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

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Date:   Thu, 29 Apr 2021 23:54:08 +0200
From:   Michael Walle <michael@...le.cc>
To:     Alexander Williams <awill@...gle.com>
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

Am 2021-04-29 23:34, schrieb Alexander Williams:
> 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.

Good idea! Will change that in the next version.

-michael