cdev: Add function to find cdev by device_node

This adds a device_node member to struct cdev and a function
to find a cdev by device_node.
This also removes the setting of cdev->dev->device_node in
the of partition parser. We must not set the device since it
may not refer to a partition but to a whole device with partitions.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/fs/devfs-core.c b/fs/devfs-core.c
index f45f8cadf1..62571fb8a3 100644
--- a/fs/devfs-core.c
+++ b/fs/devfs-core.c
@@ -57,6 +57,19 @@ struct cdev *cdev_by_name(const char *filename)
 	return NULL;
 }
 
+struct cdev *cdev_by_device_node(struct device_node *node)
+{
+	struct cdev *cdev;
+
+	list_for_each_entry(cdev, &cdev_list, list) {
+		if (!cdev->device_node)
+			continue;
+		if (cdev->device_node == node)
+			return cdev;
+	}
+	return NULL;
+}
+
 /**
  * device_find_partition - find a partition belonging to a physical device
  *