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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
3 | // Copyright (C) 2012 ARM Limited | |
31e54086 PM |
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 | ||
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17 | static int vexpress_regulator_get_voltage(struct regulator_dev *regdev) |
18 | { | |
eeb1b235 AL |
19 | unsigned int uV; |
20 | int err = regmap_read(regdev->regmap, 0, &uV); | |
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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 | { | |
eeb1b235 | 28 | return regmap_write(regdev->regmap, 0, min_uV); |
31e54086 PM |
29 | } |
30 | ||
ab54a4d7 | 31 | static const struct regulator_ops vexpress_regulator_ops_ro = { |
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32 | .get_voltage = vexpress_regulator_get_voltage, |
33 | }; | |
34 | ||
ab54a4d7 | 35 | static const struct regulator_ops vexpress_regulator_ops = { |
31e54086 PM |
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 | { | |
eeb1b235 | 42 | struct regulator_desc *desc; |
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43 | struct regulator_init_data *init_data; |
44 | struct regulator_config config = { }; | |
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45 | struct regulator_dev *rdev; |
46 | struct regmap *regmap; | |
31e54086 | 47 | |
eeb1b235 AL |
48 | desc = devm_kzalloc(&pdev->dev, sizeof(*desc), GFP_KERNEL); |
49 | if (!desc) | |
3b9334ac | 50 | return -ENOMEM; |
31e54086 | 51 | |
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52 | regmap = devm_regmap_init_vexpress_config(&pdev->dev); |
53 | if (IS_ERR(regmap)) | |
54 | return PTR_ERR(regmap); | |
31e54086 | 55 | |
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56 | desc->name = dev_name(&pdev->dev); |
57 | desc->type = REGULATOR_VOLTAGE; | |
58 | desc->owner = THIS_MODULE; | |
59 | desc->continuous_voltage_range = true; | |
31e54086 | 60 | |
072e78b1 | 61 | init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node, |
eeb1b235 | 62 | desc); |
3b9334ac PM |
63 | if (!init_data) |
64 | return -EINVAL; | |
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65 | |
66 | init_data->constraints.apply_uV = 0; | |
67 | if (init_data->constraints.min_uV && init_data->constraints.max_uV) | |
eeb1b235 | 68 | desc->ops = &vexpress_regulator_ops; |
31e54086 | 69 | else |
eeb1b235 | 70 | desc->ops = &vexpress_regulator_ops_ro; |
31e54086 | 71 | |
eeb1b235 | 72 | config.regmap = regmap; |
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73 | config.dev = &pdev->dev; |
74 | config.init_data = init_data; | |
31e54086 PM |
75 | config.of_node = pdev->dev.of_node; |
76 | ||
eeb1b235 | 77 | rdev = devm_regulator_register(&pdev->dev, desc, &config); |
1d7c4c11 | 78 | return PTR_ERR_OR_ZERO(rdev); |
31e54086 PM |
79 | } |
80 | ||
1439afd8 | 81 | static const struct of_device_id vexpress_regulator_of_match[] = { |
31e54086 | 82 | { .compatible = "arm,vexpress-volt", }, |
9f4e45f7 | 83 | { } |
31e54086 | 84 | }; |
7209fee8 | 85 | MODULE_DEVICE_TABLE(of, vexpress_regulator_of_match); |
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86 | |
87 | static struct platform_driver vexpress_regulator_driver = { | |
88 | .probe = vexpress_regulator_probe, | |
31e54086 PM |
89 | .driver = { |
90 | .name = DRVNAME, | |
31e54086 PM |
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"); |