1/*
2 * Device driver for Hi6421 PMIC
3 *
4 * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
5 * http://www.hisilicon.com
6 * Copyright (c) <2013-2017> Linaro Ltd.
7 * http://www.linaro.org
8 *
9 * Author: Guodong Xu <guodong.xu@linaro.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16#include <linux/device.h>
17#include <linux/err.h>
18#include <linux/mfd/core.h>
19#include <linux/mfd/hi6421-pmic.h>
20#include <linux/module.h>
21#include <linux/of_device.h>
22#include <linux/platform_device.h>
23#include <linux/regmap.h>
24
25static const struct mfd_cell hi6421_devs[] = {
26 { .name = "hi6421-regulator", },
27};
28
29static const struct mfd_cell hi6421v530_devs[] = {
30 { .name = "hi6421v530-regulator", },
31};
32
33static const struct regmap_config hi6421_regmap_config = {
34 .reg_bits = 32,
35 .reg_stride = 4,
36 .val_bits = 8,
37 .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
38};
39
40static const struct of_device_id of_hi6421_pmic_match[] = {
41 {
42 .compatible = "hisilicon,hi6421-pmic",
43 .data = (void *)HI6421
44 },
45 {
46 .compatible = "hisilicon,hi6421v530-pmic",
47 .data = (void *)HI6421_V530
48 },
49 { },
50};
51MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
52
53static int hi6421_pmic_probe(struct platform_device *pdev)
54{
55 struct hi6421_pmic *pmic;
56 struct resource *res;
57 const struct of_device_id *id;
58 const struct mfd_cell *subdevs;
59 enum hi6421_type type;
60 void __iomem *base;
61 int n_subdevs, ret;
62
63 id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
64 if (!id)
65 return -EINVAL;
66 type = (enum hi6421_type)id->data;
67
68 pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
69 if (!pmic)
70 return -ENOMEM;
71
72 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
73 base = devm_ioremap_resource(&pdev->dev, res);
74 if (IS_ERR(base))
75 return PTR_ERR(base);
76
77 pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
78 &hi6421_regmap_config);
79 if (IS_ERR(pmic->regmap)) {
80 dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
81 PTR_ERR(pmic->regmap));
82 return PTR_ERR(pmic->regmap);
83 }
84
85 platform_set_drvdata(pdev, pmic);
86
87 switch (type) {
88 case HI6421:
89 /* set over-current protection debounce 8ms */
90 regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
91 (HI6421_OCP_DEB_SEL_MASK
92 | HI6421_OCP_EN_DEBOUNCE_MASK
93 | HI6421_OCP_AUTO_STOP_MASK),
94 (HI6421_OCP_DEB_SEL_8MS
95 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
96
97 subdevs = hi6421_devs;
98 n_subdevs = ARRAY_SIZE(hi6421_devs);
99 break;
100 case HI6421_V530:
101 subdevs = hi6421v530_devs;
102 n_subdevs = ARRAY_SIZE(hi6421v530_devs);
103 break;
104 default:
105 dev_err(&pdev->dev, "Unknown device type %d\n",
106 (unsigned int)type);
107 return -EINVAL;
108 }
109
110 ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
111 subdevs, n_subdevs, NULL, 0, NULL);
112 if (ret) {
113 dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
114 return ret;
115 }
116
117 return 0;
118}
119
120static struct platform_driver hi6421_pmic_driver = {
121 .driver = {
122 .name = "hi6421_pmic",
123 .of_match_table = of_hi6421_pmic_match,
124 },
125 .probe = hi6421_pmic_probe,
126};
127module_platform_driver(hi6421_pmic_driver);
128
129MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
130MODULE_DESCRIPTION("Hi6421 PMIC driver");
131MODULE_LICENSE("GPL v2");
132