xref: /kernel/linux/linux-5.10/drivers/mfd/tps68470.c (revision 8c2ecf20) 
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * TPS68470 chip Parent driver
4 *
5 * Copyright (C) 2017 Intel Corporation
6 *
7 * Authors:
8 *	Rajmohan Mani <rajmohan.mani@intel.com>
9 *	Tianshu Qiu <tian.shu.qiu@intel.com>
10 *	Jian Xu Zheng <jian.xu.zheng@intel.com>
11 *	Yuning Pu <yuning.pu@intel.com>
12 */
13
14#include <linux/acpi.h>
15#include <linux/delay.h>
16#include <linux/i2c.h>
17#include <linux/init.h>
18#include <linux/mfd/core.h>
19#include <linux/mfd/tps68470.h>
20#include <linux/regmap.h>
21
22static const struct mfd_cell tps68470s[] = {
23	{ .name = "tps68470-gpio" },
24	{ .name = "tps68470_pmic_opregion" },
25};
26
27static const struct regmap_config tps68470_regmap_config = {
28	.reg_bits = 8,
29	.val_bits = 8,
30	.max_register = TPS68470_REG_MAX,
31};
32
33static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
34{
35	unsigned int version;
36	int ret;
37
38	/* Force software reset */
39	ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK);
40	if (ret)
41		return ret;
42
43	ret = regmap_read(regmap, TPS68470_REG_REVID, &version);
44	if (ret) {
45		dev_err(dev, "Failed to read revision register: %d\n", ret);
46		return ret;
47	}
48
49	dev_info(dev, "TPS68470 REVID: 0x%x\n", version);
50
51	return 0;
52}
53
54static int tps68470_probe(struct i2c_client *client)
55{
56	struct device *dev = &client->dev;
57	struct regmap *regmap;
58	int ret;
59
60	regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config);
61	if (IS_ERR(regmap)) {
62		dev_err(dev, "devm_regmap_init_i2c Error %ld\n",
63			PTR_ERR(regmap));
64		return PTR_ERR(regmap);
65	}
66
67	i2c_set_clientdata(client, regmap);
68
69	ret = tps68470_chip_init(dev, regmap);
70	if (ret < 0) {
71		dev_err(dev, "TPS68470 Init Error %d\n", ret);
72		return ret;
73	}
74
75	ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s,
76			      ARRAY_SIZE(tps68470s), NULL, 0, NULL);
77	if (ret < 0) {
78		dev_err(dev, "devm_mfd_add_devices failed: %d\n", ret);
79		return ret;
80	}
81
82	return 0;
83}
84
85static const struct acpi_device_id tps68470_acpi_ids[] = {
86	{"INT3472"},
87	{},
88};
89
90static struct i2c_driver tps68470_driver = {
91	.driver = {
92		   .name = "tps68470",
93		   .acpi_match_table = tps68470_acpi_ids,
94	},
95	.probe_new = tps68470_probe,
96};
97builtin_i2c_driver(tps68470_driver);
98