Branch data Line data Source code
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 : : #include <linux/regulator/of_regulator.h>
18 : :
19 : 0 : static void of_get_regulation_constraints(struct device_node *np,
20 : : struct regulator_init_data **init_data)
21 : : {
22 : : const __be32 *min_uV, *max_uV, *uV_offset;
23 : : const __be32 *min_uA, *max_uA, *ramp_delay;
24 : : struct property *prop;
25 : 0 : struct regulation_constraints *constraints = &(*init_data)->constraints;
26 : : int ret;
27 : : u32 pval;
28 : :
29 : 0 : constraints->name = of_get_property(np, "regulator-name", NULL);
30 : :
31 : 0 : min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
32 [ # # ]: 0 : if (min_uV)
33 [ # # ]: 0 : constraints->min_uV = be32_to_cpu(*min_uV);
34 : 0 : max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
35 [ # # ]: 0 : if (max_uV)
36 [ # # ]: 0 : constraints->max_uV = be32_to_cpu(*max_uV);
37 : :
38 : : /* Voltage change possible? */
39 [ # # ]: 0 : if (constraints->min_uV != constraints->max_uV)
40 : 0 : constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
41 : : /* Only one voltage? Then make sure it's set. */
42 [ # # ][ # # ]: 0 : if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
43 : 0 : constraints->apply_uV = true;
44 : :
45 : 0 : uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
46 [ # # ]: 0 : if (uV_offset)
47 [ # # ]: 0 : constraints->uV_offset = be32_to_cpu(*uV_offset);
48 : 0 : min_uA = of_get_property(np, "regulator-min-microamp", NULL);
49 [ # # ]: 0 : if (min_uA)
50 [ # # ]: 0 : constraints->min_uA = be32_to_cpu(*min_uA);
51 : 0 : max_uA = of_get_property(np, "regulator-max-microamp", NULL);
52 [ # # ]: 0 : if (max_uA)
53 [ # # ]: 0 : constraints->max_uA = be32_to_cpu(*max_uA);
54 : :
55 : : /* Current change possible? */
56 [ # # ]: 0 : if (constraints->min_uA != constraints->max_uA)
57 : 0 : constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
58 : :
59 [ # # ]: 0 : if (of_find_property(np, "regulator-boot-on", NULL))
60 : 0 : constraints->boot_on = true;
61 : :
62 [ # # ]: 0 : if (of_find_property(np, "regulator-always-on", NULL))
63 : 0 : constraints->always_on = true;
64 : : else /* status change should be possible if not always on. */
65 : 0 : constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
66 : :
67 [ # # ]: 0 : if (of_property_read_bool(np, "regulator-allow-bypass"))
68 : 0 : constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
69 : :
70 : 0 : prop = of_find_property(np, "regulator-ramp-delay", NULL);
71 [ # # ][ # # ]: 0 : if (prop && prop->value) {
72 : : ramp_delay = prop->value;
73 [ # # ]: 0 : if (*ramp_delay)
74 [ # # ]: 0 : constraints->ramp_delay = be32_to_cpu(*ramp_delay);
75 : : else
76 : 0 : constraints->ramp_disable = true;
77 : : }
78 : :
79 : : ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
80 [ # # ]: 0 : if (!ret)
81 : 0 : constraints->enable_time = pval;
82 : 0 : }
83 : :
84 : : /**
85 : : * of_get_regulator_init_data - extract regulator_init_data structure info
86 : : * @dev: device requesting for regulator_init_data
87 : : *
88 : : * Populates regulator_init_data structure by extracting data from device
89 : : * tree node, returns a pointer to the populated struture or NULL if memory
90 : : * alloc fails.
91 : : */
92 : 0 : struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
93 : : struct device_node *node)
94 : : {
95 : : struct regulator_init_data *init_data;
96 : :
97 [ # # ]: 0 : if (!node)
98 : : return NULL;
99 : :
100 : : init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
101 [ # # ]: 0 : if (!init_data)
102 : : return NULL; /* Out of memory? */
103 : :
104 : 0 : of_get_regulation_constraints(node, &init_data);
105 : 0 : return init_data;
106 : : }
107 : : EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
108 : :
109 : : /**
110 : : * of_regulator_match - extract multiple regulator init data from device tree.
111 : : * @dev: device requesting the data
112 : : * @node: parent device node of the regulators
113 : : * @matches: match table for the regulators
114 : : * @num_matches: number of entries in match table
115 : : *
116 : : * This function uses a match table specified by the regulator driver to
117 : : * parse regulator init data from the device tree. @node is expected to
118 : : * contain a set of child nodes, each providing the init data for one
119 : : * regulator. The data parsed from a child node will be matched to a regulator
120 : : * based on either the deprecated property regulator-compatible if present,
121 : : * or otherwise the child node's name. Note that the match table is modified
122 : : * in place.
123 : : *
124 : : * Returns the number of matches found or a negative error code on failure.
125 : : */
126 : 0 : int of_regulator_match(struct device *dev, struct device_node *node,
127 : : struct of_regulator_match *matches,
128 : : unsigned int num_matches)
129 : : {
130 : : unsigned int count = 0;
131 : : unsigned int i;
132 : : const char *name;
133 : : struct device_node *child;
134 : :
135 [ # # ]: 0 : if (!dev || !node)
136 : : return -EINVAL;
137 : :
138 [ # # ]: 0 : for (i = 0; i < num_matches; i++) {
139 : 0 : struct of_regulator_match *match = &matches[i];
140 : 0 : match->init_data = NULL;
141 : 0 : match->of_node = NULL;
142 : : }
143 : :
144 [ # # ]: 0 : for_each_child_of_node(node, child) {
145 : 0 : name = of_get_property(child,
146 : : "regulator-compatible", NULL);
147 [ # # ]: 0 : if (!name)
148 : 0 : name = child->name;
149 [ # # ]: 0 : for (i = 0; i < num_matches; i++) {
150 : 0 : struct of_regulator_match *match = &matches[i];
151 [ # # ]: 0 : if (match->of_node)
152 : 0 : continue;
153 : :
154 [ # # ]: 0 : if (strcmp(match->name, name))
155 : 0 : continue;
156 : :
157 : 0 : match->init_data =
158 : 0 : of_get_regulator_init_data(dev, child);
159 [ # # ]: 0 : if (!match->init_data) {
160 : 0 : dev_err(dev,
161 : : "failed to parse DT for regulator %s\n",
162 : : child->name);
163 : 0 : return -EINVAL;
164 : : }
165 : 0 : match->of_node = child;
166 : 0 : count++;
167 : 0 : break;
168 : : }
169 : : }
170 : :
171 : 0 : return count;
172 : : }
173 : : EXPORT_SYMBOL_GPL(of_regulator_match);
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