linux-kernel - Re: [PATCH v2 3/4] dt-bindings: mtd: macronix,mx25l12833f: add SPI-NOR chip

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Message-ID: <1d56c3b2-7adf-45b9-a509-956340f3f17b@linaro.org>
Date: Mon, 1 Jul 2024 11:15:50 +0100
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: Erez <erezgeva2@...il.com>, Esben Haabendal <esben@...nix.com>
Cc: Erez Geva <erezgeva@...ime.org>, linux-mtd@...ts.infradead.org,
 Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...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 v2 3/4] dt-bindings: mtd: macronix,mx25l12833f: add
 SPI-NOR chip



On 7/1/24 10:46 AM, Erez wrote:
> When using mx25l12805d, we do not read SFDP.
> As it uses the no-SFDP flags.
> When using mx25l12833f hardware with mx25l12805d driver, it did not
> try to read the SFDP.
> Yet mx25l12833f does have SFDP, when I remove the no-SFDP flags, the
> driver fetch the SFDP.
> 
> Secondly SFDP does not contain OTP information.
> 
> mx25l12805d has two OTP regions of 128 KiB and 384 KiB (yes asymmetric).
> While mx25l12833f has two OTP regions of 512 KiB.
> 
> How do we handle it?

You would first try to parse SFDP and initialize the flash based on
SFDP. If there's no SFDP then you fallback to the flags declared at
flash declaration. Esben had a try recently, see [1]. I don't know if
there's any progress in that direction.

Also, you haven't mentioned anything about the testing. Do you have the
flash?

[1]
https://lore.kernel.org/linux-mtd/20240603-macronix-mx25l3205d-fixups-v2-0-ff98da26835c@geanix.com/