1 /*
2 * OF helpers for regulator framework
3 *
4 * Copyright (C) 2011 Texas Instruments, Inc.
5 * Rajendra Nayak <rnayak@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/of.h>
16 #include <linux/regulator/machine.h>
17
of_get_regulation_constraints(struct device_node * np,struct regulator_init_data ** init_data)18 static void of_get_regulation_constraints(struct device_node *np,
19 struct regulator_init_data **init_data)
20 {
21 const __be32 *min_uV, *max_uV, *uV_offset;
22 const __be32 *min_uA, *max_uA;
23 struct regulation_constraints *constraints = &(*init_data)->constraints;
24
25 constraints->name = of_get_property(np, "regulator-name", NULL);
26
27 min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
28 if (min_uV)
29 constraints->min_uV = be32_to_cpu(*min_uV);
30 max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
31 if (max_uV)
32 constraints->max_uV = be32_to_cpu(*max_uV);
33
34 /* Voltage change possible? */
35 if (constraints->min_uV != constraints->max_uV)
36 constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
37 /* Only one voltage? Then make sure it's set. */
38 if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
39 constraints->apply_uV = true;
40
41 uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
42 if (uV_offset)
43 constraints->uV_offset = be32_to_cpu(*uV_offset);
44 min_uA = of_get_property(np, "regulator-min-microamp", NULL);
45 if (min_uA)
46 constraints->min_uA = be32_to_cpu(*min_uA);
47 max_uA = of_get_property(np, "regulator-max-microamp", NULL);
48 if (max_uA)
49 constraints->max_uA = be32_to_cpu(*max_uA);
50
51 /* Current change possible? */
52 if (constraints->min_uA != constraints->max_uA)
53 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
54
55 if (of_find_property(np, "regulator-boot-on", NULL))
56 constraints->boot_on = true;
57
58 if (of_find_property(np, "regulator-always-on", NULL))
59 constraints->always_on = true;
60 else /* status change should be possible if not always on. */
61 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
62 }
63
64 /**
65 * of_get_regulator_init_data - extract regulator_init_data structure info
66 * @dev: device requesting for regulator_init_data
67 *
68 * Populates regulator_init_data structure by extracting data from device
69 * tree node, returns a pointer to the populated struture or NULL if memory
70 * alloc fails.
71 */
of_get_regulator_init_data(struct device * dev,struct device_node * node)72 struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
73 struct device_node *node)
74 {
75 struct regulator_init_data *init_data;
76
77 if (!node)
78 return NULL;
79
80 init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
81 if (!init_data)
82 return NULL; /* Out of memory? */
83
84 of_get_regulation_constraints(node, &init_data);
85 return init_data;
86 }
87 EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
88