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/*
* Device driver for Hi6421 PMIC
*
* Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
* http://www.hisilicon.com
* Copyright (c) <2013-2017> Linaro Ltd.
* http://www.linaro.org
*
* Author: Guodong Xu <guodong.xu@linaro.org>
*
* 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.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/mfd/core.h>
#include <linux/mfd/hi6421-pmic.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
static const struct mfd_cell hi6421_devs[] = {
{ .name = "hi6421-regulator", },
};
static const struct mfd_cell hi6421v530_devs[] = {
{ .name = "hi6421v530-regulator", },
};
static const struct regmap_config hi6421_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 8,
.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
};
static const struct of_device_id of_hi6421_pmic_match[] = {
{
.compatible = "hisilicon,hi6421-pmic",
.data = (void *)HI6421
},
{
.compatible = "hisilicon,hi6421v530-pmic",
.data = (void *)HI6421_V530
},
{ },
};
MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
static int hi6421_pmic_probe(struct platform_device *pdev)
{
struct hi6421_pmic *pmic;
struct resource *res;
const struct of_device_id *id;
const struct mfd_cell *subdevs;
enum hi6421_type type;
void __iomem *base;
int n_subdevs, ret;
id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
if (!id)
return -EINVAL;
type = (enum hi6421_type)id->data;
pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
if (!pmic)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
&hi6421_regmap_config);
if (IS_ERR(pmic->regmap)) {
dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
PTR_ERR(pmic->regmap));
return PTR_ERR(pmic->regmap);
}
platform_set_drvdata(pdev, pmic);
switch (type) {
case HI6421:
/* set over-current protection debounce 8ms */
regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
(HI6421_OCP_DEB_SEL_MASK
| HI6421_OCP_EN_DEBOUNCE_MASK
| HI6421_OCP_AUTO_STOP_MASK),
(HI6421_OCP_DEB_SEL_8MS
| HI6421_OCP_EN_DEBOUNCE_ENABLE));
subdevs = hi6421_devs;
n_subdevs = ARRAY_SIZE(hi6421_devs);
break;
case HI6421_V530:
subdevs = hi6421v530_devs;
n_subdevs = ARRAY_SIZE(hi6421v530_devs);
break;
default:
dev_err(&pdev->dev, "Unknown device type %d\n",
(unsigned int)type);
return -EINVAL;
}
ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
subdevs, n_subdevs, NULL, 0, NULL);
if (ret) {
dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
return ret;
}
return 0;
}
static struct platform_driver hi6421_pmic_driver = {
.driver = {
.name = "hi6421_pmic",
.of_match_table = of_hi6421_pmic_match,
},
.probe = hi6421_pmic_probe,
};
module_platform_driver(hi6421_pmic_driver);
MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
MODULE_DESCRIPTION("Hi6421 PMIC driver");
MODULE_LICENSE("GPL v2");
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