Hi Sudeep > Subject: Re: [PATCH v5 1/2] dt-bindings: mailbox: add binding doc for the ARM > SMC/HVC mailbox > > On Fri, Aug 30, 2019 at 07:37:41AM +0000, Peng Fan wrote: > > Hi Jassi, > > > > I think there could be channel for TEE, and channel for Linux. > > > > For virtualization case, there could be dedicated channel for each VM. > > > > > > > I am talking from Linux pov. Functions 0xfe and 0xff above, can't > > > both be active at the same time, right? > > > > If I get your point correctly, > > On UP, both could not be active. On SMP, tx/rx could be both active, > > anyway this depends on secure firmware and Linux firmware design. > > > > Just to confirm, we can't have SMC/HVC based Rx channel as there's no > *architectural* way to achieve it. So it can be based on some interrupt from > secure side and hence will be a *different* type of channel/controller. > > Sorry to make this point repeatedly, but juts to be absolutely clear: > as it stands, SMC/HVC can be used only for Tx today. Since interrupt notification was dropped in v5, I need to drop RX description in v6. Thanks, Peng. > > -- > Regards, > Sudeep
