[PATCH 9/9] regulator: map consumer regulator based on device tree

[Rajendra Nayak]

Look up the regulator for a given consumer from device tree, during
a regulator_get(). If not found fallback and lookup through
the regulator_map_list instead.

Devices can associate with one or more regulators by providing a
list of phandles and supply names.

For Example:
        devicenode: node@0x0 {
                ...
                ...
                vmmc-supply = <&regulator1>;
                vpll-supply = <&regulator2>;
        };

When a device driver calls a regulator_get, specifying the
supply name, the phandle and eventually the regulator node
is extracted from the device node.

Signed-off-by: Rajendra Nayak <rna...@ti.com>
---
 drivers/regulator/core.c         |   14 ++++++++++++++
 include/linux/regulator/driver.h |    3 +++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index d8e6a42..47b851c 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -25,9 +25,11 @@
 #include <linux/mutex.h>
 #include <linux/suspend.h>
 #include <linux/delay.h>
+#include <linux/of.h>
 #include <linux/regulator/consumer.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/regulator.h>
@@ -1155,6 +1157,7 @@ static struct regulator *_regulator_get(struct device 
*dev, const char *id,
        struct regulator_map *map;
        struct regulator *regulator = ERR_PTR(-ENODEV);
        const char *devname = NULL;
+       struct device_node *node;
        int ret;
 
        if (id == NULL) {
@@ -1167,6 +1170,15 @@ static struct regulator *_regulator_get(struct device 
*dev, const char *id,
 
        mutex_lock(&regulator_list_mutex);
 
+       if (dev->of_node) {
+               node = of_get_regulator(dev, id);
+               if (!node)
+                       goto retry; /* fallback and chk regulator_map_list */
+               list_for_each_entry(rdev, &regulator_list, list)
+                       if (node == rdev->node)
+                               goto found;
+       }
+retry:
        list_for_each_entry(map, &regulator_map_list, list) {
                /* If the mapping has a device set up it must match */
                if (map->dev_name &&
@@ -2619,6 +2631,8 @@ struct regulator_dev *regulator_register(struct 
regulator_desc *regulator_desc,
        rdev->reg_data = driver_data;
        rdev->owner = regulator_desc->owner;
        rdev->desc = regulator_desc;
+       if (dev && dev->of_node)
+               rdev->node = dev->of_node;
        INIT_LIST_HEAD(&rdev->consumer_list);
        INIT_LIST_HEAD(&rdev->list);
        BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 1a80bc7..4aebbf5 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -196,6 +196,9 @@ struct regulator_dev {
        struct mutex mutex; /* consumer lock */
        struct module *owner;
        struct device dev;
+#ifdef CONFIG_OF
+       struct device_node *node;
+#endif
        struct regulation_constraints *constraints;
        struct regulator *supply;       /* for tree */
 
-- 
1.7.1

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