[PATCH] of: Add more stubs for non-OF builds

[Grant Likely]

On Thu, 20 Jun 2013 16:49:54 -0700, Bryan Wu <cooloney at gmail.com> 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)) {}".

So, no, I don't want this patch merged.

g.


> 
> Thanks,
> -Bryan
> 
> On Tue, Jun 18, 2013 at 9:35 AM, Alexander Shiyan <shc_work at mail.ru> wrote:
> >> Perhaps a more specific subject.
> >
> > I can just specify stub function names in the subject.
> > Is this enough?
> >
> >> On 06/17/2013 12:24 PM, Alexander Shiyan wrote:
> >> > Patch adds of_get_next_child and of_get_next_available_child
> >> > stubs for non-OF builds.
> >> >
> >> > Signed-off-by: Alexander Shiyan <shc_work at mail.ru>
> >> > ---
> >>
> >> What changed for v2?
> >
> > v1 not contain "inline" for prototypes.
> >
> >> >  include/linux/of.h | 16 ++++++++++++++--
> >> >  1 file changed, 14 insertions(+), 2 deletions(-)
> >> >
> >> > diff --git a/include/linux/of.h b/include/linux/of.h
> >> > index 1fd08ca..df0e644 100644
> >> > --- a/include/linux/of.h
> >> > +++ b/include/linux/of.h
> >> > @@ -366,8 +366,17 @@ static inline bool of_have_populated_dt(void)
> >> >     return false;
> >> >  }
> >> >
> >> > -#define for_each_child_of_node(parent, child) \
> >> > -   while (0)
> >> > +static struct device_node *of_get_next_child(const struct device_node *node,
> >> > +                                        struct device_node *prev)
> >> > +{
> >> > +   return NULL;
> >> > +}
> >> > +
> >> > +static struct device_node *of_get_next_available_child(
> >> > +   const struct device_node *node, struct device_node *prev)
> >> > +{
> >> > +   return NULL;
> >> > +}
> >> >
> >> >  static inline struct device_node *of_get_child_by_name(
> >> >                                     const struct device_node *node,
> >> > @@ -376,6 +385,9 @@ static inline struct device_node *of_get_child_by_name(
> >> >     return NULL;
> >> >  }
> >> >
> >> > +#define for_each_child_of_node(parent, child) \
> >>
> >> parent and child need unused annotations to avoid unused variable warnings.
> >
> > This define has been moved just for keep same order as for OF-version.
> >
> > ---

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