linux-kernel - Re: [PATCH v1] mtd: spi-nor: Add support for Winbond w25q64jv spi flash

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Date:   Mon, 29 Jun 2020 19:01:51 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <thesven73@...il.com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] mtd: spi-nor: Add support for Winbond w25q64jv spi
 flash

On 6/29/20 5:53 PM, Sven Van Asbroeck wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Hi Tudor,
> 
> On Mon, Jun 29, 2020 at 8:50 AM <Tudor.Ambarus@...rochip.com> wrote:
>>
>> I'm reading the following datasheet:
>> https://www.winbond.com/resource-files/w25q64jv%20revj%2003272018%20plus.pdf
>>
>> w25q64jvm (0xef7017) comes with QE bit set to a 0 state, but can be
>> set to 1, so Quad mode can be supported. Would you please set SPI_NOR_DUAL_READ
>> and SPI_NOR_QUAD_READ flags and test and see if Quad works? If all good,
>> please specify in the commit message with which controller you did the tests.
>>
> 
> Good point !
> 
> Unfortunately I'm using the spi controller on an imx6 ("fsl,imx51-ecspi") which
> does not support dual or quad mode. So I cannot possibly test this :)
> 
> How would you like to proceed? Should I keep this as a private patch, and
> wait until someone comes along who can test this on more capable
> controller h/w ?
> 
> Or should I re-spin the patch without the flags?
> 

Re-spin the patch without the flags. We can add them later on, when someone can
test them.

Cheers,
ta