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_device.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21
22static const struct mfd_cell hi6421_devs[] = {
23	{ .name = "hi6421-regulator", },
24};
25
26static const struct mfd_cell hi6421v530_devs[] = {
27	{ .name = "hi6421v530-regulator", },
28};
29
30static const struct regmap_config hi6421_regmap_config = {
31	.reg_bits = 32,
32	.reg_stride = 4,
33	.val_bits = 8,
34	.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
35};
36
37static const struct of_device_id of_hi6421_pmic_match[] = {
38	{
39		.compatible = "hisilicon,hi6421-pmic",
40		.data = (void *)HI6421
41	},
42	{
43		.compatible = "hisilicon,hi6421v530-pmic",
44		.data = (void *)HI6421_V530
45	},
46	{ },
47};
48MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
49
50static int hi6421_pmic_probe(struct platform_device *pdev)
51{
52	struct hi6421_pmic *pmic;
53	struct resource *res;
54	const struct of_device_id *id;
55	const struct mfd_cell *subdevs;
56	enum hi6421_type type;
57	void __iomem *base;
58	int n_subdevs, ret;
59
60	id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
61	if (!id)
62		return -EINVAL;
63	type = (enum hi6421_type)id->data;
64
65	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
66	if (!pmic)
67		return -ENOMEM;
68
69	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
70	base = devm_ioremap_resource(&pdev->dev, res);
71	if (IS_ERR(base))
72		return PTR_ERR(base);
73
74	pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
75						 &hi6421_regmap_config);
76	if (IS_ERR(pmic->regmap)) {
77		dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
78						PTR_ERR(pmic->regmap));
79		return PTR_ERR(pmic->regmap);
80	}
81
82	platform_set_drvdata(pdev, pmic);
83
84	switch (type) {
85	case HI6421:
86		/* set over-current protection debounce 8ms */
87		regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
88				(HI6421_OCP_DEB_SEL_MASK
89				 | HI6421_OCP_EN_DEBOUNCE_MASK
90				 | HI6421_OCP_AUTO_STOP_MASK),
91				(HI6421_OCP_DEB_SEL_8MS
92				 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
93
94		subdevs = hi6421_devs;
95		n_subdevs = ARRAY_SIZE(hi6421_devs);
96		break;
97	case HI6421_V530:
98		subdevs = hi6421v530_devs;
99		n_subdevs = ARRAY_SIZE(hi6421v530_devs);
100		break;
101	default:
102		dev_err(&pdev->dev, "Unknown device type %d\n",
103						(unsigned int)type);
104		return -EINVAL;
105	}
106
107	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
108				   subdevs, n_subdevs, NULL, 0, NULL);
109	if (ret) {
110		dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
111		return ret;
112	}
113
114	return 0;
115}
116
117static struct platform_driver hi6421_pmic_driver = {
118	.driver = {
119		.name = "hi6421_pmic",
120		.of_match_table = of_hi6421_pmic_match,
121	},
122	.probe	= hi6421_pmic_probe,
123};
124module_platform_driver(hi6421_pmic_driver);
125
126MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
127MODULE_DESCRIPTION("Hi6421 PMIC driver");
128MODULE_LICENSE("GPL v2");
129