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 
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