ar71xx: ar934x_nfc: use devm_* functions

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38067 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: ar934x_nfc: return error code from some low-level functions

Change some flow-level unctions to return with an
error code in order to be able to report errors
to the core code.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38068 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: ar934x_nfc: add experimental support for hardware ECC

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38069 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: add ath79_nfc_set_ecc_mode helper

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38070 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: wndr4300: enable HW ECC mode for the NAND controller

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38071 3c298f89-4303-0410-b956-a3cf2f4a3e73