On Thu, 20 Aug 2020, Boris Brezillon wrote:

On Thu, 20 Aug 2020 10:08:29 +0200
Miquel Raynal [off-list ref] wrote:

quoted

quoted

+		/*
+		 * TODO: Extend the subsystem layer to allow for registering
+		 * new device and provide BCR/DCR/PID at the same time.  

Not sure this is needed if you don't use it directly as the core will
anyway (in its current form) send the relevant CCC to read these
registers.

We considered optimizing that in the past but that means making the DAA
and SETDASA registration different. I'm not sure it's worth it to be
honest, PID/DCR/BCR only happens when initializing devices and I
suspect the overhead of querying those DATA twice in case of DAA is
negligible anyway.

Wellllll... I know some people who do feel strongly about this 
particular issue for some reasons. So I'd prefer giving them some hope 
and leave the door open to some i3c_master_add_i3c_dev_and_info() 
interface. In the end, it's just a matter of pre-filling the info struct 
and skipping the PID retrieval in i3c_master_getpid_locked() if already 
available, etc.


Nicolas