linux-kernel - RE: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP firmware

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Message-ID: <DM2PR0201MB07678A47B5380DC14E6F6126B8D30@DM2PR0201MB0767.namprd02.prod.outlook.com>
Date:   Mon, 12 Mar 2018 23:07:56 +0000
From:   Jolly Shah <JOLLYS@...inx.com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "matt@...eblueprint.co.uk" <matt@...eblueprint.co.uk>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "michal.simek@...inx.com" <michal.simek@...inx.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        Rajan Vaja <RAJANV@...inx.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v5 1/4] dt-bindings: firmware: Add bindings for ZynqMP
 firmware

Hi Sudeep,

> -----Original Message-----
> From: Sudeep Holla [mailto:sudeep.holla@....com]
> Sent: Thursday, March 08, 2018 3:48 AM
> To: Jolly Shah <JOLLYS@...inx.com>
> Cc: gregkh@...uxfoundation.org; matt@...eblueprint.co.uk;
> hkallweit1@...il.com; michal.simek@...inx.com; robh+dt@...nel.org;
> mark.rutland@....com; Sudeep Holla <sudeep.holla@....com>;
> ard.biesheuvel@...aro.org; mingo@...nel.org; keescook@...omium.org;
> dmitry.torokhov@...il.com; Rajan Vaja <RAJANV@...inx.com>; linux-arm-
> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org;
> devicetree@...r.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