linux-kernel - Re: [PATCH 1/6] arm64: dts: renesas: r8a77965: Add "reg" properties

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Message-ID: <20180223122250.GP7203@w540>
Date:   Fri, 23 Feb 2018 13:22:50 +0100
From:   jacopo mondi <jacopo@...ndi.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Arnd Bergmann <arnd@...db.de>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] arm64: dts: renesas: r8a77965: Add "reg" properties

Hi Geert,

On Fri, Feb 23, 2018 at 10:19:21AM +0100, Geert Uytterhoeven wrote:
> Hi Jacopo,
>
> On Thu, Feb 22, 2018 at 8:06 PM, Jacopo Mondi <jacopo+renesas@...ndi.org> wrote:
> > Add "reg" properties to place-holder nodes with unit address defined for
> > R-Car M3-N SoC.
> >
> > This silences the following DTC compiler warning:
> > Warning (unit_address_vs_reg): Node /soc/... has a unit name,
> > but no reg property
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
>
> A few minor nits below...
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> > --- a/arch/arm64/boot/dts/renesas/r8a77965.dtsi
> > +++ b/arch/arm64/boot/dts/renesas/r8a77965.dtsi
>
> > @@ -520,130 +521,163 @@
> >                 };
> >
> >                 avb: ethernet@...00000 {
> > +                       reg = <0 0xe6800000 0 0x800>, <0 0xe6a00000 0 0x10000>;
>
> The first reg part would be sufficient for a placeholder.
> I think even setting the size to zero would work...

Not sure I fully got your point here.

Do you mean I have to remove the second (and third, fourth...)  addresses range block
in all placeholder device nodes with multiple blocks (avb, du, rcar-sound) ?

Do you mean I have to set to 0 the address length in all placeholder nodes?
What's the point if they have to be added back once the device is
enabled?

>
> >                 du: display@...00000 {
> > +                       reg = <0 0xfeb00000 0 0x70000>,
>
> Unlike M3-W, the M3-N DU has a third channel, so the size is too small.
>

Will fix in v2

> > +                             <0 0xfeb90000 0 0x14>;
> >                         /* placeholder */
>
> > @@ -703,38 +745,47 @@
> >                 };
> >
> >                 usb2_phy1: usb-phy@...a0200 {
> > +                       reg = <0 0xee0a0200 0 0x700>;
> >                         /* placeholder */
> >                 };
>
> To be moved up, next to the other usb2 devices?

Will add a patch to move this next to other usb2 device nodes in v2.

I will send v2 as soon as first review comment gets clarified.

Thanks
   j

>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds