It is common for one node to reference another via a phandle. Add support
for obtaining an attached device by this method. As an example, a node may
have a 'power-supply' property which references a regulator, allowing the
driver to turn on its power.
Signed-off-by: Simon Glass <s...@chromium.org>
---
drivers/core/uclass.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/dm/uclass.h | 17 +++++++++++++++++
2 files changed, 59 insertions(+)
diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 7de8173..89532db 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -271,6 +271,37 @@ static int uclass_find_device_by_of_offset(enum uclass_id
id, int node,
return -ENODEV;
}
+static int uclass_find_device_by_phandle(enum uclass_id id,
+ struct udevice *parent,
+ const char *name,
+ struct udevice **devp)
+{
+ struct udevice *dev;
+ struct uclass *uc;
+ int find_phandle;
+ int ret;
+
+ *devp = NULL;
+ find_phandle = fdtdec_get_int(gd->fdt_blob, parent->of_offset, name,
+ -1);
+ if (find_phandle <= 0)
+ return -ENOENT;
+ ret = uclass_get(id, &uc);
+ if (ret)
+ return ret;
+
+ list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+ uint phandle = fdt_get_phandle(gd->fdt_blob, dev->of_offset);
+
+ if (phandle == find_phandle) {
+ *devp = dev;
+ return 0;
+ }
+ }
+
+ return -ENODEV;
+}
+
int uclass_get_device_tail(struct udevice *dev, int ret,
struct udevice **devp)
{
@@ -336,6 +367,17 @@ int uclass_get_device_by_of_offset(enum uclass_id id, int
node,
return uclass_get_device_tail(dev, ret, devp);
}
+int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
+ const char *name, struct udevice **devp)
+{
+ struct udevice *dev;
+ int ret;
+
+ *devp = NULL;
+ ret = uclass_find_device_by_phandle(id, parent, name, &dev);
+ return uclass_get_device_tail(dev, ret, devp);
+}
+
int uclass_first_device(enum uclass_id id, struct udevice **devp)
{
struct udevice *dev;
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index 4cfc0df..3fe1739 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -177,6 +177,23 @@ int uclass_get_device_by_of_offset(enum uclass_id id, int
node,
struct udevice **devp);
/**
+ * uclass_get_device_by_phandle() - Get a uclass device by phandle
+ *
+ * This searches the devices in the uclass for one with the given phandle.
+ *
+ * The device is probed to activate it ready for use.
+ *
+ * @id: uclass ID to look up
+ * @parent: Parent device containing the phandle pointer
+ * @name: Name of property in the parent device node
+ * @devp: Returns pointer to device (there is only one for each node)
+ * @return 0 if OK, -ENOENT if there is no @name present in the node, other
+ * -ve on error
+ */
+int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
+ const char *name, struct udevice **devp);
+
+/**
* uclass_first_device() - Get the first device in a uclass
*
* The device returned is probed if necessary, and ready for use
--
2.4.3.573.g4eafbef
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