linux-kernel - Re: [PATCH] mtd: spi-nor: Add Winbond w25q16jv support

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Date:   Thu, 21 Feb 2019 21:58:47 +0100
From:   Robert Marko <robimarko@...il.com>
To:     Tudor.Ambarus@...rochip.com
Cc:     Marek Vašut <marek.vasut@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        bbrezillon@...nel.org, richard@....at,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: Add Winbond w25q16jv support

On Wed, 20 Feb 2019 at 21:29, <Tudor.Ambarus@...rochip.com> wrote:>>
Hi, Robert,>> On 02/14/2019 10:57 PM, Robert Marko wrote:> >
Datasheet: https://www.winbond.com/resource-files/w25q16jv%20spi%20revg%2003222018%20plus.pdf>
>> > Testing done on Mikrotik Routerboard RB450Gx4 board under 4.19.19
kernel.>> It is preferable to do the test on spi-nor/nextUnfortunately
I cant do that as OpenWrt has a considerable amount of patches that
would need to be ported and we are only moving from LTS to LTS version
and we are currently on 4.19.
> >
> > Test board does not support Dual or Quad modes.
> >
> > Signed-off-by: Robert Marko <robimarko@...il.com>
> > ---
> >  drivers/mtd/spi-nor/spi-nor.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> > index 6e13bbd1aaa5..0e958f48db1b 100644
> > --- a/drivers/mtd/spi-nor/spi-nor.c
> > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > @@ -1975,6 +1975,11 @@ static const struct flash_info spi_nor_ids[] = {
> >                       SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> >                       SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
> >       },
> > +     {
> > +             "w25q16jv", INFO(0xef7015, 0, 64 * 1024,  32,
> > +                     SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> > +                     SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB)
>
> You'll need a way to differentiate between W25Q16JV-IQ/JQ and W25Q16JV-IM/JM.
Hm, from what I understood JV is the series and suffix only indictes
the package.
They should all have the same JEDEC ID and features.
>
> And I would prefer to have the new entries ordered alphabetically as much as
> possible. This one should fit just before w25q20cl. Manufacturers are naming
> flashes based on a product identification system. The flashes are presented in
> alphabetical order, we should do the same.
I agree, will reorder and send a v2.
>
> Cheers,
> ta