linux-kernel - [PATCH 8/8] mtd: spinand: winbond: Add comment about the maximum frequency

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Message-Id: <20250618-winbond-6-16-rc1-octal-phy-upstream-v1-8-513202126013@bootlin.com>
Date: Wed, 18 Jun 2025 14:14:25 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Mark Brown <broonie@...nel.org>, Richard Weinberger <richard@....at>, 
 Vignesh Raghavendra <vigneshr@...com>
Cc: Yogesh S <yogeshs@...com>, Santhosh Kumar K <s-k6@...com>, 
 Steam Lin <STLin2@...bond.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, linux-spi@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org, 
 Miquel Raynal <miquel.raynal@...tlin.com>
Subject: [PATCH 8/8] mtd: spinand: winbond: Add comment about the maximum
 frequency

Clarify that Winbond octal capable chips may be clocked at up to 166MHz,
which is their absolute maximum.

No per-operation maximum value (captured with a "0" in the table)
involves that in these cases the maximum frequency of the chip applies,
ie. the one commonly described in the DT.

Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
---
 drivers/mtd/nand/spi/winbond.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mtd/nand/spi/winbond.c b/drivers/mtd/nand/spi/winbond.c
index 53890b1da65cd4b2a956edde48c591c043242399..87053389a1fc7abf6e6b12d061c74442ea3bbcaf 100644
--- a/drivers/mtd/nand/spi/winbond.c
+++ b/drivers/mtd/nand/spi/winbond.c
@@ -32,6 +32,7 @@
 /*
  * "X2" in the core is equivalent to "dual output" in the datasheets,
  * "X4" in the core is equivalent to "quad output" in the datasheets.
+ * Quad and octal capable chips feature an absolute maximum frequency of 166MHz.
  */
 
 static SPINAND_OP_VARIANTS(read_cache_octal_variants,

-- 
2.48.1