130daa3f35
If a regulator is listed in devicetree, but the node is marked as "disabled" we should skip parsing the regulator init data and deny consumers from interacting with the regulator. This simplifies devicetree maintenance where we can have one dtsi file with all regulators supported by a PMIC and then select what regulators are used depending on the board configuration. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>
330 lines
9.0 KiB
C
330 lines
9.0 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 const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
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[PM_SUSPEND_MEM] = "regulator-state-mem",
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[PM_SUSPEND_MAX] = "regulator-state-disk",
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};
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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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const struct regulator_desc *desc)
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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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struct regulator_state *suspend_state;
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struct device_node *suspend_np;
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int ret, i;
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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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if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
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if (desc && desc->of_map_mode) {
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ret = desc->of_map_mode(pval);
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if (ret == -EINVAL)
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pr_err("%s: invalid mode %u\n", np->name, pval);
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else
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constraints->initial_mode = ret;
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} else {
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pr_warn("%s: mapping for mode %d not defined\n",
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np->name, pval);
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}
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}
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for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
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switch (i) {
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case PM_SUSPEND_MEM:
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suspend_state = &constraints->state_mem;
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break;
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case PM_SUSPEND_MAX:
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suspend_state = &constraints->state_disk;
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break;
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case PM_SUSPEND_ON:
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case PM_SUSPEND_FREEZE:
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case PM_SUSPEND_STANDBY:
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default:
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continue;
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};
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suspend_np = of_get_child_by_name(np, regulator_states[i]);
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if (!suspend_np || !suspend_state)
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continue;
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if (!of_property_read_u32(suspend_np, "regulator-mode",
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&pval)) {
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if (desc && desc->of_map_mode) {
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ret = desc->of_map_mode(pval);
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if (ret == -EINVAL)
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pr_err("%s: invalid mode %u\n",
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np->name, pval);
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else
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suspend_state->mode = ret;
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} else {
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pr_warn("%s: mapping for mode %d not defined\n",
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np->name, pval);
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}
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}
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if (of_property_read_bool(suspend_np,
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"regulator-on-in-suspend"))
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suspend_state->enabled = true;
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else if (of_property_read_bool(suspend_np,
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"regulator-off-in-suspend"))
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suspend_state->disabled = true;
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if (!of_property_read_u32(suspend_np,
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"regulator-suspend-microvolt", &pval))
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suspend_state->uV = pval;
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of_node_put(suspend_np);
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suspend_state = NULL;
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suspend_np = NULL;
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}
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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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* @node: regulator device node
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* @desc: regulator description
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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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const struct regulator_desc *desc)
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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, desc);
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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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match->desc);
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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 regulator_config *config,
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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_dbg(dev, "Failed to find regulator container node '%s'\n",
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desc->regulators_node);
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return NULL;
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}
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for_each_available_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, desc);
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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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if (desc->of_parse_cb) {
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if (desc->of_parse_cb(child, desc, config)) {
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dev_err(dev,
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"driver callback failed to parse DT for regulator %s\n",
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child->name);
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init_data = NULL;
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break;
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}
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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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