[PATCH 1/2] mtd: spi-nor: sfdp: get the 1-1-8 and 1-8-8 page programs from 4BAIT

From: Nuno Sá

Date: Fri Sep 11 2026 - 11:39:10 EST

Commit af2792abd455 ("mtd: spi-nor: sfdp: get the 1-1-8 and 1-8-8
protocol from SFDP") taught the core to discover octal read support
from BFPT, but the 4-Byte Address Instruction Table parser was never
extended accordingly.

Parse the 1-1-8 and 1-8-8 page program bits of 4BAIT DWORD1 and set the
corresponding 4-byte opcodes, so that octal writes stay available once
the flash switches to the 4-byte address instruction set.

This is in preparation of adding support for the ISSI IS25WX01G, a
1 Gbit octal flash which is beyond the 3-byte address range and
advertises 4-byte 1-1-8 and 1-8-8 page program instructions.

Signed-off-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
---
drivers/mtd/spi-nor/sfdp.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c
index c21a6953db96..8e3989184435 100644
--- a/drivers/mtd/spi-nor/sfdp.c
+++ b/drivers/mtd/spi-nor/sfdp.c
@@ -1081,6 +1081,8 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
{ SNOR_HWCAPS_PP, BIT(6) },
{ SNOR_HWCAPS_PP_1_1_4, BIT(7) },
{ SNOR_HWCAPS_PP_1_4_4, BIT(8) },
+ { SNOR_HWCAPS_PP_1_1_8, BIT(23) },
+ { SNOR_HWCAPS_PP_1_8_8, BIT(24) },
};
static const struct sfdp_4bait erases[SNOR_ERASE_TYPE_MAX] = {
{ 0u /* not used */, BIT(9) },
@@ -1207,6 +1209,14 @@ static int spi_nor_parse_4bait(struct spi_nor *nor,
spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_4_4],
SPINOR_OP_PP_1_4_4_4B,
SNOR_PROTO_1_4_4);
+ if (pp_hwcaps & SNOR_HWCAPS_PP_1_1_8)
+ spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_1_8],
+ SPINOR_OP_PP_1_1_8_4B,
+ SNOR_PROTO_1_1_8);
+ if (pp_hwcaps & SNOR_HWCAPS_PP_1_8_8)
+ spi_nor_set_pp_settings(&params_pp[SNOR_CMD_PP_1_8_8],
+ SPINOR_OP_PP_1_8_8_4B,
+ SNOR_PROTO_1_8_8);

for (i = 0; i < SNOR_ERASE_TYPE_MAX; i++) {
if (erase_mask & BIT(i))

--
2.55.0