On Wed, Oct 09, 2024 at 10:48:23AM +0200, Rodolfo Giometti wrote: > On 08/10/24 17:43, Greg KH wrote: > > On Tue, Oct 08, 2024 at 03:50:33PM +0200, Rodolfo Giometti wrote: > > > This patch adds the documentation for the ABI between the Linux kernel > > > and userspace regarding the PPS generators. > > > > > > Signed-off-by: Rodolfo Giometti <giometti@xxxxxxxxxxxx> > > > --- > > > Documentation/ABI/testing/sysfs-pps-gen | 44 +++++++++++++++++++++++++ > > > 1 file changed, 44 insertions(+) > > > create mode 100644 Documentation/ABI/testing/sysfs-pps-gen > > > > > > diff --git a/Documentation/ABI/testing/sysfs-pps-gen b/Documentation/ABI/testing/sysfs-pps-gen > > > new file mode 100644 > > > index 000000000000..9ad066cb3ce5 > > > --- /dev/null > > > +++ b/Documentation/ABI/testing/sysfs-pps-gen > > > @@ -0,0 +1,44 @@ > > > +What: /sys/class/pps-gen/ > > > +Date: October 2024 > > > +Contact: Rodolfo Giometti <giometti@xxxxxxxxxxxx> > > > +Description: > > > + The /sys/class/pps-gen/ directory will contain files and > > > + directories that will provide a unified interface to > > > + the PPS generators. > > > + > > > +What: /sys/class/pps-gen/pps-genX/ > > > +Date: October 2024 > > > +Contact: Rodolfo Giometti <giometti@xxxxxxxxxxxx> > > > +Description: > > > + The /sys/class/pps-gen/pps-genX/ directory is related to X-th > > > + PPS generator into the system. Each directory will > > > + contain files to manage and control its PPS generator. > > > + > > > +What: /sys/class/pps-gen/pps-genX/enable > > > +Date: October 2024 > > > +Contact: Rodolfo Giometti <giometti@xxxxxxxxxxxx> > > > +Description: > > > + This write-only file enables or disables generation of the > > > + PPS signal. > > > + > > > +What: /sys/class/pps-gen/pps-genX/name > > > +Date: October 2024 > > > +Contact: Rodolfo Giometti <giometti@xxxxxxxxxxxx> > > > +Description: > > > + This read-only file reports the name of the X-th generator. > > > > Again, why a name? What is that for? > > This can be useful in order to distinguish between different PPS generators > in the system. > > For example, the PARPORT generator is not very precise, and userspace > applications should be able to know which generator corresponds to the > device /dev/pps-gen0 or /dev/pps-gen1, etc. That's what the device symlink in the directory is for, no need to pick yet-another-random-name to have to read from a file :) thanks, greg k-h
