![Mark Brown](/assets/img/avatar_default.png)
Currently regulator drivers which support DT all repeat very similar code to supply a list of known regulator identifiers to be matched with DT, convert that to platform data which is then matched up with the regulators as they are registered. This is both fiddly to get right and for devices which can use the standard helpers to provide their operations is the main source of code in the driver. Since this code is essentially identical for most drivers we can factor it out into the core, moving the identifiers in the match table into the regulator descriptors and also allowing drivers to pass in the name of the subnode to search. When a driver provides an of_match string for the regulator the core will attempt to use that to obtain init_data, allowing the driver to remove all explicit code for DT parsing and simply provide data instead. The current code leaks the phandles for the child nodes, this will be addressed incrementally and makes no practical difference for FDT anyway as the DT data structures are never freed. Signed-off-by: Mark Brown <broonie@linaro.org>
243 lines
6.8 KiB
C
243 lines
6.8 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/driver.h>
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#include <linux/regulator/of_regulator.h>
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#include "internal.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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struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
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const struct regulator_desc *desc,
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struct device_node **node)
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{
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struct device_node *search, *child;
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struct regulator_init_data *init_data = NULL;
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const char *name;
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if (!dev->of_node || !desc->of_match)
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return NULL;
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if (desc->regulators_node)
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search = of_get_child_by_name(dev->of_node,
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desc->regulators_node);
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else
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search = dev->of_node;
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if (!search) {
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dev_err(dev, "Failed to find regulator container node\n");
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return NULL;
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}
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for_each_child_of_node(search, child) {
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name = of_get_property(child, "regulator-compatible", NULL);
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if (!name)
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name = child->name;
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if (strcmp(desc->of_match, name))
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continue;
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init_data = of_get_regulator_init_data(dev, child);
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if (!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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break;
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}
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of_node_get(child);
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*node = child;
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break;
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}
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of_node_put(search);
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return init_data;
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}
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