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Subject[PATCH 2/2] regulator: core: Add the device tree version to the regulator_get family
Date
This patch adds the device tree version (of_) for each member of the
regulator_get family: normal, exclusive, optional and all of the
manageable version.

The of_regulator_get* functions allow using a device node to get the
regulator instead using the device object. It is needed for the
regulator associated to a child node which is not a device, it is the
case of the SATA ports of an ahci controller for instance.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
drivers/regulator/core.c | 114 +++++++++++++++++++++++++++++++++----
drivers/regulator/devres.c | 70 ++++++++++++++++++++---
include/linux/regulator/consumer.h | 20 +++++++
3 files changed, 187 insertions(+), 17 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index de29399b5430..74167b98797a 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -127,26 +127,37 @@ static bool have_full_constraints(void)

/**
* of_get_regulator - get a regulator device node based on supply name
+ * and on device node if provided
+ *
* @dev: Device pointer for the consumer (of regulator) device
+ * @np: Device tree node pointer on the node containing the regulator
* @supply: regulator supply name
*
* Extract the regulator device node corresponding to the supply name.
* returns the device node corresponding to the regulator if found, else
* returns NULL.
*/
-static struct device_node *of_get_regulator(struct device *dev, const char *supply)
+static struct device_node *of_get_regulator_by_node(struct device *dev,
+ const char *supply,
+ struct device_node *np)
{
struct device_node *regnode = NULL;
char prop_name[32]; /* 32 is max size of property name */
+ struct device_node *node;
+
+ if (np)
+ node = np;
+ else
+ node = dev->of_node;

dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);

snprintf(prop_name, 32, "%s-supply", supply);
- regnode = of_parse_phandle(dev->of_node, prop_name, 0);
+ regnode = of_parse_phandle(node, prop_name, 0);

if (!regnode) {
dev_dbg(dev, "Looking up %s property in node %s failed",
- prop_name, dev->of_node->full_name);
+ prop_name, node->full_name);
return NULL;
}
return regnode;
@@ -1268,6 +1279,7 @@ static void regulator_supply_alias(struct device **dev, const char **supply)

static struct regulator_dev *regulator_dev_lookup(struct device *dev,
const char *supply,
+ struct device_node *np,
int *ret)
{
struct regulator_dev *r;
@@ -1278,8 +1290,8 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
regulator_supply_alias(&dev, &supply);

/* first do a dt based lookup */
- if (dev && dev->of_node) {
- node = of_get_regulator(dev, supply);
+ if ((dev && dev->of_node) || np) {
+ node = of_get_regulator_by_node(dev, supply, np);
if (node) {
list_for_each_entry(r, &regulator_list, list)
if (r->dev.parent &&
@@ -1322,6 +1334,7 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,

/* Internal regulator request function */
static struct regulator *_regulator_get(struct device *dev, const char *id,
+ struct device_node *node,
bool exclusive, bool allow_dummy)
{
struct regulator_dev *rdev;
@@ -1344,7 +1357,7 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,

mutex_lock(&regulator_list_mutex);

- rdev = regulator_dev_lookup(dev, id, &ret);
+ rdev = regulator_dev_lookup(dev, id, node, &ret);
if (rdev)
goto found;

@@ -1431,7 +1444,7 @@ out:
*/
struct regulator *regulator_get(struct device *dev, const char *id)
{
- return _regulator_get(dev, id, false, true);
+ return _regulator_get(dev, id, NULL, false, true);
}
EXPORT_SYMBOL_GPL(regulator_get);

@@ -1458,7 +1471,7 @@ EXPORT_SYMBOL_GPL(regulator_get);
*/
struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
{
- return _regulator_get(dev, id, true, false);
+ return _regulator_get(dev, id, NULL, true, false);
}
EXPORT_SYMBOL_GPL(regulator_get_exclusive);

@@ -1484,10 +1497,91 @@ EXPORT_SYMBOL_GPL(regulator_get_exclusive);
*/
struct regulator *regulator_get_optional(struct device *dev, const char *id)
{
- return _regulator_get(dev, id, false, false);
+ return _regulator_get(dev, id, NULL, false, false);
}
EXPORT_SYMBOL_GPL(regulator_get_optional);

+/**
+ * of_regulator_get - lookup and obtain a reference to a regulator.
+ * @dev: device for regulator "consumer"
+ * @node: device node for which to get the regulator
+ * @id: Supply name or regulator ID.
+ *
+ * Returns a struct regulator corresponding to the regulator producer,
+ * or IS_ERR() condition containing errno.
+ *
+ * Use of supply names configured via regulator_set_device_supply() is
+ * strongly encouraged. It is recommended that the supply name used
+ * should match the name used for the supply and/or the relevant
+ * device pins in the datasheet.
+ */
+struct regulator *of_regulator_get(struct device *dev,
+ const char *id,
+ struct device_node *node)
+{
+ return _regulator_get(dev, id, node, false, true);
+}
+EXPORT_SYMBOL_GPL(of_regulator_get);
+
+/**
+ * of_regulator_get_exclusive - obtain exclusive access to a regulator.
+ * @dev: device for regulator "consumer"
+ * @node: device node for which to get the regulator
+ * @id: Supply name or regulator ID.
+ *
+ * Returns a struct regulator corresponding to the regulator producer,
+ * or IS_ERR() condition containing errno. Other consumers will be
+ * unable to obtain this regulator while this reference is held and the
+ * use count for the regulator will be initialised to reflect the current
+ * state of the regulator.
+ *
+ * This is intended for use by consumers which cannot tolerate shared
+ * use of the regulator such as those which need to force the
+ * regulator off for correct operation of the hardware they are
+ * controlling.
+ *
+ * Use of supply names configured via regulator_set_device_supply() is
+ * strongly encouraged. It is recommended that the supply name used
+ * should match the name used for the supply and/or the relevant
+ * device pins in the datasheet.
+ */
+struct regulator *of_regulator_get_exclusive(struct device *dev,
+ const char *id,
+ struct device_node *node)
+{
+ return _regulator_get(dev, id, node, true, false);
+}
+EXPORT_SYMBOL_GPL(of_regulator_get_exclusive);
+
+/**
+ * of_regulator_get_optional - obtain optional access to a regulator.
+ * @dev: device for regulator "consumer"
+ * @node: device node for which to get the regulator
+ * @id: Supply name or regulator ID.
+ *
+ * Returns a struct regulator corresponding to the regulator producer,
+ * or IS_ERR() condition containing errno.
+ *
+ * This is intended for use by consumers for devices which can have
+ * some supplies unconnected in normal use, such as some MMC devices.
+ * It can allow the regulator core to provide stub supplies for other
+ * supplies requested using normal regulator_get() calls without
+ * disrupting the operation of drivers that can handle absent
+ * supplies.
+ *
+ * Use of supply names configured via regulator_set_device_supply() is
+ * strongly encouraged. It is recommended that the supply name used
+ * should match the name used for the supply and/or the relevant
+ * device pins in the datasheet.
+ */
+struct regulator *of_regulator_get_optional(struct device *dev,
+ const char *id,
+ struct device_node *node)
+{
+ return _regulator_get(dev, id, node, false, false);
+}
+EXPORT_SYMBOL_GPL(of_regulator_get_optional);
+
/* Locks held by regulator_put() */
static void _regulator_put(struct regulator *regulator)
{
@@ -3714,7 +3808,7 @@ regulator_register(const struct regulator_desc *regulator_desc,
if (supply) {
struct regulator_dev *r;

- r = regulator_dev_lookup(dev, supply, &ret);
+ r = regulator_dev_lookup(dev, supply, NULL, &ret);

if (ret == -ENODEV) {
/*
diff --git a/drivers/regulator/devres.c b/drivers/regulator/devres.c
index 8f785bc9e510..755fc07ebc33 100644
--- a/drivers/regulator/devres.c
+++ b/drivers/regulator/devres.c
@@ -30,7 +30,9 @@ static void devm_regulator_release(struct device *dev, void *res)
regulator_put(*(struct regulator **)res);
}

-static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
+static struct regulator *_devm_regulator_get(struct device *dev,
+ const char *id,
+ struct device_node *node,
int get_type)
{
struct regulator **ptr, *regulator;
@@ -41,13 +43,13 @@ static struct regulator *_devm_regulator_get(struct device *dev, const char *id,

switch (get_type) {
case NORMAL_GET:
- regulator = regulator_get(dev, id);
+ regulator = of_regulator_get(dev, id, node);
break;
case EXCLUSIVE_GET:
- regulator = regulator_get_exclusive(dev, id);
+ regulator = of_regulator_get_exclusive(dev, id, node);
break;
case OPTIONAL_GET:
- regulator = regulator_get_optional(dev, id);
+ regulator = of_regulator_get_optional(dev, id, node);
break;
default:
regulator = ERR_PTR(-EINVAL);
@@ -74,7 +76,7 @@ static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
*/
struct regulator *devm_regulator_get(struct device *dev, const char *id)
{
- return _devm_regulator_get(dev, id, NORMAL_GET);
+ return _devm_regulator_get(dev, id, NULL, NORMAL_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get);

@@ -90,7 +92,7 @@ EXPORT_SYMBOL_GPL(devm_regulator_get);
struct regulator *devm_regulator_get_exclusive(struct device *dev,
const char *id)
{
- return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
+ return _devm_regulator_get(dev, id, NULL, EXCLUSIVE_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);

@@ -106,10 +108,64 @@ EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
struct regulator *devm_regulator_get_optional(struct device *dev,
const char *id)
{
- return _devm_regulator_get(dev, id, OPTIONAL_GET);
+ return _devm_regulator_get(dev, id, NULL, OPTIONAL_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get_optional);

+/**
+ * devm_regulator_get - Resource managed regulator_get()
+ * @dev: device for regulator "consumer"
+ * @node: device node for which to get the regulator
+ * @id: Supply name or regulator ID.
+ *
+ * Managed regulator_get(). Regulators returned from this function are
+ * automatically regulator_put() on driver detach. See regulator_get()
+ * for more information.
+ */
+struct regulator *devm_of_regulator_get(struct device *dev,
+ const char *id,
+ struct device_node *node)
+{
+ return _devm_regulator_get(dev, id, node, NORMAL_GET);
+}
+EXPORT_SYMBOL_GPL(devm_of_regulator_get);
+
+/**
+ * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
+ * @dev: device for regulator "consumer"
+ * @node: device node for which to get the regulator
+ * @id: Supply name or regulator ID.
+ *
+ * Managed regulator_get_exclusive(). Regulators returned from this
+ * function are automatically regulator_put() on driver detach. See
+ * regulator_get_exclusive() for more information.
+ */
+struct regulator *devm_of_regulator_get_exclusive(struct device *dev,
+ const char *id,
+ struct device_node *node)
+{
+ return _devm_regulator_get(dev, id, node, EXCLUSIVE_GET);
+}
+EXPORT_SYMBOL_GPL(devm_of_regulator_get_exclusive);
+
+/**
+ * devm_regulator_get_optional - Resource managed regulator_get_optional()
+ * @dev: device for regulator "consumer"
+ * @node: device node for which to get the regulator
+ * @id: Supply name or regulator ID.
+ *
+ * Managed regulator_get_optional(). Regulators returned from this
+ * function are automatically regulator_put() on driver detach. See
+ * regulator_get_optional() for more information.
+ */
+struct regulator *devm_of_regulator_get_optional(struct device *dev,
+ const char *id,
+ struct device_node *node)
+{
+ return _devm_regulator_get(dev, id, node, OPTIONAL_GET);
+}
+EXPORT_SYMBOL_GPL(devm_of_regulator_get_optional);
+
static int devm_regulator_match(struct device *dev, void *res, void *data)
{
struct regulator **r = res;
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index d17e1ff7ad01..1c88ce1aaa3f 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -40,6 +40,7 @@
struct device;
struct notifier_block;
struct regmap;
+struct device_node;

/*
* Regulator operating modes.
@@ -162,14 +163,33 @@ struct regulator *__must_check regulator_get(struct device *dev,
const char *id);
struct regulator *__must_check devm_regulator_get(struct device *dev,
const char *id);
+struct regulator *__must_check of_regulator_get(struct device *dev,
+ const char *id,
+ struct device_node *node);
+struct regulator *__must_check devm_of_regulator_get(struct device *dev,
+ const char *id,
+ struct device_node *node);
struct regulator *__must_check regulator_get_exclusive(struct device *dev,
const char *id);
struct regulator *__must_check devm_regulator_get_exclusive(struct device *dev,
const char *id);
+struct regulator *__must_check of_regulator_get_exclusive(struct device *dev,
+ const char *id,
+ struct device_node *node);
+struct regulator *__must_check devm_of_regulator_get_exclusive(struct device *dev,
+ const char *id,
+ struct device_node *node);
struct regulator *__must_check regulator_get_optional(struct device *dev,
const char *id);
struct regulator *__must_check devm_regulator_get_optional(struct device *dev,
const char *id);
+struct regulator *__must_check of_regulator_get_optional(struct device *dev,
+ const char *id,
+ struct device_node *node);
+struct regulator *__must_check devm_of_regulator_get_optional(struct device *dev,
+ const char *id,
+ struct device_node *node);
+
void regulator_put(struct regulator *regulator);
void devm_regulator_put(struct regulator *regulator);

--
1.9.1


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