On Wed, Feb 26, 2020 at 03:12:51PM +0800, peng.fan@xxxxxxx wrote: > From: Peng Fan <peng.fan@xxxxxxx> > > Take arm,smc-id as the 1st arg, and protocol id as the 2nd arg when > issuing SMC/HVC. Since we need protocol id, so add this parameter And why do we need protocol id here ? I couldn't find it out myself. I would like to know why/what/how is it used in the firmware(smc/hvc handler). I hope you are not mixing the need for multiple channel with protocol id ? One can find out id from the command itself, no need to pass it and hence asking here for more details. -- Regards, Sudeep