media: v4l2_driver: Supplement the missing runtime pm get ops on more than once strea...
[platform/kernel/linux-starfive.git] / drivers / mfd / lp87565.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
4  *
5  * Author: Keerthy <j-keerthy@ti.com>
6  */
7
8 #include <linux/gpio/consumer.h>
9 #include <linux/interrupt.h>
10 #include <linux/mfd/core.h>
11 #include <linux/module.h>
12 #include <linux/of_device.h>
13 #include <linux/regmap.h>
14
15 #include <linux/mfd/lp87565.h>
16
17 static const struct regmap_config lp87565_regmap_config = {
18         .reg_bits = 8,
19         .val_bits = 8,
20         .max_register = LP87565_REG_MAX,
21 };
22
23 static const struct mfd_cell lp87565_cells[] = {
24         { .name = "lp87565-q1-regulator", },
25         { .name = "lp87565-q1-gpio", },
26 };
27
28 static const struct of_device_id of_lp87565_match_table[] = {
29         { .compatible = "ti,lp87565", },
30         {
31                 .compatible = "ti,lp87524-q1",
32                 .data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
33         },
34         {
35                 .compatible = "ti,lp87565-q1",
36                 .data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
37         },
38         {
39                 .compatible = "ti,lp87561-q1",
40                 .data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
41         },
42         {}
43 };
44 MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
45
46 static int lp87565_probe(struct i2c_client *client,
47                          const struct i2c_device_id *ids)
48 {
49         struct lp87565 *lp87565;
50         const struct of_device_id *of_id;
51         int ret;
52         unsigned int otpid;
53
54         lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
55         if (!lp87565)
56                 return -ENOMEM;
57
58         lp87565->dev = &client->dev;
59
60         lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
61         if (IS_ERR(lp87565->regmap)) {
62                 ret = PTR_ERR(lp87565->regmap);
63                 dev_err(lp87565->dev,
64                         "Failed to initialize register map: %d\n", ret);
65                 return ret;
66         }
67
68         lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
69                                                       GPIOD_OUT_LOW);
70         if (IS_ERR(lp87565->reset_gpio)) {
71                 ret = PTR_ERR(lp87565->reset_gpio);
72                 if (ret == -EPROBE_DEFER)
73                         return ret;
74         }
75
76         if (lp87565->reset_gpio) {
77                 gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
78                 /* The minimum assertion time is undocumented, just guess */
79                 usleep_range(2000, 4000);
80
81                 gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
82                 /* Min 1.2 ms before first I2C transaction */
83                 usleep_range(1500, 3000);
84         }
85
86         ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
87         if (ret) {
88                 dev_err(lp87565->dev, "Failed to read OTP ID\n");
89                 return ret;
90         }
91
92         lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
93
94         of_id = of_match_device(of_lp87565_match_table, &client->dev);
95         if (of_id)
96                 lp87565->dev_type = (enum lp87565_device_type)of_id->data;
97
98         i2c_set_clientdata(client, lp87565);
99
100         return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
101                                     lp87565_cells, ARRAY_SIZE(lp87565_cells),
102                                     NULL, 0, NULL);
103 }
104
105 static void lp87565_shutdown(struct i2c_client *client)
106 {
107         struct lp87565 *lp87565 = i2c_get_clientdata(client);
108
109         gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
110 }
111
112 static const struct i2c_device_id lp87565_id_table[] = {
113         { "lp87565-q1", 0 },
114         { },
115 };
116 MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
117
118 static struct i2c_driver lp87565_driver = {
119         .driver = {
120                 .name   = "lp87565",
121                 .of_match_table = of_lp87565_match_table,
122         },
123         .probe = lp87565_probe,
124         .shutdown = lp87565_shutdown,
125         .id_table = lp87565_id_table,
126 };
127 module_i2c_driver(lp87565_driver);
128
129 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
130 MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
131 MODULE_LICENSE("GPL v2");