[U-Boot] [PATCH v2 19/71] dm: core: Add a way to find a device by ofnode

[Simon Glass]

Add a function which looks up a device by its node (either in live tree
or flat tree).

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2: None

 drivers/core/uclass.c        | 37 +++++++++++++++++++++++++++++++++++++
 include/dm/uclass-internal.h | 16 ++++++++++++++++
 include/dm/uclass.h          | 16 ++++++++++++++++
 3 files changed, 69 insertions(+)

diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c
index 04fb45b01a..630b2e7336 100644
--- a/drivers/core/uclass.c
+++ b/drivers/core/uclass.c
@@ -8,6 +8,7 @@
  */
 
 #include <common.h>
+#include <dm.h>
 #include <errno.h>
 #include <malloc.h>
 #include <dm/device.h>
@@ -287,6 +288,30 @@ int uclass_find_device_by_of_offset(enum uclass_id id, int node,
 	return -ENODEV;
 }
 
+int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
+				 struct udevice **devp)
+{
+	struct uclass *uc;
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	if (!ofnode_valid(node))
+		return -ENODEV;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		if (ofnode_equal(dev_ofnode(dev), node)) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 static int uclass_find_device_by_phandle(enum uclass_id id,
 					 struct udevice *parent,
@@ -407,6 +432,18 @@ 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_ofnode(enum uclass_id id, ofnode node,
+				struct udevice **devp)
+{
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	ret = uclass_find_device_by_ofnode(id, node, &dev);
+
+	return uclass_get_device_tail(dev, ret, devp);
+}
+
 #if CONFIG_IS_ENABLED(OF_CONTROL)
 int uclass_get_device_by_phandle(enum uclass_id id, struct udevice *parent,
 				 const char *name, struct udevice **devp)
diff --git a/include/dm/uclass-internal.h b/include/dm/uclass-internal.h
index ad284b8445..4474cef29e 100644
--- a/include/dm/uclass-internal.h
+++ b/include/dm/uclass-internal.h
@@ -114,6 +114,22 @@ int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
 int uclass_find_device_by_of_offset(enum uclass_id id, int node,
 				    struct udevice **devp);
 
+/**
+ * uclass_find_device_by_of_node() - Find a uclass device by device tree node
+ *
+ * This searches the devices in the uclass for one attached to the given
+ * device tree node.
+ *
+ * The device is NOT probed, it is merely returned.
+ *
+ * @id: ID to look up
+ * @node: Device tree offset to search for (if NULL then -ENODEV is returned)
+ * @devp: Returns pointer to device (there is only one for each node)
+ * @return 0 if OK, -ve on error
+ */
+int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node,
+				 struct udevice **devp);
+
 /**
  * uclass_bind_device() - Associate device with a uclass
  *
diff --git a/include/dm/uclass.h b/include/dm/uclass.h
index b583aa869b..89d1f4467c 100644
--- a/include/dm/uclass.h
+++ b/include/dm/uclass.h
@@ -185,6 +185,22 @@ int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp);
 int uclass_get_device_by_of_offset(enum uclass_id id, int node,
 				   struct udevice **devp);
 
+/**
+ * uclass_get_device_by_ofnode() - Get a uclass device by device tree node
+ *
+ * This searches the devices in the uclass for one attached to the given
+ * device tree node.
+ *
+ * The device is probed to activate it ready for use.
+ *
+ * @id: ID to look up
+ * @np: Device tree node to search for (if NULL then -ENODEV is returned)
+ * @devp: Returns pointer to device (there is only one for each node)
+ * @return 0 if OK, -ve on error
+ */
+int uclass_get_device_by_ofnode(enum uclass_id id, ofnode node,
+				struct udevice **devp);
+
 /**
  * uclass_get_device_by_phandle() - Get a uclass device by phandle
  *
-- 
2.13.0.rc2.291.g57267f2277-goog