linux-kernel - Re: [PATCH 3/4] dt-bindings: mtd: macronix,mx25l12833f: add SPI-NOR chip

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Message-Id: <D2BU69BDUOL0.63A7T034CORP@kernel.org>
Date: Fri, 28 Jun 2024 19:45:50 +0200
From: "Michael Walle" <mwalle@...nel.org>
To: "Erez" <erezgeva2@...il.com>
Cc: "Conor Dooley" <conor@...nel.org>, "Erez Geva" <erezgeva@...ime.org>,
 <linux-mtd@...ts.infradead.org>, "Tudor Ambarus"
 <tudor.ambarus@...aro.org>, "Pratyush Yadav" <pratyush@...nel.org>,
 <linux-kernel@...r.kernel.org>, "Miquel Raynal"
 <miquel.raynal@...tlin.com>, "Richard Weinberger" <richard@....at>,
 "Vignesh Raghavendra" <vigneshr@...com>, <devicetree@...r.kernel.org>, "Rob
 Herring" <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>,
 "Conor Dooley" <conor+dt@...nel.org>
Subject: Re: [PATCH 3/4] dt-bindings: mtd: macronix,mx25l12833f: add SPI-NOR
 chip

> What is the kernel policy regarding obsolete flash chips?
> Macronix annonce on end of life of mx25l12805d in 2010.

Which doesn't mean there are no boards using it. But EOL in 2010
might be a strong argument to remove it. But I don't see the need
for it, yet.

> > Also please have a look at
> > https://docs.kernel.org/driver-api/mtd/spi-nor.html
>
> The new mx25l12833f supports SFDP, the obsolete mx25l12805d does not.
> I did manage to read the SFDP, though I do not have a copy of it (I do
> not have the hardware any more).

So how would you test newer versions of this series?

> To my best knowledge SFDP table do not contain information on OTP,

That's true, but we need it to detect flashes during runtime in the
future. Imagine sometime later, there's a third flash with this
exact ID, then we need to have the SFDP to figure out if there are
any differences between yours and the new one.

-michael