1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Device driver for Hi6421 PMIC
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
6*4882a593Smuzhiyun * http://www.hisilicon.com
7*4882a593Smuzhiyun * Copyright (c) <2013-2017> Linaro Ltd.
8*4882a593Smuzhiyun * https://www.linaro.org
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * Author: Guodong Xu <guodong.xu@linaro.org>
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/device.h>
14*4882a593Smuzhiyun #include <linux/err.h>
15*4882a593Smuzhiyun #include <linux/mfd/core.h>
16*4882a593Smuzhiyun #include <linux/mfd/hi6421-pmic.h>
17*4882a593Smuzhiyun #include <linux/module.h>
18*4882a593Smuzhiyun #include <linux/of_device.h>
19*4882a593Smuzhiyun #include <linux/platform_device.h>
20*4882a593Smuzhiyun #include <linux/regmap.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun static const struct mfd_cell hi6421_devs[] = {
23*4882a593Smuzhiyun { .name = "hi6421-regulator", },
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static const struct mfd_cell hi6421v530_devs[] = {
27*4882a593Smuzhiyun { .name = "hi6421v530-regulator", },
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static const struct regmap_config hi6421_regmap_config = {
31*4882a593Smuzhiyun .reg_bits = 32,
32*4882a593Smuzhiyun .reg_stride = 4,
33*4882a593Smuzhiyun .val_bits = 8,
34*4882a593Smuzhiyun .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
35*4882a593Smuzhiyun };
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun static const struct of_device_id of_hi6421_pmic_match[] = {
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun .compatible = "hisilicon,hi6421-pmic",
40*4882a593Smuzhiyun .data = (void *)HI6421
41*4882a593Smuzhiyun },
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun .compatible = "hisilicon,hi6421v530-pmic",
44*4882a593Smuzhiyun .data = (void *)HI6421_V530
45*4882a593Smuzhiyun },
46*4882a593Smuzhiyun { },
47*4882a593Smuzhiyun };
48*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
49*4882a593Smuzhiyun
hi6421_pmic_probe(struct platform_device * pdev)50*4882a593Smuzhiyun static int hi6421_pmic_probe(struct platform_device *pdev)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun struct hi6421_pmic *pmic;
53*4882a593Smuzhiyun struct resource *res;
54*4882a593Smuzhiyun const struct of_device_id *id;
55*4882a593Smuzhiyun const struct mfd_cell *subdevs;
56*4882a593Smuzhiyun enum hi6421_type type;
57*4882a593Smuzhiyun void __iomem *base;
58*4882a593Smuzhiyun int n_subdevs, ret;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
61*4882a593Smuzhiyun if (!id)
62*4882a593Smuzhiyun return -EINVAL;
63*4882a593Smuzhiyun type = (enum hi6421_type)id->data;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
66*4882a593Smuzhiyun if (!pmic)
67*4882a593Smuzhiyun return -ENOMEM;
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
70*4882a593Smuzhiyun base = devm_ioremap_resource(&pdev->dev, res);
71*4882a593Smuzhiyun if (IS_ERR(base))
72*4882a593Smuzhiyun return PTR_ERR(base);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
75*4882a593Smuzhiyun &hi6421_regmap_config);
76*4882a593Smuzhiyun if (IS_ERR(pmic->regmap)) {
77*4882a593Smuzhiyun dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
78*4882a593Smuzhiyun PTR_ERR(pmic->regmap));
79*4882a593Smuzhiyun return PTR_ERR(pmic->regmap);
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun platform_set_drvdata(pdev, pmic);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun switch (type) {
85*4882a593Smuzhiyun case HI6421:
86*4882a593Smuzhiyun /* set over-current protection debounce 8ms */
87*4882a593Smuzhiyun regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
88*4882a593Smuzhiyun (HI6421_OCP_DEB_SEL_MASK
89*4882a593Smuzhiyun | HI6421_OCP_EN_DEBOUNCE_MASK
90*4882a593Smuzhiyun | HI6421_OCP_AUTO_STOP_MASK),
91*4882a593Smuzhiyun (HI6421_OCP_DEB_SEL_8MS
92*4882a593Smuzhiyun | HI6421_OCP_EN_DEBOUNCE_ENABLE));
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun subdevs = hi6421_devs;
95*4882a593Smuzhiyun n_subdevs = ARRAY_SIZE(hi6421_devs);
96*4882a593Smuzhiyun break;
97*4882a593Smuzhiyun case HI6421_V530:
98*4882a593Smuzhiyun subdevs = hi6421v530_devs;
99*4882a593Smuzhiyun n_subdevs = ARRAY_SIZE(hi6421v530_devs);
100*4882a593Smuzhiyun break;
101*4882a593Smuzhiyun default:
102*4882a593Smuzhiyun dev_err(&pdev->dev, "Unknown device type %d\n",
103*4882a593Smuzhiyun (unsigned int)type);
104*4882a593Smuzhiyun return -EINVAL;
105*4882a593Smuzhiyun }
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
108*4882a593Smuzhiyun subdevs, n_subdevs, NULL, 0, NULL);
109*4882a593Smuzhiyun if (ret) {
110*4882a593Smuzhiyun dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
111*4882a593Smuzhiyun return ret;
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun
114*4882a593Smuzhiyun return 0;
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun static struct platform_driver hi6421_pmic_driver = {
118*4882a593Smuzhiyun .driver = {
119*4882a593Smuzhiyun .name = "hi6421_pmic",
120*4882a593Smuzhiyun .of_match_table = of_hi6421_pmic_match,
121*4882a593Smuzhiyun },
122*4882a593Smuzhiyun .probe = hi6421_pmic_probe,
123*4882a593Smuzhiyun };
124*4882a593Smuzhiyun module_platform_driver(hi6421_pmic_driver);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
127*4882a593Smuzhiyun MODULE_DESCRIPTION("Hi6421 PMIC driver");
128*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
129