linux-kernel - Re: [PATCH V1 1/1] linux: drivers: mtd: spi-nor: gigadevice.c

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Message-ID: <3795b6594981a236481f70f9172d140b@walle.cc>
Date:   Fri, 21 Jul 2023 09:41:36 +0200
From:   Michael Walle <michael@...le.cc>
To:     Tudor Ambarus <tudor.ambarus@...aro.org>
Cc:     Vlim <vlim@...adevice.com>, pratyush@...nel.org,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        akumarma@....com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, vikhyat.goyal@....com
Subject: Re: [PATCH V1 1/1] linux: drivers: mtd: spi-nor: gigadevice.c

>> 
>> { "gd25q128", INFO(0xc84018, 0, 64 * 1024, 256)
>>             FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> 
> The locking support is not part of the JEDEC SFDP standard, but vendors
> can define their own SFDP tables where they describe the locking
> support. So for now, if you want to enable locking you have to specify
> the locking flags, whatever they are. There are different flavors of
> block protection locking, with 3 or 4 block protection bits, their
> order, etc. You'll have to check the datasheet.

I've seen that gigadevice has their own proprietary SFDP table which
also indicates locking. I'd prefer to have a parser for these, esp.
because the patch is coming from the vendor itself :)

-michael