linux-kernel - [PATCH v4 5/5] mtd: spi-nor: micron-st: add comment for mt35xu02gcba

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Message-Id: <20251112-nor-v4-5-e4637be82a0a@nxp.com>
Date: Wed, 12 Nov 2025 19:05:13 +0800
From: Haibo Chen <haibo.chen@....com>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...nel.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Haibo Chen <haibo.chen@....com>, imx@...ts.linux.dev
Subject: [PATCH v4 5/5] mtd: spi-nor: micron-st: add comment for
 mt35xu02gcba

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.

Link: https://datasheet.octopart.com/MT35XU02GCBA1G12-0AAT-Micron-datasheet-138896808.pdf
Reviewed-by: Tudor Ambarus <tudor.ambarus@...aro.org>
Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/mtd/spi-nor/micron-st.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
index c89c06b1fc61a581fea2e18732be2501a15715f9..f94e9d2d17bf4aa7c36ba3aa37d34f767a9f93ac 100644
--- a/drivers/mtd/spi-nor/micron-st.c
+++ b/drivers/mtd/spi-nor/micron-st.c
@@ -204,6 +204,16 @@ static const struct flash_info micron_nor_parts[] = {
 		.fixup_flags = SPI_NOR_IO_MODE_EN_VOLATILE,
 		.fixups = &mt35xu01gbba_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.
+		 */
 		.id = SNOR_ID(0x2c, 0x5b, 0x1c),
 		.name = "mt35xu02g",
 		.sector_size = SZ_128K,

-- 
2.34.1