dm: core: uclass: add function: uclass_find_device_by_name()

This commit extends the driver model uclass's API by function:
- uclass_find_device_by_name()

And this function returns the device if:
- uclass with given ID, exists,
- device with exactly given name(dev->name), exists.

The returned device is not activated - need to be probed before use.

Note:
This function returns the first device, which name is equal
to the given one. This means, that using this function you must
assume, that the device name is unique in the given uclass's ID
device list.

uclass-internal.h: cleanup - move the uclass_find_device_by_seq()
declaration and description, near the other uclass_find*() functions.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

drivers/core/uclass.c

@@ -186,6 +186,30 @@ int uclass_find_next_device(struct udevice **devp)
 	return 0;
 }
 
+int uclass_find_device_by_name(enum uclass_id id, const char *name,
+			       struct udevice **devp)
+{
+	struct uclass *uc;
+	struct udevice *dev;
+	int ret;
+
+	*devp = NULL;
+	if (!name)
+		return -EINVAL;
+	ret = uclass_get(id, &uc);
+	if (ret)
+		return ret;
+
+	list_for_each_entry(dev, &uc->dev_head, uclass_node) {
+		if (!strncmp(dev->name, name, strlen(name))) {
+			*devp = dev;
+			return 0;
+		}
+	}
+
+	return -ENODEV;
+}
+
 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
 			      bool find_req_seq, struct udevice **devp)
 {

include/dm/uclass-internal.h

@@ -45,6 +45,44 @@ int uclass_find_first_device(enum uclass_id id, struct udevice **devp);
  */
 int uclass_find_next_device(struct udevice **devp);
 
+/**
+ * uclass_find_device_by_name() - Find uclass device based on ID and name
+ *
+ * This searches for a device with the given name.
+ *
+ * The device is NOT probed, it is merely returned.
+ *
+ * @id: ID to look up
+ * @name: name of a device to find
+ * @devp: Returns pointer to device (the first one with the name)
+ * @return 0 if OK, -ve on error
+ */
+int uclass_find_device_by_name(enum uclass_id id, const char *name,
+			       struct udevice **devp);
+
+/**
+ * uclass_find_device_by_seq() - Find uclass device based on ID and sequence
+ *
+ * This searches for a device with the given seq or req_seq.
+ *
+ * For seq, if an active device has this sequence it will be returned.
+ * If there is no such device then this will return -ENODEV.
+ *
+ * For req_seq, if a device (whether activated or not) has this req_seq
+ * value, that device will be returned. This is a strong indication that
+ * the device will receive that sequence when activated.
+ *
+ * The device is NOT probed, it is merely returned.
+ *
+ * @id: ID to look up
+ * @seq_or_req_seq: Sequence number to find (0=first)
+ * @find_req_seq: true to find req_seq, false to find seq
+ * @devp: Returns pointer to device (there is only one per for each seq)
+ * @return 0 if OK, -ve on error
+ */
+int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
+			      bool find_req_seq, struct udevice **devp);
+
 /**
  * uclass_bind_device() - Associate device with a uclass
  *
@@ -116,27 +154,4 @@ struct uclass *uclass_find(enum uclass_id key);
  */
 int uclass_destroy(struct uclass *uc);
 
-/**
- * uclass_find_device_by_seq() - Find uclass device based on ID and sequence
- *
- * This searches for a device with the given seq or req_seq.
- *
- * For seq, if an active device has this sequence it will be returned.
- * If there is no such device then this will return -ENODEV.
- *
- * For req_seq, if a device (whether activated or not) has this req_seq
- * value, that device will be returned. This is a strong indication that
- * the device will receive that sequence when activated.
- *
- * The device is NOT probed, it is merely returned.
- *
- * @id: ID to look up
- * @seq_or_req_seq: Sequence number to find (0=first)
- * @find_req_seq: true to find req_seq, false to find seq
- * @devp: Returns pointer to device (there is only one per for each seq)
- * @return 0 if OK, -ve on error
- */
-int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
-			      bool find_req_seq, struct udevice **devp);
-
 #endif