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

[Tudor Ambarus <tudor.ambarus@linaro.org>]

On 7/1/24 11:15 AM, Tudor Ambarus wrote:
> 
> 
> 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.
> 

And you can then decide which OTP org to use based on whether SFDP is
present or not.

> 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/