linux-kernel - Re: [PATCH V2] mtd: spi-nor: winbond: Add support for winbond chip

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Message-ID: <CAD=FV=VB6hsEHEb8yZmB=xA__47p4vC6dBc528RV37dvAKTgOQ@mail.gmail.com>
Date:   Mon, 13 Dec 2021 07:52:24 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
Cc:     tudor.ambarus@...rochip.com, michael@...le.cc, p.yadav@...com,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stummala@...eaurora.org, vbadigan@...eaurora.org,
        quic_rampraka@...cinc.com, quic_pragalla@...cinc.com,
        sartgarg@...eaurora.org
Subject: Re: [PATCH V2] mtd: spi-nor: winbond: Add support for winbond chip

Hi,

On Wed, Dec 1, 2021 at 10:38 PM Shaik Sajida Bhanu
<quic_c_sbhanu@...cinc.com> wrote:
>
> Add support for winbond W25Q512NW-IM chip.
>
> Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>
> ---
> Changes since V1:
>         Added space before name of the flash part as suggested by Doug.

When someone comments on V1, it's nice to CC them on V2. ;-)

> ---
>  drivers/mtd/spi-nor/winbond.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
> index 96573f6..44f19f2 100644
> --- a/drivers/mtd/spi-nor/winbond.c
> +++ b/drivers/mtd/spi-nor/winbond.c
> @@ -100,6 +100,9 @@ static const struct flash_info winbond_parts[] = {
>                              SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
>         { "w25m512jv", INFO(0xef7119, 0, 64 * 1024, 1024,
>                             SECT_4K | SPI_NOR_QUAD_READ | SPI_NOR_DUAL_READ) },
> +       { "w25q512nw", INFO(0xef8020, 0, 64 * 1024, 1024,
> +                          SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
> +                          SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) },

I had a quick look. Though I'm no expert on this driver, I believe
that the name should be "w25q512nwm", not "w25q512nw" (you need an "m"
at the end). Evidence:

The Winbond doc [1] shows:

W25Q512NW-IM is 0xef8020
W25Q512NW-IQ/IN is 0xef6020

Comparing to a different datasheet [2], I see that:

W25Q256JW-IM is 0xef8019
W25Q256JW is 0xef6019

Since "W25Q256JW-IM" is in code as "w25q256jwm" it implies to me that
for the "-IM" suffix you just add a "m" to the end of the name.

[1] https://www.winbond.com/resource-files/W25Q512NW%20RevB%2007192021.pdf
[2] https://www.winbond.com/resource-files/W25Q256JW%20SPI%20RevJ%2003102021%20Plus.pdf

After changing the name, feel free to add my Reviewed-by (and please
CC me on v3).

-Doug