Re: [PATCH v4] iio: Handle enumerated properties with gaps

[Alexandru Ardelean]

On Mon, Dec 21, 2020 at 8:02 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
>
> On Mon, Dec 21, 2020 at 5:11 PM Alexandru Ardelean
> <alexandru.ardelean@xxxxxxxxxx> wrote:
> >
> > From: Lars-Peter Clausen <lars@xxxxxxxxxx>
> >
> > Some enums might have gaps or reserved values in the middle of their value
> > range. E.g. consider a 2-bit enum where the values 0, 1 and 3 have a
> > meaning, but 2 is a reserved value and can not be used.
> >
> > Add support for such enums to the IIO enum helper functions. A reserved
> > values is marked by setting its entry in the items array to NULL rather
> > than the normal descriptive string value.
>
> ...
>
> > I tried a few shots at working with 'lib/string.c', and that went
> > slow. The __sysfs_match_string_with_gaps() approach has stalled.
> > https://lore.kernel.org/linux-iio/20190422140251.8960-1-alexandru.ardelean@xxxxxxxxxx/
>
> Hmm... If you are not going to push that forward, perhaps better is to  provide
> iio_sysfs_match_string() and if we need it in the future for other
> users, it would be easier to find and export. Also it will be a matter
> of one line change in the caller.

That can work as well.
Maybe add the __sysfs_match_string_with_gaps() here directly?

>
> --
> With Best Regards,
> Andy Shevchenko