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
22 static const struct mfd_cell hi6421_devs[] = {
23 { .name = "hi6421-regulator", },
24 };
25
26 static const struct mfd_cell hi6421v530_devs[] = {
27 { .name = "hi6421v530-regulator", },
28 };
29
30 static 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
37 static 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 };
48 MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
49
hi6421_pmic_probe(struct platform_device * pdev)50 static 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
117 static 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 };
124 module_platform_driver(hi6421_pmic_driver);
125
126 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
127 MODULE_DESCRIPTION("Hi6421 PMIC driver");
128 MODULE_LICENSE("GPL v2");
129