xref: /kernel/linux/linux-5.10/drivers/mfd/bcm590xx.c (revision 8c2ecf20) 
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Broadcom BCM590xx PMU
4 *
5 * Copyright 2014 Linaro Limited
6 * Author: Matt Porter <mporter@linaro.org>
7 */
8
9#include <linux/err.h>
10#include <linux/i2c.h>
11#include <linux/init.h>
12#include <linux/mfd/bcm590xx.h>
13#include <linux/mfd/core.h>
14#include <linux/module.h>
15#include <linux/moduleparam.h>
16#include <linux/of.h>
17#include <linux/of_device.h>
18#include <linux/regmap.h>
19#include <linux/slab.h>
20
21static const struct mfd_cell bcm590xx_devs[] = {
22	{
23		.name = "bcm590xx-vregs",
24	},
25};
26
27static const struct regmap_config bcm590xx_regmap_config_pri = {
28	.reg_bits	= 8,
29	.val_bits	= 8,
30	.max_register	= BCM590XX_MAX_REGISTER_PRI,
31	.cache_type	= REGCACHE_RBTREE,
32};
33
34static const struct regmap_config bcm590xx_regmap_config_sec = {
35	.reg_bits	= 8,
36	.val_bits	= 8,
37	.max_register	= BCM590XX_MAX_REGISTER_SEC,
38	.cache_type	= REGCACHE_RBTREE,
39};
40
41static int bcm590xx_i2c_probe(struct i2c_client *i2c_pri,
42			      const struct i2c_device_id *id)
43{
44	struct bcm590xx *bcm590xx;
45	int ret;
46
47	bcm590xx = devm_kzalloc(&i2c_pri->dev, sizeof(*bcm590xx), GFP_KERNEL);
48	if (!bcm590xx)
49		return -ENOMEM;
50
51	i2c_set_clientdata(i2c_pri, bcm590xx);
52	bcm590xx->dev = &i2c_pri->dev;
53	bcm590xx->i2c_pri = i2c_pri;
54
55	bcm590xx->regmap_pri = devm_regmap_init_i2c(i2c_pri,
56						 &bcm590xx_regmap_config_pri);
57	if (IS_ERR(bcm590xx->regmap_pri)) {
58		ret = PTR_ERR(bcm590xx->regmap_pri);
59		dev_err(&i2c_pri->dev, "primary regmap init failed: %d\n", ret);
60		return ret;
61	}
62
63	/* Secondary I2C slave address is the base address with A(2) asserted */
64	bcm590xx->i2c_sec = i2c_new_dummy_device(i2c_pri->adapter,
65					  i2c_pri->addr | BIT(2));
66	if (IS_ERR(bcm590xx->i2c_sec)) {
67		dev_err(&i2c_pri->dev, "failed to add secondary I2C device\n");
68		return PTR_ERR(bcm590xx->i2c_sec);
69	}
70	i2c_set_clientdata(bcm590xx->i2c_sec, bcm590xx);
71
72	bcm590xx->regmap_sec = devm_regmap_init_i2c(bcm590xx->i2c_sec,
73						&bcm590xx_regmap_config_sec);
74	if (IS_ERR(bcm590xx->regmap_sec)) {
75		ret = PTR_ERR(bcm590xx->regmap_sec);
76		dev_err(&bcm590xx->i2c_sec->dev,
77			"secondary regmap init failed: %d\n", ret);
78		goto err;
79	}
80
81	ret = devm_mfd_add_devices(&i2c_pri->dev, -1, bcm590xx_devs,
82				   ARRAY_SIZE(bcm590xx_devs), NULL, 0, NULL);
83	if (ret < 0) {
84		dev_err(&i2c_pri->dev, "failed to add sub-devices: %d\n", ret);
85		goto err;
86	}
87
88	return 0;
89
90err:
91	i2c_unregister_device(bcm590xx->i2c_sec);
92	return ret;
93}
94
95static const struct of_device_id bcm590xx_of_match[] = {
96	{ .compatible = "brcm,bcm59056" },
97	{ }
98};
99MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
100
101static const struct i2c_device_id bcm590xx_i2c_id[] = {
102	{ "bcm59056" },
103	{ }
104};
105MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
106
107static struct i2c_driver bcm590xx_i2c_driver = {
108	.driver = {
109		   .name = "bcm590xx",
110		   .of_match_table = of_match_ptr(bcm590xx_of_match),
111	},
112	.probe = bcm590xx_i2c_probe,
113	.id_table = bcm590xx_i2c_id,
114};
115module_i2c_driver(bcm590xx_i2c_driver);
116
117MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
118MODULE_DESCRIPTION("BCM590xx multi-function driver");
119MODULE_LICENSE("GPL v2");
120