Krzysztof Kozlowski wrote on Wed, Feb 28, 2024 at 08:16:03AM +0100:
> On 28/02/2024 06:12, Dominique Martinet wrote:
> > From: Syunya Ohshio <syunya.ohshio@xxxxxxxxxxxxxxxxx>
> >
> > When using dtb overlays it can be difficult to predict which iio device
> > will get assigned what index, and there is no easy way to create
> > symlinks for /sys nodes through udev so to simplify userspace code make
> > it possible to request fixed indices for iio devices in device tree.
>
> Please use subject prefixes matching the subsystem. You can get them for
> example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
> your patch is touching.
Sorry, I assumed that was already the case and didn't think of checking
that from what I was given, I'll fix the prefix to "iio: core: .." in v2
> Please run scripts/checkpatch.pl and fix reported warnings. Some
> warnings can be ignored, but the code here looks like it needs a fix.
> Feel free to get in touch if the warning is not clear.
Hm, I did check that and do not get any warning about the code itself:
$ git show --format=email | ./scripts/checkpatch.pl -q
WARNING: DT binding docs and includes should be a separate patch. See: Documentation/devicetree/bindings/submitting-patches.rst
total: 0 errors, 1 warnings, 61 lines checked
What are you thinking of?
Regarding the dt binding, I'm not actually changing a binding so I
didn't think of rechecking after adding the note, but I guess it still
ought to be separate; I'll split it in v2.
> > For platforms without device trees of_alias_get_id will just fail and
> > ida_alloc_range will behave as ida_alloc currently does.
> >
> > For platforms with device trees, they can not set an alias, for example
> > this would try to get 10 from the ida for the device corresponding to
> > adc2:
> > aliases {
> > iio10 = &adc2
> > };
>
> Sorry, that's why you have labels and compatibles.
I'm not sure I understand this comment -- would you rather this doesn't
use aliases but instead add a new label (e.g. `iio,index = <10>` or
whatever) to the iio node itself?
Setting up a fixed alias seems to be precisely what aliases are about
(e.g. setting rtc0 will make a specific node become /dev/rtc0, same with
ethernet0, gpio, i2c, mmc, serial...), I'm not sure I agree a new label
would be more appropriate here, but perhaps I'm missing some context?
Thanks,
--
Dominique
