fishHEADmaster

1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
new file mode 100644
index 0000000..66ca769
--- /dev/null
+++ b/drivers/regulator/of_regulator.c
@@ -0,0 +1,158 @@
+/*
+ * 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/of_regulator.h>
+
+static void of_get_regulation_constraints(struct device_node *np,
+					struct regulator_init_data **init_data)
+{
+	const __be32 *min_uV, *max_uV, *uV_offset;
+	const __be32 *min_uA, *max_uA, *ramp_delay;
+	struct regulation_constraints *constraints = &(*init_data)->constraints;
+
+	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;
+
+	uV_offset = of_get_property(np, "regulator-microvolt-offset", NULL);
+	if (uV_offset)
+		constraints->uV_offset = be32_to_cpu(*uV_offset);
+	min_uA = of_get_property(np, "regulator-min-microamp", NULL);
+	if (min_uA)
+		constraints->min_uA = be32_to_cpu(*min_uA);
+	max_uA = of_get_property(np, "regulator-max-microamp", NULL);
+	if (max_uA)
+		constraints->max_uA = be32_to_cpu(*max_uA);
+
+	/* Current change possible? */
+	if (constraints->min_uA != constraints->max_uA)
+		constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
+
+	if (of_find_property(np, "regulator-boot-on", NULL))
+		constraints->boot_on = true;
+
+	if (of_find_property(np, "regulator-always-on", NULL))
+		constraints->always_on = true;
+	else /* status change should be possible if not always on. */
+		constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
+
+	ramp_delay = of_get_property(np, "regulator-ramp-delay", NULL);
+	if (ramp_delay)
+		constraints->ramp_delay = be32_to_cpu(*ramp_delay);
+}
+
+/**
+ * of_get_regulator_init_data - extract regulator_init_data structure info
+ * @dev: device requesting for regulator_init_data
+ *
+ * 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)
+{
+	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);
+	return init_data;
+}
+EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
+
+/**
+ * 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.
+ *
+ * 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;
+
+	if (!dev || !node)
+		return -EINVAL;
+
+	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);
+			if (!match->init_data) {
+				dev_err(dev,
+					"failed to parse DT for regulator %s\n",
+					child->name);
+				return -EINVAL;
+			}
+			match->of_node = child;
+			count++;
+			break;
+		}
+	}
+
+	return count;
+}
+EXPORT_SYMBOL_GPL(of_regulator_match);