1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Device driver for Hi6421 PMIC
  4 *
  5 * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
  6 *              http://www.hisilicon.com
  7 * Copyright (c) <2013-2017> Linaro Ltd.
  8 *              https://www.linaro.org
  9 *
 10 * Author: Guodong Xu <guodong.xu@linaro.org>
 11 */
 12
 13#include <linux/device.h>
 14#include <linux/err.h>
 15#include <linux/mfd/core.h>
 16#include <linux/mfd/hi6421-pmic.h>
 17#include <linux/module.h>
 18#include <linux/of.h>
 19#include <linux/platform_device.h>
 20#include <linux/property.h>
 21#include <linux/regmap.h>
 22
 23static const struct mfd_cell hi6421_devs[] = {
 24	{ .name = "hi6421-regulator", },
 25};
 26
 27static const struct mfd_cell hi6421v530_devs[] = {
 28	{ .name = "hi6421v530-regulator", },
 29};
 30
 31static const struct regmap_config hi6421_regmap_config = {
 32	.reg_bits = 32,
 33	.reg_stride = 4,
 34	.val_bits = 8,
 35	.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
 36};
 37
 38static const struct of_device_id of_hi6421_pmic_match[] = {
 39	{
 40		.compatible = "hisilicon,hi6421-pmic",
 41		.data = (void *)HI6421
 42	},
 43	{
 44		.compatible = "hisilicon,hi6421v530-pmic",
 45		.data = (void *)HI6421_V530
 46	},
 47	{ },
 48};
 49MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
 50
 51static int hi6421_pmic_probe(struct platform_device *pdev)
 52{
 53	struct hi6421_pmic *pmic;
 54	const struct mfd_cell *subdevs;
 55	enum hi6421_type type;
 56	void __iomem *base;
 57	int n_subdevs, ret;
 58
 59	type = (uintptr_t)device_get_match_data(&pdev->dev);
 60
 61	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
 62	if (!pmic)
 63		return -ENOMEM;
 64
 65	base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 66	if (IS_ERR(base))
 67		return PTR_ERR(base);
 68
 69	pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
 70						 &hi6421_regmap_config);
 71	if (IS_ERR(pmic->regmap)) {
 72		dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
 73						PTR_ERR(pmic->regmap));
 74		return PTR_ERR(pmic->regmap);
 75	}
 76
 77	platform_set_drvdata(pdev, pmic);
 78
 79	switch (type) {
 80	case HI6421:
 81		/* set over-current protection debounce 8ms */
 82		regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
 83				(HI6421_OCP_DEB_SEL_MASK
 84				 | HI6421_OCP_EN_DEBOUNCE_MASK
 85				 | HI6421_OCP_AUTO_STOP_MASK),
 86				(HI6421_OCP_DEB_SEL_8MS
 87				 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
 88
 89		subdevs = hi6421_devs;
 90		n_subdevs = ARRAY_SIZE(hi6421_devs);
 91		break;
 92	case HI6421_V530:
 93		subdevs = hi6421v530_devs;
 94		n_subdevs = ARRAY_SIZE(hi6421v530_devs);
 95		break;
 96	default:
 97		dev_err(&pdev->dev, "Unknown device type %d\n",
 98						(unsigned int)type);
 99		return -EINVAL;
100	}
101
102	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
103				   subdevs, n_subdevs, NULL, 0, NULL);
104	if (ret) {
105		dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
106		return ret;
107	}
108
109	return 0;
110}
111
112static struct platform_driver hi6421_pmic_driver = {
113	.driver = {
114		.name = "hi6421_pmic",
115		.of_match_table = of_hi6421_pmic_match,
116	},
117	.probe	= hi6421_pmic_probe,
118};
119module_platform_driver(hi6421_pmic_driver);
120
121MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
122MODULE_DESCRIPTION("Hi6421 PMIC driver");
123MODULE_LICENSE("GPL v2");