linux-kernel - Re: [PATCH 1/2] iio: core: Support removing extended name in attribute filename

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Date:   Thu, 10 Jun 2021 14:07:35 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <michael.hennerich@...log.com>,
        linux-iio <linux-iio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] iio: core: Support removing extended name in
 attribute filename

Hi Jonathan,

Le jeu., juin 10 2021 at 14:04:12 +0100, Jonathan Cameron 
<Jonathan.Cameron@...wei.com> a écrit :
> On Thu, 10 Jun 2021 15:58:51 +0300
> Andy Shevchenko <andy.shevchenko@...il.com> wrote:
> 
>>  On Thu, Jun 10, 2021 at 3:47 PM Paul Cercueil 
>> <paul@...pouillou.net> wrote:
>>  >
>>  > By default, when a channel has an extended name, it will appear 
>> in the
>>  > filename of channel attributes. E.g. if the extended name is 
>> "aux", the
>>  > filename of a "sample_rate" attribute will be something like:
>>  > in_voltage0_aux_sample_rate
>>  >
>>  > Add a mechanism to disable this feature. This will be used to add 
>> a
>>  > "extended_name" channel attribute.
>> 
>>  I'm afraid, NAK. Otherwise, please put an explanation that clearly
>>  shows that it will be no ABI breakage.
>>  I.o.w. users for the existing drivers and devices will always get
>>  those attributes at the same platform configuration(s).
>> 
> 
> What Andy said.  This was a bad design decision a long time back, but
> we are stuck with it.
> 
> We have the _label attribute today that is the preferred route 
> forwards
> for new drivers but we can't touch the old ones however annoying it 
> might
> be.

You're missing the point here. This patchset only adds a new channel 
attribute and doesn't change anything else.

The "label" is good to have, but that doesn't help me in any way. The 
problem here is parseability.

Cheers,
-Paul