ARM: i.MX6: ocotp: remove useless code ...

cdev->name is initialized to a static string, so no need
to check if it's non NULL.

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

Merge branch 'for-next/imx'

arm: imx: iim/ocotp: fix link error when !CONFIG_NET ...

Don't try to attach mac to device if there is no net support selected.
Fixes:
undefined reference to `dev_add_param_mac' in both iim and ocotp drivers.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: i.MX: ocotp: Add i.MX6sx compatible entry ...

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

ARM: i.MX: ocotp: Fix MAC address provider for unaligned addresses ...

The current algorithm assumes the MAC address starts at a 4 byte
aligned address. Unfortunately this is not always the case. On the
i.MX6sx the MAC Address for the second FEC starts at offset 0x632.
The register space for the fuse map has holes, only the 16 byte
aligned words contain data. This means we have to skip the holes.

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

resource: Let dev_request_mem_region return an error pointer ...

For all users fix or add the error check.

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

imx6: ocotp: Add On-Chip OTP registers write support ...

FUSEs (OTP registers) can be written via /dev/imx-ocotp character device.

For example, writing MAC 12:34:56:78:9A:BC can be performed as
    > mw -l -d /dev/imx-ocotp 0x8c 0x00001234
    > mw -l -d /dev/imx-ocotp 0x88 0x56789ABC
and reading as
    > md -l -s /dev/imx-ocotp 0x88+8
    00000088: 56789ABC 00001234
, where 0x88 (0x22*4) and 0x8C (0x23*4) are offsets of MAC OTP registers.

Notice: FUSEs are PROM, so "0" (unprogrammed) bits
can be replaced with "1" (but not vice versa) only once.

Also, for MAC there are convinient parameters:
    > ocotp0.permanent_write_enable=1
    > ocotp0.mac_addr=12:34:56:78:9A:BC
    imx_ocotp 21bc000.ocotp: reloading shadow registers...
    imx_ocotp 21bc000.ocotp: reloading shadow registers...
    > echo $ocotp0.mac_addr
    12:34:56:78:9A:BC

Signed-off-by: Uladzimir Bely <u.bely@sam-solutions.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

treewide: Add missing includes ...

A lot of files rely on include/driver.h including include/of.h (and
this including include/errno.h. include the files explicitly so we can
eventually get rid of including of.h from driver.h

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

ARM: i.MX6: Add ocotp driver ...

The only functionality at the moment is to register a MAC Address for
an ethernet device.

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