On Thu, Apr 26, 2018 at 9:08 AM, Michal Simek <michal.simek@xxxxxxxxxx> wrote: > The function travers the lookup table to check if the request alias > id is compatible with the device driver match structure. > This function will be used by serial drivers to check if requested alias > is allocated or free to use. > > Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx> > --- > > drivers/of/base.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/of.h | 2 ++ > 2 files changed, 51 insertions(+) > > diff --git a/drivers/of/base.c b/drivers/of/base.c > index 848f549164cd..382de01acc72 100644 > --- a/drivers/of/base.c > +++ b/drivers/of/base.c > @@ -1892,6 +1892,55 @@ int of_alias_get_id(struct device_node *np, const char *stem) > } > EXPORT_SYMBOL_GPL(of_alias_get_id); > > +/** > + * of_alias_check_id - Check alias id for the give compatibility > + * @matches: Array of of device match structures to search in > + * @stem: Alias stem of the given device_node > + * @id: Alias ID for checking > + * > + * The function travers the lookup table to check if the request alias id > + * is compatible with the device driver match structure > + * > + * Return true if ID is allocated, return false if not > + */ > +bool of_alias_check_id(const struct of_device_id *matches, const char *stem, > + int id) Wouldn't it be simpler to just return a bitmap of all allocated ids that match rather than trying to build that up 1 bit at a time? Rob -- 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
