mtd: spi-nor: micron-st: Enable die erase support for MT35XU02GCBA

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>
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
[pratyush@kernel.org: drop the whole comment instead of just the TODO line]
Signed-off-by: Pratyush Yadav (Google) <pratyush@kernel.org>

Author: Haoyu Lu

drivers/mtd/spi-nor/micron-st.c

@@ -195,7 +195,7 @@ 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,
 };
@@ -212,25 +212,16 @@ 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,
-		 * according to its datasheet. It supports die erase, which
-		 * means the current driver implementation will likely need to
-		 * be converted to use die erase. Furthermore, similar to the
-		 * 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",
 		.sector_size = SZ_128K,
 		.size = SZ_256M,
 		.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,
 	},
 };