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 10:33:00 +0000
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>,
 "richard@....at" <richard@....at>, "vigneshr@...com" <vigneshr@...com>,
 "sbinding@...nsource.cirrus.com" <sbinding@...nsource.cirrus.com>,
 "lee@...nel.org" <lee@...nel.org>,
 "james.schulman@...rus.com" <james.schulman@...rus.com>,
 "david.rhodes@...rus.com" <david.rhodes@...rus.com>,
 "rf@...nsource.cirrus.com" <rf@...nsource.cirrus.com>,
 "perex@...ex.cz" <perex@...ex.cz>, "tiwai@...e.com" <tiwai@...e.com>
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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 "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
 "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
 "claudiu.beznea@...on.dev" <claudiu.beznea@...on.dev>,
 "Simek, Michal" <michal.simek@....com>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
 "patches@...nsource.cirrus.com" <patches@...nsource.cirrus.com>,
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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 12/15/23 10:02, Mahapatra, Amit Kumar wrote:
> Hello Tudor,

Hi,

> 
>> -----Original Message-----
>> From: Tudor Ambarus <tudor.ambarus@...aro.org>
>> Sent: Friday, December 15, 2023 1:40 PM
>> To: Mahapatra, Amit Kumar <amit.kumar-mahapatra@....com>;
>> broonie@...nel.org; pratyush@...nel.org; miquel.raynal@...tlin.com;
>> richard@....at; vigneshr@...com; sbinding@...nsource.cirrus.com;
>> lee@...nel.org; james.schulman@...rus.com; david.rhodes@...rus.com;
>> rf@...nsource.cirrus.com; perex@...ex.cz; tiwai@...e.com
>> Cc: linux-spi@...r.kernel.org; linux-kernel@...r.kernel.org;
>> michael@...le.cc; linux-mtd@...ts.infradead.org;
>> nicolas.ferre@...rochip.com; alexandre.belloni@...tlin.com;
>> claudiu.beznea@...on.dev; Simek, Michal <michal.simek@....com>; linux-
>> arm-kernel@...ts.infradead.org; alsa-devel@...a-project.org;
>> patches@...nsource.cirrus.com; linux-sound@...r.kernel.org; git (AMD-
>> Xilinx) <git@....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.
> 
> N25Q00A, MX66U2G45G, IS25LP01G & W25H02JV are some of the QSPI flashes on 
> which we tested. Additionally, we conducted tests on over 30 different 
> QSPI flashes from four distinct vendors (Miron, Winbond, Macronix, and ISSI).
> 

Great.

>> What I'm interested is if each flash is in its own package. Are they?
> 
> I'm sorry, but I don't quite understand what you mean by "if each flash in 
> its own package."
> 

There are flashes that are stacked at the physical level. It's a single
flash with multiple dies, that are all under a single physical package.

As I understand, your stacked flash model is at logical level. You have
2 flashes each in its own package. 2 different entities. Is my
understanding correct?

Cheers,
ta