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SubjectRE: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP firmware
Date
Hi Sudeep,

> -----Original Message-----
> From: Sudeep Holla [mailto:sudeep.holla@arm.com]
> Sent: Thursday, March 08, 2018 3:48 AM
> To: Jolly Shah <JOLLYS@xilinx.com>
> Cc: gregkh@linuxfoundation.org; matt@codeblueprint.co.uk;
> hkallweit1@gmail.com; michal.simek@xilinx.com; robh+dt@kernel.org;
> mark.rutland@arm.com; Sudeep Holla <sudeep.holla@arm.com>;
> ard.biesheuvel@linaro.org; mingo@kernel.org; keescook@chromium.org;
> dmitry.torokhov@gmail.com; Rajan Vaja <RAJANV@xilinx.com>; linux-arm-
> kernel@lists.infradead.org; linux-kernel@vger.kernel.org;
> devicetree@vger.kernel.org
> Subject: Re: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP
> firmware
>
>
>
> On 07/03/18 22:25, Jolly Shah wrote:
> > Hi Sudeep,
> >
>
> [...]
>
> >>> +Examples:
> >>> + firmware {
> >>> + zynqmp_firmware: zynqmp-firmware {
> >>> + compatible = "xlnx,zynqmp-firmware";
> >>> + method = "smc";
> >>> + };
> >>> + };
> >>>
> >>
> >> 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.


> --
> Regards,
> Sudeep
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