2 * OF helpers for regulator framework
4 * Copyright (C) 2011 Texas Instruments, Inc.
5 * Rajendra Nayak <rnayak@ti.com>
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.
13 #include <linux/module.h>
14 #include <linux/slab.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/regulator/of_regulator.h>
19 static void of_get_regulation_constraints(struct device_node
*np
,
20 struct regulator_init_data
**init_data
)
22 const __be32
*min_uV
, *max_uV
, *uV_offset
;
23 const __be32
*min_uA
, *max_uA
, *ramp_delay
;
24 struct regulation_constraints
*constraints
= &(*init_data
)->constraints
;
26 constraints
->name
= of_get_property(np
, "regulator-name", NULL
);
28 min_uV
= of_get_property(np
, "regulator-min-microvolt", NULL
);
30 constraints
->min_uV
= be32_to_cpu(*min_uV
);
31 max_uV
= of_get_property(np
, "regulator-max-microvolt", NULL
);
33 constraints
->max_uV
= be32_to_cpu(*max_uV
);
35 /* Voltage change possible? */
36 if (constraints
->min_uV
!= constraints
->max_uV
)
37 constraints
->valid_ops_mask
|= REGULATOR_CHANGE_VOLTAGE
;
38 /* Only one voltage? Then make sure it's set. */
39 if (min_uV
&& max_uV
&& constraints
->min_uV
== constraints
->max_uV
)
40 constraints
->apply_uV
= true;
42 uV_offset
= of_get_property(np
, "regulator-microvolt-offset", NULL
);
44 constraints
->uV_offset
= be32_to_cpu(*uV_offset
);
45 min_uA
= of_get_property(np
, "regulator-min-microamp", NULL
);
47 constraints
->min_uA
= be32_to_cpu(*min_uA
);
48 max_uA
= of_get_property(np
, "regulator-max-microamp", NULL
);
50 constraints
->max_uA
= be32_to_cpu(*max_uA
);
52 /* Current change possible? */
53 if (constraints
->min_uA
!= constraints
->max_uA
)
54 constraints
->valid_ops_mask
|= REGULATOR_CHANGE_CURRENT
;
56 if (of_find_property(np
, "regulator-boot-on", NULL
))
57 constraints
->boot_on
= true;
59 if (of_find_property(np
, "regulator-always-on", NULL
))
60 constraints
->always_on
= true;
61 else /* status change should be possible if not always on. */
62 constraints
->valid_ops_mask
|= REGULATOR_CHANGE_STATUS
;
64 if (of_property_read_bool(np
, "regulator-allow-bypass"))
65 constraints
->valid_ops_mask
|= REGULATOR_CHANGE_BYPASS
;
67 ramp_delay
= of_get_property(np
, "regulator-ramp-delay", NULL
);
69 constraints
->ramp_delay
= be32_to_cpu(*ramp_delay
);
73 * of_get_regulator_init_data - extract regulator_init_data structure info
74 * @dev: device requesting for regulator_init_data
76 * Populates regulator_init_data structure by extracting data from device
77 * tree node, returns a pointer to the populated struture or NULL if memory
80 struct regulator_init_data
*of_get_regulator_init_data(struct device
*dev
,
81 struct device_node
*node
)
83 struct regulator_init_data
*init_data
;
88 init_data
= devm_kzalloc(dev
, sizeof(*init_data
), GFP_KERNEL
);
90 return NULL
; /* Out of memory? */
92 of_get_regulation_constraints(node
, &init_data
);
95 EXPORT_SYMBOL_GPL(of_get_regulator_init_data
);
98 * of_regulator_match - extract multiple regulator init data from device tree.
99 * @dev: device requesting the data
100 * @node: parent device node of the regulators
101 * @matches: match table for the regulators
102 * @num_matches: number of entries in match table
104 * This function uses a match table specified by the regulator driver to
105 * parse regulator init data from the device tree. @node is expected to
106 * contain a set of child nodes, each providing the init data for one
107 * regulator. The data parsed from a child node will be matched to a regulator
108 * based on either the deprecated property regulator-compatible if present,
109 * or otherwise the child node's name. Note that the match table is modified
112 * Returns the number of matches found or a negative error code on failure.
114 int of_regulator_match(struct device
*dev
, struct device_node
*node
,
115 struct of_regulator_match
*matches
,
116 unsigned int num_matches
)
118 unsigned int count
= 0;
121 struct device_node
*child
;
126 for (i
= 0; i
< num_matches
; i
++) {
127 struct of_regulator_match
*match
= &matches
[i
];
128 match
->init_data
= NULL
;
129 match
->of_node
= NULL
;
132 for_each_child_of_node(node
, child
) {
133 name
= of_get_property(child
,
134 "regulator-compatible", NULL
);
137 for (i
= 0; i
< num_matches
; i
++) {
138 struct of_regulator_match
*match
= &matches
[i
];
142 if (strcmp(match
->name
, name
))
146 of_get_regulator_init_data(dev
, child
);
147 if (!match
->init_data
) {
149 "failed to parse DT for regulator %s\n",
153 match
->of_node
= child
;
161 EXPORT_SYMBOL_GPL(of_regulator_match
);