On 12/03/18 23:07, Jolly Shah wrote:

Hi Sudeep,

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Do you foresee using SMC/HVC for this firmware even on future platforms?
If not, I suggest to keep the protocol part separate from the transport i.e.
smc/hvc via ATF. It could be replaced with mailbox or some h/w
mechanism in future ?

We have PSCI and EEMI interfaces exposed to linux from ATF. PSCI is an
EEMI client. We do not have current plans to switch to mailbox as it
will require 2 communication channels to PMU as PSCI is through ATF.

OK, but I just saw some bindings that has mailbox interface, honestly it's getting
too confusing with multiple series on the same thing floating and hence I
requested to put it together as one series.

Mailbox binding is used for power management driver. Mailbox is only
used for PMU->APU communication. APU->PMU communication is always
through EEMI firmware interface which is using SMC/HVC.

Ah OK, is it because there's no non-secure mailbox or to avoid races,
all non-secure EEMI is channeled through SMC ?

-- 
Regards,
Sudeep