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8bdf87b4 GX |
1 | /* |
2 | * Device driver for Hi6421 IC | |
3 | * | |
4 | * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd. | |
5 | * http://www.hisilicon.com | |
6 | * Copyright (c) <2013-2014> 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 as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope it will be useful, but WITHOUT | |
17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
19 | * more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
23 | */ | |
24 | ||
25 | #include <linux/device.h> | |
26 | #include <linux/err.h> | |
27 | #include <linux/mfd/core.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/of.h> | |
30 | #include <linux/platform_device.h> | |
31 | #include <linux/regmap.h> | |
32 | #include <linux/mfd/hi6421-pmic.h> | |
33 | ||
34 | static const struct mfd_cell hi6421_devs[] = { | |
35 | { .name = "hi6421-regulator", }, | |
36 | }; | |
37 | ||
7f9e3feb | 38 | static const struct regmap_config hi6421_regmap_config = { |
8bdf87b4 GX |
39 | .reg_bits = 32, |
40 | .reg_stride = 4, | |
41 | .val_bits = 8, | |
42 | .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX), | |
43 | }; | |
44 | ||
45 | static int hi6421_pmic_probe(struct platform_device *pdev) | |
46 | { | |
47 | struct hi6421_pmic *pmic; | |
48 | struct resource *res; | |
49 | void __iomem *base; | |
50 | int ret; | |
51 | ||
52 | pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL); | |
53 | if (!pmic) | |
54 | return -ENOMEM; | |
55 | ||
56 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
57 | base = devm_ioremap_resource(&pdev->dev, res); | |
58 | if (IS_ERR(base)) | |
59 | return PTR_ERR(base); | |
60 | ||
61 | pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, | |
62 | &hi6421_regmap_config); | |
63 | if (IS_ERR(pmic->regmap)) { | |
64 | dev_err(&pdev->dev, | |
65 | "regmap init failed: %ld\n", PTR_ERR(pmic->regmap)); | |
66 | return PTR_ERR(pmic->regmap); | |
67 | } | |
68 | ||
69 | /* set over-current protection debounce 8ms */ | |
70 | regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG, | |
71 | (HI6421_OCP_DEB_SEL_MASK | |
72 | | HI6421_OCP_EN_DEBOUNCE_MASK | |
73 | | HI6421_OCP_AUTO_STOP_MASK), | |
74 | (HI6421_OCP_DEB_SEL_8MS | |
75 | | HI6421_OCP_EN_DEBOUNCE_ENABLE)); | |
76 | ||
77 | platform_set_drvdata(pdev, pmic); | |
78 | ||
79 | ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs, | |
80 | ARRAY_SIZE(hi6421_devs), NULL, 0, NULL); | |
81 | if (ret) { | |
82 | dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret); | |
83 | return ret; | |
84 | } | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int hi6421_pmic_remove(struct platform_device *pdev) | |
90 | { | |
91 | mfd_remove_devices(&pdev->dev); | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
908725d5 | 96 | static const struct of_device_id of_hi6421_pmic_match_tbl[] = { |
8bdf87b4 GX |
97 | { .compatible = "hisilicon,hi6421-pmic", }, |
98 | { }, | |
99 | }; | |
54450736 | 100 | MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match_tbl); |
8bdf87b4 GX |
101 | |
102 | static struct platform_driver hi6421_pmic_driver = { | |
103 | .driver = { | |
104 | .name = "hi6421_pmic", | |
105 | .of_match_table = of_hi6421_pmic_match_tbl, | |
106 | }, | |
107 | .probe = hi6421_pmic_probe, | |
108 | .remove = hi6421_pmic_remove, | |
109 | }; | |
110 | module_platform_driver(hi6421_pmic_driver); | |
111 | ||
112 | MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>"); | |
113 | MODULE_DESCRIPTION("Hi6421 PMIC driver"); | |
114 | MODULE_LICENSE("GPL v2"); |