dm: blk: Allow blk_create_device() to allocate the device number
Allow a devnum parameter of -1 to indicate that the device number should be
alocated automatically. The next highest available device number for that
interface type is used.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/blk.h b/include/blk.h
index 2caac9c..547c3b4 100644
--- a/include/blk.h
+++ b/include/blk.h
@@ -270,7 +270,8 @@
* @drv_name: Driver name to use for the block device
* @name: Name for the device
* @if_type: Interface type (enum if_type_t)
- * @devnum: Device number, specific to the interface type
+ * @devnum: Device number, specific to the interface type, or -1 to
+ * allocate the next available number
* @blksz: Block size of the device in bytes (typically 512)
* @size: Total size of the device in bytes
* @devp: the new device (which has not been probed)
@@ -299,6 +300,18 @@
*/
int blk_unbind_all(int if_type);
+/**
+ * blk_find_max_devnum() - find the maximum device number for an interface type
+ *
+ * Finds the last allocated device number for an interface type @if_type. The
+ * next number is safe to use for a newly allocated device.
+ *
+ * @if_type: Interface type to scan
+ * @return maximum device number found, or -ENODEV if none, or other -ve on
+ * error
+ */
+int blk_find_max_devnum(enum if_type if_type);
+
#else
#include <errno.h>
/*