[QUESTION] How to support partial networking

[Francesco Valla <francesco@valla.it>]

Hello linux-can,

I am starting to develop a driver for the TJA1465 SIC CAN transceiver
from NXP [0], which among other things supports partial networking, and
I was wondering whether it has already been discussed or not how to
support such a feature.

For those not familiar, partial networking is an automotive-oriented
feature that allows to wake-up selectively through CAN traffic some ECUs
while leaving others in a quiescent state. This can be used for example
for periodic maintenance tasks, diagnostics or updates. It is typically
implemented inside a trasceiver, which is always powered and stores in
a volatile memory a list of CAN IDs (plus masks, much like the SocketCAN
filtering works) that shall lead to the wake-up of the ECU.

In the context of the Linux kernel, this can be probably be implemented
in a number of ways:

 - as a device-specifc capability (accessible e.g. through sysfs)
 - at phy level
 - in the generic CAN subsystem
 - ?

I did not find a previous discussion neither in the mailing list nor in
public presentations, but maybe some discussion already took place
privately or I missed something.

Any idea or preference? If not, I'll try to come up with a proposal and
submit an RFC.

[0] https://www.nxp.com/products/TJA1465

Thank you in advance!

Regards,
Francesco