linux-kernel - Re: [v2 1/2] dt-bindings: remoteproc: mediatek: Add binding for mt8195 scp

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Date:   Mon, 12 Jul 2021 15:01:27 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Tzung-Bi Shih <tzungbi@...gle.com>
Cc:     Tinghan Shen <tinghan.shen@...iatek.com>, ohad@...ery.com,
        bjorn.andersson@...aro.org, mathieu.poirier@...aro.org,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        srv_heupstream <srv_heupstream@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [v2 1/2] dt-bindings: remoteproc: mediatek: Add binding for
 mt8195 scp

On Mon, Jul 12, 2021 at 2:59 PM Chen-Yu Tsai <wenst@...omium.org> wrote:
>
> On Mon, Jul 12, 2021 at 2:06 PM Tzung-Bi Shih <tzungbi@...gle.com> wrote:
> >
> > On Sat, Jul 10, 2021 at 8:25 PM Tinghan Shen <tinghan.shen@...iatek.com> wrote:
> > > @@ -5,13 +5,15 @@ This binding provides support for ARM Cortex M4 Co-processor found on some
> > >  Mediatek SoCs.
> > >
> > >  Required properties:
> > > -- compatible           Should be "mediatek,mt8183-scp"
> > > +- compatible           Should be one of:
> > > +                               "mediatek,mt8183-scp"
> > > +                               "mediatek,mt8195-scp"
> > Just realized we forgot to add DT bindings for mediatek,mt8192-scp[1].
> > Could you send another patch for adding the missing property?
> >
> > [1]: https://elixir.bootlin.com/linux/v5.13.1/source/drivers/remoteproc/mtk_scp.c#L879
> >
> > > -- clocks               Clock for co-processor (See: ../clock/clock-bindings.txt)
> > > -- clock-names          Contains the corresponding name for the clock. This
> > > +- clocks               Required by mt8183. Clock for co-processor (See: ../clock/clock-bindings.txt)
> > > +- clock-names          Required by mt8183. Contains the corresponding name for the clock. This
> > >                         should be named "main".
> > Let's move clocks and clock-names to "Optional properties".  See [2]
> > for your reference.  I guess it doesn't need to mention which chip
> > needs the properties.  For those chips that need the clock properties,
> > they won't work correctly without correct clock properties.
>
> I would suggest still adding them. We will need to describe the requirements
> anyway then the binding is converted to DT schema.

Also, a coprocessor without any clock feeding it makes little sense.
Any processor requires a running clock. Whether that clock is controllable
is beside the point.

> ChenYu
>
> > [2]: https://elixir.bootlin.com/linux/v5.13.1/source/Documentation/devicetree/bindings/remoteproc/ti,keystone-rproc.txt#L87
> >
> >
> > Suggested to provide a cover letter for the series next time.
> >
> > nit: other patches usually use "[PATCH v2 1/2]" in the email title
> > instead of the one used in the mail.
> >
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek

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