[PATCH v3] mtd: spi-nor: micron-st: Enable die erase support for MT35XU02GCBA

Haoyu Lu
2026-03-31T09:54:17Z

The MT35XU02GCBA flash device does not support chip erase according
to its datasheet, but supports die erase. The existing code had a TODO
comment noting that the SPI_NOR_IO_MODE_EN_VOLATILE flag probably needs
to be enabled and the driver implementation needs to be converted to
use die erase.

This patch enables the SPI_NOR_IO_MODE_EN_VOLATILE flag and adds the
mt35_two_die_fixups to the MT35XU02GCBA entry, which includes the
micron_st_nor_two_die_late_init() function that sets up die erase
support.

With these changes, the flash device can properly use die erase
operations instead of chip erase.

Signed-off-by: Haoyu Lu <hechushiguitu666@gmail.com>
---
v3: Squash v1 and v2 into a single patch based on spi-nor/next as requested
v2: Remove TODO comment and rename mt35xu01gbba_fixups to mt35_two_die_fixups per review.

drivers/mtd/spi-nor/micron-st.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
index 88033384a71e..c22d62545391 100644
--- a/drivers/mtd/spi-nor/micron-st.c
+++ b/drivers/mtd/spi-nor/micron-st.c
@@ -188,7 +188,7 @@ static const struct spi_nor_fixups mt35xu512aba_fixups = {
.post_sfdp = mt35xu512aba_post_sfdp_fixup,
};

-static const struct spi_nor_fixups mt35xu01gbba_fixups = {
+static const struct spi_nor_fixups mt35_two_die_fixups = {
.post_sfdp = mt35xu512aba_post_sfdp_fixup,
.late_init = micron_st_nor_two_die_late_init,
};
@@ -205,7 +205,7 @@ static const struct flash_info micron_nor_parts[] = {
.id = SNOR_ID(0x2c, 0x5b, 0x1b),
.mfr_flags = USE_FSR,
.fixup_flags = SPI_NOR_IO_MODE_EN_VOLATILE,
- .fixups = &mt35xu01gbba_fixups,
+ .fixups = &mt35_two_die_fixups,
}, {
/*
* The MT35XU02GCBA flash device does not support chip erase,
@@ -215,7 +215,6 @@ static const struct flash_info micron_nor_parts[] = {
* MT35XU01GBBA, the SPI_NOR_IO_MODE_EN_VOLATILE flag probably
* needs to be enabled.
*
- * TODO: Fix these and test on real hardware.
*/
.id = SNOR_ID(0x2c, 0x5b, 0x1c),
.name = "mt35xu02g",
@@ -223,7 +223,8 @@ static const struct flash_info micron_nor_parts[] = {
.no_sfdp_flags = SECT_4K | SPI_NOR_OCTAL_READ,
.mfr_flags = USE_FSR,
- .fixup_flags = SPI_NOR_4B_OPCODES,
+ .fixup_flags = SPI_NOR_4B_OPCODES | SPI_NOR_IO_MODE_EN_VOLATILE,
+ .fixups = &mt35_two_die_fixups,
},
};

--
2.53.0.windows.1