linux-kernel - Re: [PATCH v3 2/2] mtd: spi-nor: add initial sysfs support

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Date:   Thu, 29 Apr 2021 14:34:10 -0700
From:   Alexander Williams <awill@...gle.com>
To:     Michael Walle <michael@...le.cc>
Cc:     linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <p.yadav@...com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Heiko Thiery <heiko.thiery@...il.com>
Subject: Re: [PATCH v3 2/2] mtd: spi-nor: add initial sysfs support

On Thu, Apr 29, 2021 at 8:57 AM Michael Walle <michael@...le.cc> wrote:
>
> Add support to show the manufacturer, the partname and JEDEC identifier
> as well as to dump the SFDP table. Not all flashes list their SFDP table
> contents in their datasheet. So having that is useful. It might also be
> helpful in bug reports from users.
>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> Pratyush, Heiko, I've dropped your Acked and Tested-by because there
> were some changes.
>
>  .../ABI/testing/sysfs-bus-spi-devices-spi-nor | 31 +++++++
>  drivers/mtd/spi-nor/Makefile                  |  2 +-
>  drivers/mtd/spi-nor/core.c                    |  1 +
>  drivers/mtd/spi-nor/core.h                    |  2 +
>  drivers/mtd/spi-nor/sysfs.c                   | 92 +++++++++++++++++++
>  5 files changed, 127 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor
>  create mode 100644 drivers/mtd/spi-nor/sysfs.c
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor b/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor
> new file mode 100644
> index 000000000000..4c88307759e2
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-spi-devices-spi-nor
> @@ -0,0 +1,31 @@
> +What:          /sys/bus/spi/devices/.../jedec_id

Since mtd/spi-nor doesn't own this device (belongs to the spi subsystem), should
we put its attributes under a named subdirectory? Perhaps something like
/sys/bus/spi/devices/.../spi_nor/jedec_id ?

I'm just thinking about avoiding any potential for namespace clashes.
- Alex