--- /dev/null
+/*
+ * OF helpers for regulator framework
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Rajendra Nayak <rnayak@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+#include "internal.h"
+
+static const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
+ [PM_SUSPEND_MEM] = "regulator-state-mem",
+ [PM_SUSPEND_MAX] = "regulator-state-disk",
+};
+
+static void of_get_regulation_constraints(struct device_node *np,
+ struct regulator_init_data **init_data,
+ const struct regulator_desc *desc)
+{
+ const __be32 *min_uV, *max_uV;
+ struct regulation_constraints *constraints = &(*init_data)->constraints;
+ struct regulator_state *suspend_state;
+ struct device_node *suspend_np;
+ int ret, i;
+ u32 pval;
+
+ constraints->name = of_get_property(np, "regulator-name", NULL);
+
+ min_uV = of_get_property(np, "regulator-min-microvolt", NULL);
+ if (min_uV)
+ constraints->min_uV = be32_to_cpu(*min_uV);
+ max_uV = of_get_property(np, "regulator-max-microvolt", NULL);
+ if (max_uV)
+ constraints->max_uV = be32_to_cpu(*max_uV);
+
+ /* Voltage change possible? */
+ if (constraints->min_uV != constraints->max_uV)
+ constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
+ /* Only one voltage? Then make sure it's set. */
+ if (min_uV && max_uV && constraints->min_uV == constraints->max_uV)
+ constraints->apply_uV = true;
+
+ if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval))
+ constraints->uV_offset = pval;
+ if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
+ constraints->min_uA = pval;
+ if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
+ constraints->max_uA = pval;
+
+ /* Current change possible? */
+ if (constraints->min_uA != constraints->max_uA)
+ constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
+
+ constraints->boot_on = of_property_read_bool(np, "regulator-boot-on");
+ constraints->always_on = of_property_read_bool(np, "regulator-always-on");
+ if (!constraints->always_on) /* status change should be possible. */
+ constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
+
+ if (of_property_read_bool(np, "regulator-allow-bypass"))
+ constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
+
+ ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
+ if (!ret) {
+ if (pval)
+ constraints->ramp_delay = pval;
+ else
+ constraints->ramp_disable = true;
+ }
+
+ ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
+ if (!ret)
+ constraints->enable_time = pval;
+
+ if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
+ if (desc && desc->of_map_mode) {
+ ret = desc->of_map_mode(pval);
+ if (ret == -EINVAL)
+ pr_err("%s: invalid mode %u\n", np->name, pval);
+ else
+ constraints->initial_mode = ret;
+ } else {
+ pr_warn("%s: mapping for mode %d not defined\n",
+ np->name, pval);
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
+ switch (i) {
+ case PM_SUSPEND_MEM:
+ suspend_state = &constraints->state_mem;
+ break;
+ case PM_SUSPEND_MAX:
+ suspend_state = &constraints->state_disk;
+ break;
+ case PM_SUSPEND_ON:
+ case PM_SUSPEND_FREEZE:
+ case PM_SUSPEND_STANDBY:
+ default:
+ continue;
+ };
+
+ suspend_np = of_get_child_by_name(np, regulator_states[i]);
+ if (!suspend_np || !suspend_state)
+ continue;
+
+ if (!of_property_read_u32(suspend_np, "regulator-mode",
+ &pval)) {
+ if (desc && desc->of_map_mode) {
+ ret = desc->of_map_mode(pval);
+ if (ret == -EINVAL)
+ pr_err("%s: invalid mode %u\n",
+ np->name, pval);
+ else
+ suspend_state->mode = ret;
+ } else {
+ pr_warn("%s: mapping for mode %d not defined\n",
+ np->name, pval);
+ }
+ }
+
+ if (of_property_read_bool(suspend_np,
+ "regulator-on-in-suspend"))
+ suspend_state->enabled = true;
+ else if (of_property_read_bool(suspend_np,
+ "regulator-off-in-suspend"))
+ suspend_state->disabled = true;
+
+ if (!of_property_read_u32(suspend_np,
+ "regulator-suspend-microvolt", &pval))
+ suspend_state->uV = pval;
+
+ of_node_put(suspend_np);
+ suspend_state = NULL;
+ suspend_np = NULL;
+ }
+}
+
+/**
+ * of_get_regulator_init_data - extract regulator_init_data structure info
+ * @dev: device requesting for regulator_init_data
+ * @node: regulator device node
+ * @desc: regulator description
+ *
+ * Populates regulator_init_data structure by extracting data from device
+ * tree node, returns a pointer to the populated struture or NULL if memory
+ * alloc fails.
+ */
+struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
+ struct device_node *node,
+ const struct regulator_desc *desc)
+{
+ struct regulator_init_data *init_data;
+
+ if (!node)
+ return NULL;
+
+ init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
+ if (!init_data)
+ return NULL; /* Out of memory? */
+
+ of_get_regulation_constraints(node, &init_data, desc);
+ return init_data;
+}
+EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
+
+struct devm_of_regulator_matches {
+ struct of_regulator_match *matches;
+ unsigned int num_matches;
+};
+
+static void devm_of_regulator_put_matches(struct device *dev, void *res)
+{
+ struct devm_of_regulator_matches *devm_matches = res;
+ int i;
+
+ for (i = 0; i < devm_matches->num_matches; i++)
+ of_node_put(devm_matches->matches[i].of_node);
+}
+
+/**
+ * of_regulator_match - extract multiple regulator init data from device tree.
+ * @dev: device requesting the data
+ * @node: parent device node of the regulators
+ * @matches: match table for the regulators
+ * @num_matches: number of entries in match table
+ *
+ * This function uses a match table specified by the regulator driver to
+ * parse regulator init data from the device tree. @node is expected to
+ * contain a set of child nodes, each providing the init data for one
+ * regulator. The data parsed from a child node will be matched to a regulator
+ * based on either the deprecated property regulator-compatible if present,
+ * or otherwise the child node's name. Note that the match table is modified
+ * in place and an additional of_node reference is taken for each matched
+ * regulator.
+ *
+ * Returns the number of matches found or a negative error code on failure.
+ */
+int of_regulator_match(struct device *dev, struct device_node *node,
+ struct of_regulator_match *matches,
+ unsigned int num_matches)
+{
+ unsigned int count = 0;
+ unsigned int i;
+ const char *name;
+ struct device_node *child;
+ struct devm_of_regulator_matches *devm_matches;
+
+ if (!dev || !node)
+ return -EINVAL;
+
+ devm_matches = devres_alloc(devm_of_regulator_put_matches,
+ sizeof(struct devm_of_regulator_matches),
+ GFP_KERNEL);
+ if (!devm_matches)
+ return -ENOMEM;
+
+ devm_matches->matches = matches;
+ devm_matches->num_matches = num_matches;
+
+ devres_add(dev, devm_matches);
+
+ for (i = 0; i < num_matches; i++) {
+ struct of_regulator_match *match = &matches[i];
+ match->init_data = NULL;
+ match->of_node = NULL;
+ }
+
+ for_each_child_of_node(node, child) {
+ name = of_get_property(child,
+ "regulator-compatible", NULL);
+ if (!name)
+ name = child->name;
+ for (i = 0; i < num_matches; i++) {
+ struct of_regulator_match *match = &matches[i];
+ if (match->of_node)
+ continue;
+
+ if (strcmp(match->name, name))
+ continue;
+
+ match->init_data =
+ of_get_regulator_init_data(dev, child,
+ match->desc);
+ if (!match->init_data) {
+ dev_err(dev,
+ "failed to parse DT for regulator %s\n",
+ child->name);
+ return -EINVAL;
+ }
+ match->of_node = of_node_get(child);
+ count++;
+ break;
+ }
+ }
+
+ return count;
+}
+EXPORT_SYMBOL_GPL(of_regulator_match);
+
+struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
+ const struct regulator_desc *desc,
+ struct regulator_config *config,
+ struct device_node **node)
+{
+ struct device_node *search, *child;
+ struct regulator_init_data *init_data = NULL;
+ const char *name;
+
+ if (!dev->of_node || !desc->of_match)
+ return NULL;
+
+ if (desc->regulators_node)
+ search = of_get_child_by_name(dev->of_node,
+ desc->regulators_node);
+ else
+ search = dev->of_node;
+
+ if (!search) {
+ dev_dbg(dev, "Failed to find regulator container node '%s'\n",
+ desc->regulators_node);
+ return NULL;
+ }
+
+ for_each_child_of_node(search, child) {
+ name = of_get_property(child, "regulator-compatible", NULL);
+ if (!name)
+ name = child->name;
+
+ if (strcmp(desc->of_match, name))
+ continue;
+
+ init_data = of_get_regulator_init_data(dev, child, desc);
+ if (!init_data) {
+ dev_err(dev,
+ "failed to parse DT for regulator %s\n",
+ child->name);
+ break;
+ }
+
+ if (desc->of_parse_cb) {
+ if (desc->of_parse_cb(child, desc, config)) {
+ dev_err(dev,
+ "driver callback failed to parse DT for regulator %s\n",
+ child->name);
+ init_data = NULL;
+ break;
+ }
+ }
+
+ of_node_get(child);
+ *node = child;
+ break;
+ }
+
+ of_node_put(search);
+
+ return init_data;
+}
Code Review / kvmfornfv.git / blobdiff