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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/mod_devicetable.h>
12#include <linux/platform_device.h>
13#include <linux/regulator/driver.h>
14#include <linux/regulator/machine.h>
15#include <linux/regulator/of_regulator.h>
16#include <linux/vexpress.h>
17
18static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
19{
20 unsigned int uV;
21 int err = regmap_read(regdev->regmap, 0, &uV);
22
23 return err ? err : uV;
24}
25
26static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
27 int min_uV, int max_uV, unsigned *selector)
28{
29 return regmap_write(regdev->regmap, 0, min_uV);
30}
31
32static const struct regulator_ops vexpress_regulator_ops_ro = {
33 .get_voltage = vexpress_regulator_get_voltage,
34};
35
36static const struct regulator_ops vexpress_regulator_ops = {
37 .get_voltage = vexpress_regulator_get_voltage,
38 .set_voltage = vexpress_regulator_set_voltage,
39};
40
41static int vexpress_regulator_probe(struct platform_device *pdev)
42{
43 struct regulator_desc *desc;
44 struct regulator_init_data *init_data;
45 struct regulator_config config = { };
46 struct regulator_dev *rdev;
47 struct regmap *regmap;
48
49 desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL);
50 if (!desc)
51 return -ENOMEM;
52
53 regmap = devm_regmap_init_vexpress_config(&pdev->dev);
54 if (IS_ERR(regmap))
55 return PTR_ERR(regmap);
56
57 desc->name = dev_name(&pdev->dev);
58 desc->type = REGULATOR_VOLTAGE;
59 desc->owner = THIS_MODULE;
60 desc->continuous_voltage_range = true;
61
62 init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
63 desc);
64 if (!init_data)
65 return -EINVAL;
66
67 init_data->constraints.apply_uV = 0;
68 if (init_data->constraints.min_uV && init_data->constraints.max_uV)
69 desc->ops = &vexpress_regulator_ops;
70 else
71 desc->ops = &vexpress_regulator_ops_ro;
72
73 config.regmap = regmap;
74 config.dev = &pdev->dev;
75 config.init_data = init_data;
76 config.of_node = pdev->dev.of_node;
77
78 rdev = devm_regulator_register(&pdev->dev, desc, &config);
79 return PTR_ERR_OR_ZERO(rdev);
80}
81
82static const struct of_device_id vexpress_regulator_of_match[] = {
83 { .compatible = "arm,vexpress-volt", },
84 { }
85};
86MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
87
88static struct platform_driver vexpress_regulator_driver = {
89 .probe = vexpress_regulator_probe,
90 .driver = {
91 .name = DRVNAME,
92 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
93 .of_match_table = vexpress_regulator_of_match,
94 },
95};
96
97module_platform_driver(vexpress_regulator_driver);
98
99MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
100MODULE_DESCRIPTION("Versatile Express regulator");
101MODULE_LICENSE("GPL");
102MODULE_ALIAS("platform:vexpress-regulator");
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
17static 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
25static 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
31static const struct regulator_ops vexpress_regulator_ops_ro = {
32 .get_voltage = vexpress_regulator_get_voltage,
33};
34
35static const struct regulator_ops vexpress_regulator_ops = {
36 .get_voltage = vexpress_regulator_get_voltage,
37 .set_voltage = vexpress_regulator_set_voltage,
38};
39
40static 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 if (IS_ERR(rdev))
79 return PTR_ERR(rdev);
80
81 return 0;
82}
83
84static const struct of_device_id vexpress_regulator_of_match[] = {
85 { .compatible = "arm,vexpress-volt", },
86 { }
87};
88MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match);
89
90static struct platform_driver vexpress_regulator_driver = {
91 .probe = vexpress_regulator_probe,
92 .driver = {
93 .name = DRVNAME,
94 .of_match_table = vexpress_regulator_of_match,
95 },
96};
97
98module_platform_driver(vexpress_regulator_driver);
99
100MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
101MODULE_DESCRIPTION("Versatile Express regulator");
102MODULE_LICENSE("GPL");
103MODULE_ALIAS("platform:vexpress-regulator");