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dm: blk: Allow blk_create_device() to allocate the device number

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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>
This commit is contained in:
Simon Glass 2016-05-01 11:36:28 -06:00
parent 199a1201ab
commit 52138fd407
2 changed files with 43 additions and 1 deletions
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15
include/blk.h
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@ -270,7 +270,8 @@ int blk_next_device(struct udevice **devp);
* @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_prepare_device(struct udevice *dev);
*/
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>
/*