[PATCH] mtd: spi-nor: support eon en25qh256a variant

[Leon M. George]

This patch allows accessing the uppoer 8m on the A variant (EN25QH256A) of
the EN25QH256 that shares same JEDEC ID.

Without this patch, addr_with is detected to be '4' but the read_opcode is
a plain READ (supporting only 3 byte addresses).
Setting PARSE_SFDP is enough to detect the read_opcode to READ_4B.
READ_4B is only supported on the A variant.

Both support 4-byte address mode (spi_nor_set_4byte_addr_mode) but that is
prone to breaking on unexpected reboots if the reset pin isn't connected
(broken-flash-reset).

The no-A variant supports a 'high bank latch mode' that affects read,
program, and erase commands - similar to the extended address register
(EAR).
The HBL bit is manipulated using the ENHBL (0x67) and EXHBL (0x98)
opcodes.

Should it become necessary to distinguish the two variants in the future,
the A variant sets the SNOR_HWCAPS_READ_1_1_4 SFDP param - the no-A
variant doesn't.

Tested with and without fast read on the A variant only.

Signed-off-by: Leon M. George <leon at georgemail.eu>
---
 drivers/mtd/spi-nor/eon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/eon.c b/drivers/mtd/spi-nor/eon.c
index 8c1c57530281..50a11053711f 100644
--- a/drivers/mtd/spi-nor/eon.c
+++ b/drivers/mtd/spi-nor/eon.c
@@ -25,7 +25,8 @@ static const struct flash_info eon_nor_parts[] = {
 	{ "en25qh64",   INFO(0x1c7017, 0, 64 * 1024,  128)
 		NO_SFDP_FLAGS(SECT_4K | SPI_NOR_DUAL_READ) },
 	{ "en25qh128",  INFO(0x1c7018, 0, 64 * 1024,  256) },
-	{ "en25qh256",  INFO(0x1c7019, 0, 64 * 1024,  512) },
+	{ "en25qh256",  INFO(0x1c7019, 0, 64 * 1024,  512)
+		PARSE_SFDP },
 	{ "en25s64",	INFO(0x1c3817, 0, 64 * 1024,  128)
 		NO_SFDP_FLAGS(SECT_4K) },
 };
-- 
2.35.1