1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * TPS68470 chip Parent driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2017 Intel Corporation
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Authors:
8*4882a593Smuzhiyun * Rajmohan Mani <rajmohan.mani@intel.com>
9*4882a593Smuzhiyun * Tianshu Qiu <tian.shu.qiu@intel.com>
10*4882a593Smuzhiyun * Jian Xu Zheng <jian.xu.zheng@intel.com>
11*4882a593Smuzhiyun * Yuning Pu <yuning.pu@intel.com>
12*4882a593Smuzhiyun */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <linux/acpi.h>
15*4882a593Smuzhiyun #include <linux/delay.h>
16*4882a593Smuzhiyun #include <linux/i2c.h>
17*4882a593Smuzhiyun #include <linux/init.h>
18*4882a593Smuzhiyun #include <linux/mfd/core.h>
19*4882a593Smuzhiyun #include <linux/mfd/tps68470.h>
20*4882a593Smuzhiyun #include <linux/regmap.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun static const struct mfd_cell tps68470s[] = {
23*4882a593Smuzhiyun { .name = "tps68470-gpio" },
24*4882a593Smuzhiyun { .name = "tps68470_pmic_opregion" },
25*4882a593Smuzhiyun };
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun static const struct regmap_config tps68470_regmap_config = {
28*4882a593Smuzhiyun .reg_bits = 8,
29*4882a593Smuzhiyun .val_bits = 8,
30*4882a593Smuzhiyun .max_register = TPS68470_REG_MAX,
31*4882a593Smuzhiyun };
32*4882a593Smuzhiyun
tps68470_chip_init(struct device * dev,struct regmap * regmap)33*4882a593Smuzhiyun static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
34*4882a593Smuzhiyun {
35*4882a593Smuzhiyun unsigned int version;
36*4882a593Smuzhiyun int ret;
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun /* Force software reset */
39*4882a593Smuzhiyun ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK);
40*4882a593Smuzhiyun if (ret)
41*4882a593Smuzhiyun return ret;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun ret = regmap_read(regmap, TPS68470_REG_REVID, &version);
44*4882a593Smuzhiyun if (ret) {
45*4882a593Smuzhiyun dev_err(dev, "Failed to read revision register: %d\n", ret);
46*4882a593Smuzhiyun return ret;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun dev_info(dev, "TPS68470 REVID: 0x%x\n", version);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun return 0;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
tps68470_probe(struct i2c_client * client)54*4882a593Smuzhiyun static int tps68470_probe(struct i2c_client *client)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun struct device *dev = &client->dev;
57*4882a593Smuzhiyun struct regmap *regmap;
58*4882a593Smuzhiyun int ret;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config);
61*4882a593Smuzhiyun if (IS_ERR(regmap)) {
62*4882a593Smuzhiyun dev_err(dev, "devm_regmap_init_i2c Error %ld\n",
63*4882a593Smuzhiyun PTR_ERR(regmap));
64*4882a593Smuzhiyun return PTR_ERR(regmap);
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun i2c_set_clientdata(client, regmap);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun ret = tps68470_chip_init(dev, regmap);
70*4882a593Smuzhiyun if (ret < 0) {
71*4882a593Smuzhiyun dev_err(dev, "TPS68470 Init Error %d\n", ret);
72*4882a593Smuzhiyun return ret;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s,
76*4882a593Smuzhiyun ARRAY_SIZE(tps68470s), NULL, 0, NULL);
77*4882a593Smuzhiyun if (ret < 0) {
78*4882a593Smuzhiyun dev_err(dev, "devm_mfd_add_devices failed: %d\n", ret);
79*4882a593Smuzhiyun return ret;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun return 0;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun static const struct acpi_device_id tps68470_acpi_ids[] = {
86*4882a593Smuzhiyun {"INT3472"},
87*4882a593Smuzhiyun {},
88*4882a593Smuzhiyun };
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun static struct i2c_driver tps68470_driver = {
91*4882a593Smuzhiyun .driver = {
92*4882a593Smuzhiyun .name = "tps68470",
93*4882a593Smuzhiyun .acpi_match_table = tps68470_acpi_ids,
94*4882a593Smuzhiyun },
95*4882a593Smuzhiyun .probe_new = tps68470_probe,
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun builtin_i2c_driver(tps68470_driver);
98