[PATCH v2 23/27] mtd: spi-nor: winbond: Add W25H01NWxxAM CMP locking support

[Miquel Raynal]

This chip has support for the locking complement (CMP) feature. Add
the relevant bit to enable it.

Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
---
Test run with W25H01NWxxAM:
$ flash_lock -u /dev/mtd0
$ flash_lock -l /dev/mtd0 $bs $all_but_one # all but the first
$ show_sectors
locked sectors
 region (in hex)   | status   | #blocks
 ------------------+----------+--------
 00000000-0000ffff | unlocked | 1
 00010000-07ffffff |   locked | 2047
$ flash_lock -u /dev/mtd0 $bs 1 # all but the two first
$ show_sectors
locked sectors
 region (in hex)   | status   | #blocks
 ------------------+----------+--------
 00000000-0001ffff | unlocked | 2
 00020000-07ffffff |   locked | 2046
$ flash_lock -u /dev/mtd0
$ flash_lock -l /dev/mtd0 0 $all_but_one # same from the other side
$ show_sectors
locked sectors
 region (in hex)   | status   | #blocks
 ------------------+----------+--------
 00000000-07feffff |   locked | 2047
 07ff0000-07ffffff | unlocked | 1
$ flash_lock -u /dev/mtd0 $(($size - (2 * $bs))) 1 # all but two
$ show_sectors
locked sectors
 region (in hex)   | status   | #blocks
 ------------------+----------+--------
 00000000-07fdffff |   locked | 2046
 07fe0000-07ffffff | unlocked | 2
---
 drivers/mtd/spi-nor/winbond.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
index 7609dcc768f0..1b9b0e9598ef 100644
--- a/drivers/mtd/spi-nor/winbond.c
+++ b/drivers/mtd/spi-nor/winbond.c
@@ -363,7 +363,8 @@ static const struct flash_info winbond_nor_parts[] = {
 	}, {
 		/* W25H01NWxxAM */
 		.id = SNOR_ID(0xef, 0xa0, 0x21),
-		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_TB_SR_BIT6 | SPI_NOR_4BIT_BP,
+		.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_TB_SR_BIT6 |
+			 SPI_NOR_4BIT_BP | SPI_NOR_HAS_CMP,
 	}, {
 		/* W25H02NWxxAM */
 		.id = SNOR_ID(0xef, 0xa0, 0x22),

-- 
2.51.1