devfs-code: fix warning ...

/opt/work/barebox/fs/devfs-core.c: In function 'partition_ioctl':
/opt/work/barebox/fs/devfs-core.c27: warning: unused variable 'reg'

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ioctl: add support for ECCGETSTATS and MEMGETREGIONINFO ...

Support added for ioctl of ECCGETSTATS and MEMGETREGIONINFO.

Fix default handling in core.c to return -EINVAL, if request
was unknown.

Signed-off-by: Alexander Aring <a.aring@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

cdev: pass flags to open function ...

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

Create a unique cdev number for on demand devices ...

For disk like devices attached to MCI, ATA or USB it depends on the order they
will be recognized. So an unique number for all disk like devices is required.

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

devfs: factor out core devfs functionality ...

This makes it possible to compile without devfs. devfs_create/devfs_remove
is used by drivers and thus must still be present even without devfs support.
Also, this patch adds cdev_open/cdev_close/cdev_flush/cdev_ioctl calls to
work with devices without using the file api.

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