mirror of https://gitee.com/openkylin/linux.git
192 lines
5.7 KiB
C
192 lines
5.7 KiB
C
/*
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* OF helpers for regulator framework
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Rajendra Nayak <rnayak@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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static void of_get_regulation_constraints(struct device_node *np,
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struct regulator_init_data **init_data)
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{
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const __be32 *min_uV, *max_uV;
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struct regulation_constraints *constraints = &(*init_data)->constraints;
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int ret;
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u32 pval;
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constraints->name = of_get_property(np, "regulator-name", NULL);
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min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
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if (min_uV)
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constraints->min_uV = be32_to_cpu(*min_uV);
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max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
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if (max_uV)
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constraints->max_uV = be32_to_cpu(*max_uV);
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/* Voltage change possible? */
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if (constraints->min_uV != constraints->max_uV)
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constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
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/* Only one voltage? Then make sure it's set. */
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if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
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constraints->apply_uV = true;
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if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval))
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constraints->uV_offset = pval;
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if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
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constraints->min_uA = pval;
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if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
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constraints->max_uA = pval;
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/* Current change possible? */
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if (constraints->min_uA != constraints->max_uA)
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constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
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constraints->boot_on = of_property_read_bool(np, "regulator-boot-on");
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constraints->always_on = of_property_read_bool(np, "regulator-always-on");
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if (!constraints->always_on) /* status change should be possible. */
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constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
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if (of_property_read_bool(np, "regulator-allow-bypass"))
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constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
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ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
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if (!ret) {
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if (pval)
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constraints->ramp_delay = pval;
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else
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constraints->ramp_disable = true;
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}
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ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
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if (!ret)
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constraints->enable_time = pval;
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}
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/**
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* of_get_regulator_init_data - extract regulator_init_data structure info
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* @dev: device requesting for regulator_init_data
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*
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* Populates regulator_init_data structure by extracting data from device
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* tree node, returns a pointer to the populated struture or NULL if memory
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* alloc fails.
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*/
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struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
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struct device_node *node)
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{
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struct regulator_init_data *init_data;
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if (!node)
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return NULL;
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init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
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if (!init_data)
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return NULL; /* Out of memory? */
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of_get_regulation_constraints(node, &init_data);
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return init_data;
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}
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EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
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struct devm_of_regulator_matches {
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struct of_regulator_match *matches;
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unsigned int num_matches;
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};
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static void devm_of_regulator_put_matches(struct device *dev, void *res)
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{
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struct devm_of_regulator_matches *devm_matches = res;
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int i;
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for (i = 0; i < devm_matches->num_matches; i++)
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of_node_put(devm_matches->matches[i].of_node);
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}
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/**
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* of_regulator_match - extract multiple regulator init data from device tree.
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* @dev: device requesting the data
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* @node: parent device node of the regulators
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* @matches: match table for the regulators
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* @num_matches: number of entries in match table
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*
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* This function uses a match table specified by the regulator driver to
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* parse regulator init data from the device tree. @node is expected to
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* contain a set of child nodes, each providing the init data for one
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* regulator. The data parsed from a child node will be matched to a regulator
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* based on either the deprecated property regulator-compatible if present,
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* or otherwise the child node's name. Note that the match table is modified
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* in place and an additional of_node reference is taken for each matched
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* regulator.
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*
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* Returns the number of matches found or a negative error code on failure.
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*/
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int of_regulator_match(struct device *dev, struct device_node *node,
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struct of_regulator_match *matches,
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unsigned int num_matches)
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{
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unsigned int count = 0;
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unsigned int i;
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const char *name;
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struct device_node *child;
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struct devm_of_regulator_matches *devm_matches;
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if (!dev || !node)
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return -EINVAL;
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devm_matches = devres_alloc(devm_of_regulator_put_matches,
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sizeof(struct devm_of_regulator_matches),
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GFP_KERNEL);
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if (!devm_matches)
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return -ENOMEM;
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devm_matches->matches = matches;
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devm_matches->num_matches = num_matches;
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devres_add(dev, devm_matches);
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for (i = 0; i < num_matches; i++) {
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struct of_regulator_match *match = &matches[i];
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match->init_data = NULL;
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match->of_node = NULL;
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}
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for_each_child_of_node(node, child) {
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name = of_get_property(child,
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"regulator-compatible", NULL);
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if (!name)
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name = child->name;
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for (i = 0; i < num_matches; i++) {
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struct of_regulator_match *match = &matches[i];
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if (match->of_node)
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continue;
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if (strcmp(match->name, name))
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continue;
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match->init_data =
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of_get_regulator_init_data(dev, child);
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if (!match->init_data) {
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dev_err(dev,
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"failed to parse DT for regulator %s\n",
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child->name);
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return -EINVAL;
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}
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match->of_node = of_node_get(child);
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count++;
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break;
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}
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}
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return count;
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}
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EXPORT_SYMBOL_GPL(of_regulator_match);
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