linux-kernel - [PATCH 01/28] spi: spi-mem: Make the DTR command operation macro more suitable

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Message-Id: <20251031-winbond-v6-17-rc1-oddr-v1-1-be42de23ebf1@bootlin.com>
Date: Fri, 31 Oct 2025 18:26:45 +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 01/28] spi: spi-mem: Make the DTR command operation macro
 more suitable

In order to introduce DTR support in SPI NAND, a number of macros had to
be created in the spi-mem layer. One of them remained unused at this
point, SPI_MEM_DTR_OP_CMD. Being in the process of introducing octal DTR
support now, experience shows that as-is the macro is not useful. In
order to be really useful in octal DTR mode, the command opcode (one
byte) must always be transmitted on the 8 data lines on both the rising
and falling edge of the clock. Align the macro with the real needs by
duplicating the opcode in the buffer and doubling its size.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 include/linux/spi/spi-mem.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h
index 82390712794c5a4dcef1319c19d74b77b6e1e724..81c9c7e793b6ab894675e0198d412d84b8525c2e 100644
--- a/include/linux/spi/spi-mem.h
+++ b/include/linux/spi/spi-mem.h
@@ -20,10 +20,10 @@
 		.opcode = __opcode,				\
 	}
 
-#define SPI_MEM_DTR_OP_CMD(__opcode, __buswidth)		\
+#define SPI_MEM_DTR_OP_RPT_CMD(__opcode, __buswidth)		\
 	{							\
-		.nbytes = 1,					\
-		.opcode = __opcode,				\
+		.nbytes = 2,					\
+		.opcode = __opcode | __opcode << 8,		\
 		.buswidth = __buswidth,				\
 		.dtr = true,					\
 	}

-- 
2.51.0