Re: [PATCH 11/30] mtd: spi-nor: winbond: W25Q32JV-Q/N: Fill locking information

From: Miquel Raynal <miquel.raynal@bootlin.com>
To: "Michael Walle" <mwalle@kernel.org>
Cc: "Pratyush Yadav" <pratyush@kernel.org>,
	 "Takahiro Kuwano" <takahiro.kuwano@infineon.com>,
	 "Richard Weinberger" <richard@nod.at>,
	"Vignesh Raghavendra" <vigneshr@ti.com>,
	 "Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
	 "Steam Lin" <STLin2@winbond.com>,
	<linux-mtd@lists.infradead.org>,  <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 11/30] mtd: spi-nor: winbond: W25Q32JV-Q/N: Fill locking information
Date: Wed, 22 Jul 2026 17:00:08 +0200	[thread overview]
Message-ID: <87ldb3hxxj.fsf@bootlin.com> (raw)
In-Reply-To: <DJRK05XL4ONU.MM3VQ61CQJ6I@kernel.org> (Michael Walle's message of "Mon, 06 Jul 2026 16:21:54 +0200")

> The original W25Q32 doesn't have the CMP bit.

I didn't found any datasheet without the CMP bit, but now that I know
these chips had a new batch (with mandatory SFDP support) starting from
2016, whereas the datasheets I looked at were from 2017, it is possible
that I couldn't find an old enough one.

Which brings me to a more important question: can we anyway enable CMP
anyway? I contributed several patches for that already (merged). I guess
if the CMP bit is not present, the old software does not use it. If it
tries to use it, normally the verification should fail.

Thanks,
Miquèl

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