virtio-mem: don't read big block size in Sub Block Mode
[linux-2.6-microblaze.git] / drivers / regulator / vexpress-regulator.c
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2012 ARM Limited
4
5 #define DRVNAME "vexpress-regulator"
6 #define pr_fmt(fmt) DRVNAME ": " fmt
7
8 #include <linux/device.h>
9 #include <linux/err.h>
10 #include <linux/module.h>
11 #include <linux/of_device.h>
12 #include <linux/regulator/driver.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/regulator/of_regulator.h>
15 #include <linux/vexpress.h>
16
17 static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
18 {
19         unsigned int uV;
20         int err = regmap_read(regdev->regmap, 0, &uV);
21
22         return err ? err : uV;
23 }
24
25 static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
26                 int min_uV, int max_uV, unsigned *selector)
27 {
28         return regmap_write(regdev->regmap, 0, min_uV);
29 }
30
31 static const struct regulator_ops vexpress_regulator_ops_ro = {
32         .get_voltage = vexpress_regulator_get_voltage,
33 };
34
35 static const struct regulator_ops vexpress_regulator_ops = {
36         .get_voltage = vexpress_regulator_get_voltage,
37         .set_voltage = vexpress_regulator_set_voltage,
38 };
39
40 static int vexpress_regulator_probe(struct platform_device *pdev)
41 {
42         struct regulator_desc *desc;
43         struct regulator_init_data *init_data;
44         struct regulator_config config = { };
45         struct regulator_dev *rdev;
46         struct regmap *regmap;
47
48         desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
49         if (!desc)
50                 return -ENOMEM;
51
52         regmap = devm_regmap_init_vexpress_config(&pdev->dev);
53         if (IS_ERR(regmap))
54                 return PTR_ERR(regmap);
55
56         desc->name = dev_name(&pdev->dev);
57         desc->type = REGULATOR_VOLTAGE;
58         desc->owner = THIS_MODULE;
59         desc->continuous_voltage_range = true;
60
61         init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
62                                                desc);
63         if (!init_data)
64                 return -EINVAL;
65
66         init_data->constraints.apply_uV = 0;
67         if (init_data->constraints.min_uV && init_data->constraints.max_uV)
68                 desc->ops = &vexpress_regulator_ops;
69         else
70                 desc->ops = &vexpress_regulator_ops_ro;
71
72         config.regmap = regmap;
73         config.dev = &pdev->dev;
74         config.init_data = init_data;
75         config.of_node = pdev->dev.of_node;
76
77         rdev = devm_regulator_register(&pdev->dev, desc, &config);
78         return PTR_ERR_OR_ZERO(rdev);
79 }
80
81 static const struct of_device_id vexpress_regulator_of_match[] = {
82         { .compatible = "arm,vexpress-volt", },
83         { }
84 };
85 MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
86
87 static struct platform_driver vexpress_regulator_driver = {
88         .probe = vexpress_regulator_probe,
89         .driver = {
90                 .name = DRVNAME,
91                 .of_match_table = vexpress_regulator_of_match,
92         },
93 };
94
95 module_platform_driver(vexpress_regulator_driver);
96
97 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
98 MODULE_DESCRIPTION("Versatile Express regulator");
99 MODULE_LICENSE("GPL");
100 MODULE_ALIAS("platform:vexpress-regulator");