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Guodong Xu8bdf87b2014-09-01 16:28:34 +08001/*
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
34static const struct mfd_cell hi6421_devs[] = {
35 { .name = "hi6421-regulator", },
36};
37
Krzysztof Kozlowski7f9e3fe2015-01-05 10:01:21 +010038static const struct regmap_config hi6421_regmap_config = {
Guodong Xu8bdf87b2014-09-01 16:28:34 +080039 .reg_bits = 32,
40 .reg_stride = 4,
41 .val_bits = 8,
42 .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
43};
44
45static 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
89static int hi6421_pmic_remove(struct platform_device *pdev)
90{
91 mfd_remove_devices(&pdev->dev);
92
93 return 0;
94}
95
Fabian Frederick908725d2015-03-16 20:21:36 +010096static const struct of_device_id of_hi6421_pmic_match_tbl[] = {
Guodong Xu8bdf87b2014-09-01 16:28:34 +080097 { .compatible = "hisilicon,hi6421-pmic", },
98 { },
99};
Luis de Bethencourt54450732015-09-17 20:16:10 +0200100MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match_tbl);
Guodong Xu8bdf87b2014-09-01 16:28:34 +0800101
102static 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};
110module_platform_driver(hi6421_pmic_driver);
111
112MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
113MODULE_DESCRIPTION("Hi6421 PMIC driver");
114MODULE_LICENSE("GPL v2");