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mtd: spi-nor: Add SR 4bit block protection support
Currently we are supporting block protection only for flash chips with
3 block protection bits (BP0-2) in the SR register.
Enable block protection support for flashes with 4 block protection bits
(BP0-3).
Add a flash_info flag for flashes that describe 4 block protection bits.
Add another flash_info flag for flashes in which BP3 bit is not adjacent
to the BP0-2 bits.
Tested with a n25q512ax3 (BP0-3) and w25q128 (BP0-2).
Signed-off-by: Jungseung Lee <js07.lee@samsung.com>
Reviewed-by: Michael Walle <michael@walle.cc>
Tested-by: Michael Walle <michael@walle.cc>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>