[PATCH 2/6] of: add function to check against a list of compatible strings

[Heiko Stübner]

Am Dienstag, 15. Oktober 2013, 13:11:46 schrieb Mark Rutland:
> Hi Heiko,
> 
> On Tue, Oct 15, 2013 at 11:47:50AM +0100, Heiko Stübner wrote:
> > The basic of functions already provide a of_device_is_compatible to check
> > if a device's compatible property contains a specific one. But sometimes
> > it's also necessary to check if the device is compatible to one out of a
> > list of compatible devices.
> > 
> > Therefore add of_device_is_any_of that reuses the compatible check of
> > of_device_is_compatible but checks against a list of compatible strings
> > without the locking overhead of calling of_device_is_compatible multiple
> > times.
> 
> I don't think we need this -- we already have of_match_node, and you can
> use it to achieve the same result.

You are right of course, of_match_node does exactly what needed.


Thanks
Heiko


> > Signed-off-by: Heiko Stuebner <heiko at sntech.de>
> > ---
> > 
> >  drivers/of/base.c  |   21 +++++++++++++++++++++
> >  include/linux/of.h |    2 ++
> >  2 files changed, 23 insertions(+)
> > 
> > diff --git a/drivers/of/base.c b/drivers/of/base.c
> > index 865d3f6..589f43e 100644
> > --- a/drivers/of/base.c
> > +++ b/drivers/of/base.c
> > @@ -366,6 +366,27 @@ int of_device_is_compatible(const struct device_node
> > *device,
> > 
> >  EXPORT_SYMBOL(of_device_is_compatible);
> >  
> >  /**
> > 
> > + * Checks if any of the given "compat" strings matches one of the
> > strings + * in the device's "compatible" property.
> > + */
> > +int of_device_is_any_of(const struct device_node *device,
> > +			const char * const *compat, int num) {
> > +	unsigned long flags;
> > +	int res = 0, i;
> > +
> > +	raw_spin_lock_irqsave(&devtree_lock, flags);
> > +	for (i = 0; i < num; i++) {
> > +		if (__of_device_is_compatible(device, compat[i])) {
> > +			res = 1;
> > +			break;
> > +		}
> > +	}
> > +	raw_spin_unlock_irqrestore(&devtree_lock, flags);
> > +	return res;
> > +}
> > +EXPORT_SYMBOL(of_device_is_any_of);
> > +
> > +/**
> > 
> >   * of_machine_is_compatible - Test root of device tree for a given
> >   compatible value * @compat: compatible string to look for in root
> >   node's compatible property. *
> > 
> > diff --git a/include/linux/of.h b/include/linux/of.h
> > index f95aee3..5bf7c9a 100644
> > --- a/include/linux/of.h
> > +++ b/include/linux/of.h
> > @@ -262,6 +262,8 @@ extern int of_property_count_strings(struct
> > device_node *np,
> > 
> >  				     const char *propname);
> >  
> >  extern int of_device_is_compatible(const struct device_node *device,
> >  
> >  				   const char *);
> > 
> > +extern int of_device_is_any_of(const struct device_node *device,
> > +			       const char * const *compat, int num);
> > 
> >  extern int of_device_is_available(const struct device_node *device);
> >  extern const void *of_get_property(const struct device_node *node,
> >  
> >  				const char *name,