1 files changed, 586 insertions, 0 deletions

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
new file mode 100644
index 000000000..b255590ae
--- /dev/null
+++ b/drivers/regulator/of_regulator.c
@@ -0,0 +1,586 @@
+/*
+ * 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)
+{
+	struct regulation_constraints *constraints = &(*init_data)->constraints;
+	struct regulator_state *suspend_state;
+	struct device_node *suspend_np;
+	unsigned int mode;
+	int ret, i, len;
+	u32 pval;
+
+	constraints->name = of_get_property(np, "regulator-name", NULL);
+
+	if (!of_property_read_u32(np, "regulator-min-microvolt", &pval))
+		constraints->min_uV = pval;
+
+	if (!of_property_read_u32(np, "regulator-max-microvolt", &pval))
+		constraints->max_uV = pval;
+
+	/* Voltage change possible? */
+	if (constraints->min_uV != constraints->max_uV)
+		constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
+
+	/* Do we have a voltage range, if so try to apply it? */
+	if (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;
+
+	if (!of_property_read_u32(np, "regulator-input-current-limit-microamp",
+				  &pval))
+		constraints->ilim_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;
+
+	constraints->pull_down = of_property_read_bool(np, "regulator-pull-down");
+
+	if (of_property_read_bool(np, "regulator-allow-bypass"))
+		constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
+
+	if (of_property_read_bool(np, "regulator-allow-set-load"))
+		constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS;
+
+	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-settling-time-us", &pval);
+	if (!ret)
+		constraints->settling_time = pval;
+
+	ret = of_property_read_u32(np, "regulator-settling-time-up-us", &pval);
+	if (!ret)
+		constraints->settling_time_up = pval;
+	if (constraints->settling_time_up && constraints->settling_time) {
+		pr_warn("%s: ambiguous configuration for settling time, ignoring 'regulator-settling-time-up-us'\n",
+			np->name);
+		constraints->settling_time_up = 0;
+	}
+
+	ret = of_property_read_u32(np, "regulator-settling-time-down-us",
+				   &pval);
+	if (!ret)
+		constraints->settling_time_down = pval;
+	if (constraints->settling_time_down && constraints->settling_time) {
+		pr_warn("%s: ambiguous configuration for settling time, ignoring 'regulator-settling-time-down-us'\n",
+			np->name);
+		constraints->settling_time_down = 0;
+	}
+
+	ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
+	if (!ret)
+		constraints->enable_time = pval;
+
+	constraints->soft_start = of_property_read_bool(np,
+					"regulator-soft-start");
+	ret = of_property_read_u32(np, "regulator-active-discharge", &pval);
+	if (!ret) {
+		constraints->active_discharge =
+				(pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
+					REGULATOR_ACTIVE_DISCHARGE_DISABLE;
+	}
+
+	if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
+		if (desc && desc->of_map_mode) {
+			mode = desc->of_map_mode(pval);
+			if (mode == REGULATOR_MODE_INVALID)
+				pr_err("%s: invalid mode %u\n", np->name, pval);
+			else
+				constraints->initial_mode = mode;
+		} else {
+			pr_warn("%s: mapping for mode %d not defined\n",
+				np->name, pval);
+		}
+	}
+
+	len = of_property_count_elems_of_size(np, "regulator-allowed-modes",
+						sizeof(u32));
+	if (len > 0) {
+		if (desc && desc->of_map_mode) {
+			for (i = 0; i < len; i++) {
+				ret = of_property_read_u32_index(np,
+					"regulator-allowed-modes", i, &pval);
+				if (ret) {
+					pr_err("%s: couldn't read allowed modes index %d, ret=%d\n",
+						np->name, i, ret);
+					break;
+				}
+				mode = desc->of_map_mode(pval);
+				if (mode == REGULATOR_MODE_INVALID)
+					pr_err("%s: invalid regulator-allowed-modes element %u\n",
+						np->name, pval);
+				else
+					constraints->valid_modes_mask |= mode;
+			}
+			if (constraints->valid_modes_mask)
+				constraints->valid_ops_mask
+					|= REGULATOR_CHANGE_MODE;
+		} else {
+			pr_warn("%s: mode mapping not defined\n", np->name);
+		}
+	}
+
+	if (!of_property_read_u32(np, "regulator-system-load", &pval))
+		constraints->system_load = pval;
+
+	if (!of_property_read_u32(np, "regulator-coupled-max-spread",
+				  &pval))
+		constraints->max_spread = pval;
+
+	constraints->over_current_protection = of_property_read_bool(np,
+					"regulator-over-current-protection");
+
+	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_TO_IDLE:
+		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) {
+				mode = desc->of_map_mode(pval);
+				if (mode == REGULATOR_MODE_INVALID)
+					pr_err("%s: invalid mode %u\n",
+					       np->name, pval);
+				else
+					suspend_state->mode = mode;
+			} 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 = ENABLE_IN_SUSPEND;
+		else if (of_property_read_bool(suspend_np,
+					"regulator-off-in-suspend"))
+			suspend_state->enabled = DISABLE_IN_SUSPEND;
+
+		if (!of_property_read_u32(suspend_np,
+				"regulator-suspend-min-microvolt", &pval))
+			suspend_state->min_uV = pval;
+
+		if (!of_property_read_u32(suspend_np,
+				"regulator-suspend-max-microvolt", &pval))
+			suspend_state->max_uV = pval;
+
+		if (!of_property_read_u32(suspend_np,
+					"regulator-suspend-microvolt", &pval))
+			suspend_state->uV = pval;
+		else /* otherwise use min_uV as default suspend voltage */
+			suspend_state->uV = suspend_state->min_uV;
+
+		if (of_property_read_bool(suspend_np,
+					"regulator-changeable-in-suspend"))
+			suspend_state->changeable = true;
+
+		if (i == PM_SUSPEND_MEM)
+			constraints->initial_state = PM_SUSPEND_MEM;
+
+		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);
+				of_node_put(child);
+				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 = of_node_get(dev->of_node);
+
+	if (!search) {
+		dev_dbg(dev, "Failed to find regulator container node '%s'\n",
+			desc->regulators_node);
+		return NULL;
+	}
+
+	for_each_available_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;
+}
+
+static int of_node_match(struct device *dev, const void *data)
+{
+	return dev->of_node == data;
+}
+
+struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
+{
+	struct device *dev;
+
+	dev = class_find_device(&regulator_class, NULL, np, of_node_match);
+
+	return dev ? dev_to_rdev(dev) : NULL;
+}
+
+/*
+ * Returns number of regulators coupled with rdev.
+ */
+int of_get_n_coupled(struct regulator_dev *rdev)
+{
+	struct device_node *node = rdev->dev.of_node;
+	int n_phandles;
+
+	n_phandles = of_count_phandle_with_args(node,
+						"regulator-coupled-with",
+						NULL);
+
+	return (n_phandles > 0) ? n_phandles : 0;
+}
+
+/* Looks for "to_find" device_node in src's "regulator-coupled-with" property */
+static bool of_coupling_find_node(struct device_node *src,
+				  struct device_node *to_find)
+{
+	int n_phandles, i;
+	bool found = false;
+
+	n_phandles = of_count_phandle_with_args(src,
+						"regulator-coupled-with",
+						NULL);
+
+	for (i = 0; i < n_phandles; i++) {
+		struct device_node *tmp = of_parse_phandle(src,
+					   "regulator-coupled-with", i);
+
+		if (!tmp)
+			break;
+
+		/* found */
+		if (tmp == to_find)
+			found = true;
+
+		of_node_put(tmp);
+
+		if (found)
+			break;
+	}
+
+	return found;
+}
+
+/**
+ * of_check_coupling_data - Parse rdev's coupling properties and check data
+ *			    consistency
+ * @rdev - pointer to regulator_dev whose data is checked
+ *
+ * Function checks if all the following conditions are met:
+ * - rdev's max_spread is greater than 0
+ * - all coupled regulators have the same max_spread
+ * - all coupled regulators have the same number of regulator_dev phandles
+ * - all regulators are linked to each other
+ *
+ * Returns true if all conditions are met.
+ */
+bool of_check_coupling_data(struct regulator_dev *rdev)
+{
+	int max_spread = rdev->constraints->max_spread;
+	struct device_node *node = rdev->dev.of_node;
+	int n_phandles = of_get_n_coupled(rdev);
+	struct device_node *c_node;
+	int i;
+	bool ret = true;
+
+	if (max_spread <= 0) {
+		dev_err(&rdev->dev, "max_spread value invalid\n");
+		return false;
+	}
+
+	/* iterate over rdev's phandles */
+	for (i = 0; i < n_phandles; i++) {
+		int c_max_spread, c_n_phandles;
+
+		c_node = of_parse_phandle(node,
+					  "regulator-coupled-with", i);
+
+		if (!c_node)
+			ret = false;
+
+		c_n_phandles = of_count_phandle_with_args(c_node,
+							  "regulator-coupled-with",
+							  NULL);
+
+		if (c_n_phandles != n_phandles) {
+			dev_err(&rdev->dev, "number of couped reg phandles mismatch\n");
+			ret = false;
+			goto clean;
+		}
+
+		if (of_property_read_u32(c_node, "regulator-coupled-max-spread",
+					 &c_max_spread)) {
+			ret = false;
+			goto clean;
+		}
+
+		if (c_max_spread != max_spread) {
+			dev_err(&rdev->dev,
+				"coupled regulators max_spread mismatch\n");
+			ret = false;
+			goto clean;
+		}
+
+		if (!of_coupling_find_node(c_node, node)) {
+			dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n");
+			ret = false;
+		}
+
+clean:
+		of_node_put(c_node);
+		if (!ret)
+			break;
+	}
+
+	return ret;
+}
+
+/**
+ * of_parse_coupled regulator - Get regulator_dev pointer from rdev's property
+ * @rdev: Pointer to regulator_dev, whose DTS is used as a source to parse
+ *	  "regulator-coupled-with" property
+ * @index: Index in phandles array
+ *
+ * Returns the regulator_dev pointer parsed from DTS. If it has not been yet
+ * registered, returns NULL
+ */
+struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev,
+						 int index)
+{
+	struct device_node *node = rdev->dev.of_node;
+	struct device_node *c_node;
+	struct regulator_dev *c_rdev;
+
+	c_node = of_parse_phandle(node, "regulator-coupled-with", index);
+	if (!c_node)
+		return NULL;
+
+	c_rdev = of_find_regulator_by_node(c_node);
+
+	of_node_put(c_node);
+
+	return c_rdev;
+}