> >> On Fri, Jun 21, 2013 at 7:17 AM, Alexander Shiyan <shc_work@xxxxxxx> wrote:
> >> >> On Thu, Jun 20, 2013 at 5:26 PM, Grant Likely <grant.likely@xxxxxxxxxx> wrote:
> >> >> > On Thu, 20 Jun 2013 16:49:54 -0700, Bryan Wu <cooloney@xxxxxxxxx> wrote:
> >> >> >> Hi Rob,
> >> >> >>
> >> >> >> Is this patch good for merging?
> >> >> >>
> >> >> >> In Alex's one patch to add device tree supporting for a leds driver,
> >> >> >> we got building errors due to miss definitions of some of_xxx api
> >> >> >> functions.
> >> >> >>
> >> >> >> It looks obviously to me that we need to fix this in device tree core
> >> >> >> instead put #ifdef CONFIG_OF everywhere.
> >> >> >
> >> >> > Actually, the reason those things aren't universally defined is to catch
> >> >> > exactly what it caught. The "leds-mc13783: Add devicetree support" patch
> >> >> > interleaves DT and non-DT parsing which isn't generally a good idea. The
> >> >> > DT parsing code should be shuffled off into a separate function and/or
> >> >> > contained with "if (IS_ENABLED(CONFIG_OF)) {}".
> >> >> >
> >> >>
> >> >> Agree, reasonable! I will remove this patch from my tree firstly.
> >> >>
> >> >> Alex, could you please update your patch with Grant's feedback?
> >> >
> >> > As far I understand you mean only the last part of patch. Where DT support
> >> > is introduced. Is not it?
> >> >
> >>
> >> Yes, exactly. I still keep those 2 non-DT related patches in my tree
> >> and just removed that DT supporting patch.
> >>
> >> Please update that patch and posted again to linux-leds and DT
> >> maintainers as well.
> >
> > I am really dont like any #ifdef in the source, but will do if this is only
> > one way to put this patch into the main tree.
>
> You don't need any #ifdefs. Put all the DT-related calls into a
> separate function specifically for decoding the DT information and
> wrap the contents with:
>
> if (IS_ENABLED(CONFIG_OF)) { }
This macro does not help for undefined reference, unfortunately.
So #ifdef and/or stubs for OF-functions is needed in this case anymore.
if (IS_ENABLED(CONFIG_OF))
some = of_get_next_child(foo, bar);
will produce an error at compile time if OF is not enabled,
because we have not empty function (if !OF) for this.
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