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dm: regulator: add fixed voltage regulator driver
[karo-tx-uboot.git] / drivers / power / regulator / fixed.c
1 /*
2  *  Copyright (C) 2015 Samsung Electronics
3  *
4  *  Przemyslaw Marczak <p.marczak@samsung.com>
5  *
6  * SPDX-License-Identifier:     GPL-2.0+
7  */
8
9 #include <common.h>
10 #include <fdtdec.h>
11 #include <errno.h>
12 #include <dm.h>
13 #include <i2c.h>
14 #include <asm/gpio.h>
15 #include <power/pmic.h>
16 #include <power/regulator.h>
17
18 DECLARE_GLOBAL_DATA_PTR;
19
20 struct fixed_regulator_platdata {
21         struct gpio_desc gpio; /* GPIO for regulator enable control */
22 };
23
24 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
25 {
26         struct dm_regulator_uclass_platdata *uc_pdata;
27         struct fixed_regulator_platdata *dev_pdata;
28         struct gpio_desc *gpio;
29         int ret;
30
31         dev_pdata = dev_get_platdata(dev);
32         uc_pdata = dev_get_uclass_platdata(dev);
33         if (!uc_pdata)
34                 return -ENXIO;
35
36         /* Set type to fixed */
37         uc_pdata->type = REGULATOR_TYPE_FIXED;
38
39         /* Get fixed regulator gpio desc */
40         gpio = &dev_pdata->gpio;
41         ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT);
42         if (ret)
43                 debug("Fixed regulator gpio - not found! Error: %d", ret);
44
45         return 0;
46 }
47
48 static int fixed_regulator_get_value(struct udevice *dev)
49 {
50         struct dm_regulator_uclass_platdata *uc_pdata;
51
52         uc_pdata = dev_get_uclass_platdata(dev);
53         if (!uc_pdata)
54                 return -ENXIO;
55
56         if (uc_pdata->min_uV != uc_pdata->max_uV) {
57                 debug("Invalid constraints for: %s\n", uc_pdata->name);
58                 return -EINVAL;
59         }
60
61         return uc_pdata->min_uV;
62 }
63
64 static int fixed_regulator_get_current(struct udevice *dev)
65 {
66         struct dm_regulator_uclass_platdata *uc_pdata;
67
68         uc_pdata = dev_get_uclass_platdata(dev);
69         if (!uc_pdata)
70                 return -ENXIO;
71
72         if (uc_pdata->min_uA != uc_pdata->max_uA) {
73                 debug("Invalid constraints for: %s\n", uc_pdata->name);
74                 return -EINVAL;
75         }
76
77         return uc_pdata->min_uA;
78 }
79
80 static bool fixed_regulator_get_enable(struct udevice *dev)
81 {
82         struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
83
84         if (!dev_pdata->gpio.dev)
85                 return false;
86
87         return dm_gpio_get_value(&dev_pdata->gpio);
88 }
89
90 static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
91 {
92         struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
93         int ret;
94
95         if (!dev_pdata->gpio.dev)
96                 return -ENOSYS;
97
98         ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
99         if (ret) {
100                 error("Can't set regulator : %s gpio to: %d\n", dev->name,
101                       enable);
102                 return ret;
103         }
104         return 0;
105 }
106
107 static const struct dm_regulator_ops fixed_regulator_ops = {
108         .get_value      = fixed_regulator_get_value,
109         .get_current    = fixed_regulator_get_current,
110         .get_enable     = fixed_regulator_get_enable,
111         .set_enable     = fixed_regulator_set_enable,
112 };
113
114 static const struct udevice_id fixed_regulator_ids[] = {
115         { .compatible = "regulator-fixed" },
116         { },
117 };
118
119 U_BOOT_DRIVER(fixed_regulator) = {
120         .name = "fixed regulator",
121         .id = UCLASS_REGULATOR,
122         .ops = &fixed_regulator_ops,
123         .of_match = fixed_regulator_ids,
124         .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
125         .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
126 };