linux-kernel - Re: [PATCH v11 07/10] mtd: spi-nor: Add stacked memories support in spi-nor

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Date: Fri, 15 Dec 2023 10:09:40 +0200
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: "Mahapatra, Amit Kumar" <amit.kumar-mahapatra@....com>,
 "broonie@...nel.org" <broonie@...nel.org>,
 "pratyush@...nel.org" <pratyush@...nel.org>,
 "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
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 "sbinding@...nsource.cirrus.com" <sbinding@...nsource.cirrus.com>,
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 "david.rhodes@...rus.com" <david.rhodes@...rus.com>,
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Cc: "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "michael@...le.cc" <michael@...le.cc>,
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 "Simek, Michal" <michal.simek@....com>,
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 <linux-arm-kernel@...ts.infradead.org>,
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 "git (AMD-Xilinx)" <git@....com>,
 "amitrkcian2002@...il.com" <amitrkcian2002@...il.com>
Subject: Re: [PATCH v11 07/10] mtd: spi-nor: Add stacked memories support in
 spi-nor



On 15.12.2023 09:55, Mahapatra, Amit Kumar wrote:
>> Thanks! Can you share with us what flashes you used for testing in the
>> stacked and parallel configurations?
> I used SPI-NOR QSPI flashes for testing stacked and parallel.

I got that, I wanted the flash name or device ID.

What I'm interested is if each flash is in its own package. Are they?

> 
>>>> can combine a SPI NOR with a SPI NAND in stacked configuration?
>>> No, Xilinx/AMD QSPI controllers doesn't support this configuration.
>>>
>> 2 SPI NANDs shall work with the AMD controller, right?
> We never tested 2 SPI-NAND with AMD controller.

I was asking because I think the stacked layer shall be SPI MEM generic,
and not particular to SPI NOR.

>> I skimmed over the QSPI controller datasheet and wondered why one would
>> get complicated with 2 Quad Flashes when we have Octal. But then I saw that
>> the same SoC can configure an Octal controller (the Octal and Quad
>> controllers seems mutual exclusive) and that the Octal one can operate 2
>> octal flashes in stacked mode 🙂.
> Thats correct .
> 
> Please let me know how you want me to proceed on this.

I got you. Still need to allocate more time on this.

Cheers,
ta