linux-kernel - [PATCH 2/4] mtd: spi-nor: micron-st: add die erase for mt35xu512aba

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Message-Id: <20251110-nor-v1-2-cde50c81db05@nxp.com>
Date: Mon, 10 Nov 2025 12:02:57 +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 2/4] mtd: spi-nor: micron-st: add die erase for
 mt35xu512aba

mt35xu512aba do not support chip erase command, and it contains one
die, and only support die erase.

Unfortunately the die erase opcode does not have a 4-byte opcode,
here forced to enter in the 4 byte address mode in order to benefit
of the die erase.

Link: https://datasheet.octopart.com/MT35XU02GCBA1G12-0AAT-Micron-datasheet-138896808.pdf
Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/mtd/spi-nor/micron-st.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
index 92eb14ca76c57f29ece1edb3fe652c56d1c2888f..89cd146095584ddebdd258a186f6398b420e5800 100644
--- a/drivers/mtd/spi-nor/micron-st.c
+++ b/drivers/mtd/spi-nor/micron-st.c
@@ -159,6 +159,22 @@ static int micron_st_nor_two_die_late_init(struct spi_nor *nor)
 	return spi_nor_set_4byte_addr_mode(nor, true);
 }
 
+static int micron_st_nor_one_die_late_init(struct spi_nor *nor)
+{
+	struct spi_nor_flash_parameter *params = nor->params;
+
+	params->die_erase_opcode = SPINOR_OP_MT_DIE_ERASE;
+	params->n_dice = 1;
+
+	/*
+	 * Unfortunately the die erase opcode does not have a 4-byte opcode
+	 * correspondent for these flashes. The SFDP 4BAIT table fails to
+	 * consider the die erase too. We're forced to enter in the 4 byte
+	 * address mode in order to benefit of the die erase.
+	 */
+	return spi_nor_set_4byte_addr_mode(nor, true);
+}
+
 static void mt35xu512aba_default_init(struct spi_nor *nor)
 {
 	nor->params->set_octal_dtr = micron_st_nor_set_octal_dtr;
@@ -189,6 +205,7 @@ static int mt35xu512aba_post_sfdp_fixup(struct spi_nor *nor)
 static const struct spi_nor_fixups mt35xu512aba_fixups = {
 	.default_init = mt35xu512aba_default_init,
 	.post_sfdp = mt35xu512aba_post_sfdp_fixup,
+	.late_init = micron_st_nor_one_die_late_init,
 };
 
 static const struct flash_info micron_nor_parts[] = {

-- 
2.34.1