linux-kernel - Re: [PATCH 1/2] dt-bindings: arm: arm,scmi: add smc/hvc transports

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Date:   Tue, 11 Feb 2020 12:02:53 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Peng Fan <peng.fan@....com>
Cc:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        dl-linux-imx <linux-imx@....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>,
        "andre.przywara@....com" <andre.przywara@....com>
Subject: Re: [PATCH 1/2] dt-bindings: arm: arm,scmi: add smc/hvc transports

On Mon, Feb 10, 2020 at 12:59:43AM +0000, Peng Fan wrote:
> > Subject: [PATCH 1/2] dt-bindings: arm: arm,scmi: add smc/hvc transports
> >
> > From: Peng Fan <peng.fan@....com>
> >
> > SCMI could use SMC/HVC as tranports, so add into devicetree binding doc.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  Documentation/devicetree/bindings/arm/arm,scmi.txt | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt
> > b/Documentation/devicetree/bindings/arm/arm,scmi.txt
> > index f493d69e6194..03cff8b55a93 100644
> > --- a/Documentation/devicetree/bindings/arm/arm,scmi.txt
> > +++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt
> > @@ -14,7 +14,7 @@ Required properties:
> >
> >  The scmi node with the following properties shall be under the /firmware/
> > node.
> >
> > -- compatible : shall be "arm,scmi"
> > +- compatible : shall be "arm,scmi" or "arm,scmi-smc"
>
> One question here, are you fine with compatible "arm,scmi-smc" or
> add a new property 'transport' such as:

Not required.

> transport = "mailbox"; for mailbox
> transport = "smc"; for smc and hvc.
>
Each transport will have it's own specific property like mailboxes for
mailbox, smc/hvc function IDs for SMC/HVC. That should be sufficient.

--
Regards,
Sudeep