linux-kernel - [PATCH v2 25/27] mtd: spinand: Warn if using SSDR-only vendor commands in a non SSDR mode

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Message-Id: <20260109-winbond-v6-17-rc1-oddr-v2-25-1fff6a2ddb80@bootlin.com>
Date: Fri, 09 Jan 2026 18:18:23 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Mark Brown <broonie@...nel.org>, Richard Weinberger <richard@....at>, 
 Vignesh Raghavendra <vigneshr@...com>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Pratyush Yadav <pratyush@...nel.org>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Steam Lin <STLin2@...bond.com>, Santhosh Kumar K <s-k6@...com>, 
 linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-mtd@...ts.infradead.org, Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH v2 25/27] mtd: spinand: Warn if using SSDR-only vendor
 commands in a non SSDR mode

Both Macronix and Winbond have chip specific operations which are SSDR
only. Trying to use them in an ODTR setup will fail and doing this is a
pure software bug. Warn explicitly in this case.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/mtd/nand/spi/macronix.c | 2 ++
 drivers/mtd/nand/spi/winbond.c  | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/mtd/nand/spi/macronix.c b/drivers/mtd/nand/spi/macronix.c
index 6b7cbcc6e287..84be5e0402b5 100644
--- a/drivers/mtd/nand/spi/macronix.c
+++ b/drivers/mtd/nand/spi/macronix.c
@@ -53,6 +53,8 @@ static SPINAND_OP_VARIANTS(macronix_ops,
 static struct spi_mem_op
 spinand_fill_macronix_read_eccsr_op(struct spinand_device *spinand, void *valptr)
 {
+	WARN_ON_ONCE(spinand->bus_iface != SSDR);
+
 	return (struct spi_mem_op)SPINAND_MACRONIX_READ_ECCSR_1S_0_1S(valptr);
 }
 
diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
index 419f4303a0dc..90e4ece00cf5 100644
--- a/drivers/mtd/nand/spi/winbond.c
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -114,6 +114,8 @@ static SPINAND_OP_VARIANTS(winbond_w25_ops,
 static struct spi_mem_op
 spinand_fill_winbond_select_target_op(struct spinand_device *spinand, void *valptr)
 {
+	WARN_ON_ONCE(spinand->bus_iface != SSDR);
+
 	return (struct spi_mem_op)SPINAND_WINBOND_SELECT_TARGET_1S_0_1S(valptr);
 }
 

-- 
2.51.1