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 
21 static const struct mfd_cell bcm590xx_devs[] = {
22 	{
23 		.name = "bcm590xx-vregs",
24 	},
25 };
26 
27 static 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 
34 static 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 
bcm590xx_i2c_probe(struct i2c_client * i2c_pri,const struct i2c_device_id * id)41 static 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 
90 err:
91 	i2c_unregister_device(bcm590xx->i2c_sec);
92 	return ret;
93 }
94 
95 static const struct of_device_id bcm590xx_of_match[] = {
96 	{ .compatible = "brcm,bcm59056" },
97 	{ }
98 };
99 MODULE_DEVICE_TABLE(of, bcm590xx_of_match);
100 
101 static const struct i2c_device_id bcm590xx_i2c_id[] = {
102 	{ "bcm59056" },
103 	{ }
104 };
105 MODULE_DEVICE_TABLE(i2c, bcm590xx_i2c_id);
106 
107 static struct i2c_driver bcm590xx_i2c_driver = {
108 	.driver = {
109 		   .name = "bcm590xx",
110 		   .of_match_table = bcm590xx_of_match,
111 	},
112 	.probe = bcm590xx_i2c_probe,
113 	.id_table = bcm590xx_i2c_id,
114 };
115 module_i2c_driver(bcm590xx_i2c_driver);
116 
117 MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
118 MODULE_DESCRIPTION("BCM590xx multi-function driver");
119 MODULE_LICENSE("GPL v2");
120