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
23 static const struct mfd_cell hi6421_devs[] = {
24 { .name = "hi6421-regulator", },
25 };
26
27 static const struct mfd_cell hi6421v530_devs[] = {
28 { .name = "hi6421v530-regulator", },
29 };
30
31 static 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
38 static 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 };
49 MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
50
hi6421_pmic_probe(struct platform_device * pdev)51 static 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
112 static 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 };
119 module_platform_driver(hi6421_pmic_driver);
120
121 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
122 MODULE_DESCRIPTION("Hi6421 PMIC driver");
123 MODULE_LICENSE("GPL v2");
124