linux-kernel - RE: [PATCH V6 1/2] dt-bindings: mailbox: add binding doc for the ARM SMC/HVC mailbox

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Message-ID: <AM0PR04MB4481DB4590FF3DB941C88BBC888E0@AM0PR04MB4481.eurprd04.prod.outlook.com>
Date:   Wed, 18 Sep 2019 13:51:47 +0000
From:   Peng Fan <peng.fan@....com>
To:     Jassi Brar <jassisinghbrar@...il.com>
CC:     Andre Przywara <andre.przywara@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V6 1/2] dt-bindings: mailbox: add binding doc for the ARM
 SMC/HVC mailbox

> Subject: Re: [PATCH V6 1/2] dt-bindings: mailbox: add binding doc for the
> ARM SMC/HVC mailbox
> 
> On Wed, Sep 18, 2019 at 3:53 AM Peng Fan <peng.fan@....com> wrote:
> 
> > > >
> > > > > +
> > > > > +  "#mbox-cells":
> > > > > +    const: 1
> > > >
> > > > Why is this "1"? What is this number used for? It used to be the
> > > > channel ID,
> > > but since you are describing a single channel controller only, this
> > > should be 0 now.
> > > >
> > > Yes. I overlooked it and actually queued the patch for pull request.
> >
> > In Documentation/devicetree/bindings/mailbox/mailbox.txt
> > #mbox-cells: Must be at least 1.
> >
> > So I use 1 here, 0 not work. Because of_mbox_index_xlate expect at least 1
> here.
> > So I need modify Documentation/devicetree/bindings/mailbox/mailbox.txt
> > and add xlate for smc mailbox?
> >
> No, you just can not use the generic xlate() provided by the api.
> Please implement your own xlate() that requires no argument.

ok. Will add xlate.

Thanks,
Peng.

> 
> Cheers!