On Mon, Aug 16, 2021 at 06:07:14PM +0200, Arkadiusz Kubalewski wrote: > +/* > + * Structure used for passing data with SIOCSSYNCE and SIOCGSYNCE ioctls > + */ > +struct synce_ref_clk_cfg { > + __u8 pin_id; How can the user know what values of 'pin_id' are valid and useful? > + _Bool enable; > +}; Thanks, Richard