On Thu, Dec 26, 2013 at 05:18:35AM +0000, Xiubo Li wrote: > Gets to know whether one optional property is present or not in one > device node. Returns true if the property is present, false otherwise. > > There is one similar helper of_property_read_bool(), but it means that > the property is one boolen type. For many drivers, they need to know > whether one optional property is present or not firstly. Though many > other of_XX helper can do this before deal with it's real work, there > maybe other errors the driver need to deal with, and the errors maybe > the same with the property absent error. And this helper can make the > code briefer,more readable and easier to deal with. > > Signed-off-by: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx> > --- > include/linux/of.h | 17 +++++++++++++++++ > 1 file changed, 17 insertions(+) > > diff --git a/include/linux/of.h b/include/linux/of.h > index 276c546..0bd8cb9 100644 > --- a/include/linux/of.h > +++ b/include/linux/of.h > @@ -601,6 +601,23 @@ static inline int of_property_read_u32(const struct device_node *np, > return of_property_read_u32_array(np, propname, out_value, 1); > } > > +/** > + * of_property_optional - Find one optional property If we really do need something like this, it would be better named of_property_present (and can alias of_property_read_bool internally). Is there a particular case this would make easier? Do you have a real example? Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
