc;
|
|
struct regulator_dev *regdev;
|
|
struct vexpress_config_func *func;
|
|
};
|
|
|
|
static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
|
|
{
|
|
struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
|
|
u32 uV;
|
|
int err = vexpress_config_read(reg->func, 0, &uV);
|
|
|
|
return err ? err : uV;
|
|
}
|
|
|
|
static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
|
|
int min_uV, int max_uV, unsigned *selector)
|
|
{
|
|
struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
|
|
|
|
return vexpress_config_write(reg->func, 0, min_uV);
|
|
}
|
|
|
|
static struct regulator_ops vexpress_regulator_ops_ro = {
|
|
.get_voltage = vexpress_regulator_get_voltage,
|
|
};
|
|
|
|
static struct regulator_ops vexpress_regulator_ops = {
|
|
.get_voltage = vexpress_regulator_get_voltage,
|
|
.set_voltage = vexpress_regulator_set_voltage,
|
|
};
|
|
|
|
static int vexpress_regulator_probe(struct platform_device *pdev)
|
|
{
|
|
int err;
|
|
struct vexpress_regulator *reg;
|
|
struct regulator_init_data *init_data;
|
|
struct regulator_config config = { };
|
|
|
|
reg = devm_kzalloc(&pdev->dev, sizeof(*reg), GFP_KERNEL);
|
|
if (!reg) {
|
|
err = -ENOMEM;
|
|
goto error_kzalloc;
|
|
}
|
|
|
|
reg->func = vexpress_config_func_get_by_dev(&pdev->dev);
|
|
if (!reg->func) {
|
|
err = -ENXIO;
|
|
goto error_get_func;
|
|
}
|
|
|
|
reg->desc.name = dev_name(&pdev->dev);
|
|
reg->desc.type = REGULATOR_VOLTAGE;
|
|
reg->desc.owner = THIS_MODULE;
|
|
reg->desc.continuous_voltage_range = true;
|
|
|
|
init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node);
|
|
if (!init_data) {
|
|
err = -EINVAL;
|
|
goto error_get_regulator_init_data;
|
|
}
|
|
|
|
init_data->constraints.apply_uV = 0;
|
|
if (init_data->constraints.min_uV && init_data->constraints.max_uV)
|
|
reg->desc.ops = &vexpress_regulator_ops;
|
|
else
|
|
reg->desc.ops = &vexpress_regulator_ops_ro;
|
|
|
|
config.dev = &pdev->dev;
|
|
config.init_data = init_data;
|
|
config.driver_data = reg;
|
|
config.of_node = pdev->dev.of_node;
|
|
|
|
reg->regdev = regulator_register(®->desc, &config);
|
|
if (IS_ERR(reg->regdev)) {
|
|
err = PTR_ERR(reg->regdev);
|
|
goto error_regulator_register;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, reg);
|
|
|
|
return 0;
|
|
|
|
error_regulator_register:
|
|
error_get_regulator_init_data:
|
|
vexpress_config_func_put(reg->func);
|
|
error_get_func:
|
|
error_kzalloc:
|
|
return err;
|
|
}
|
|
|
|
static int __devexit vexpress_regulator_remove(struct platform_device *pdev)
|
|
{
|
|
struct vexpress_regulator *reg = platform_get_drvdata(pdev);
|
|
|
|
vexpress_config_func_put(reg->func);
|
|
regulator_unregister(reg->regdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id vexpress_regulator_of_match[] = {
|
|
{ .compatible = "arm,vexpress-volt", },
|
|
};
|
|
|
|
static struct platform_driver vexpress_regulator_driver = {
|
|
.probe = vexpress_regulator_probe,
|
|
.remove = __devexit_p(vexpress_regulator_remove),
|
|
.driver = {
|
|
.name = DRVNAME,
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = vexpress_regulator_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(vexpress_regulator_driver);
|
|
|
|
MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
|
|
MODULE_DESCRIPTION("Versatile Express regulator");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:vexpress-regulator");
|