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:

quoted

Hi Jassi,

quoted

quoted

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

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel