xref: /linux/drivers/mfd/hi6421-pmic-core.c (revision 0ea5c948cb64bab5bc7a5516774eb8536f05aa0d)
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