linux-kernel - Re: [PATCH] ARM: dts: r8a7742-iwg21d-q7-dbcm-ca: Add OV7725 nodes

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Message-ID: <CA+V-a8tqP=LTcOZJ+7wskgDtCs4+yosmm_tb0VCVdVJsYjLD7A@mail.gmail.com>
Date:   Tue, 24 Nov 2020 13:51:38 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH] ARM: dts: r8a7742-iwg21d-q7-dbcm-ca: Add OV7725 nodes

Hi Geert,

Thank you for the review.

On Tue, Nov 24, 2020 at 9:04 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Fri, Nov 20, 2020 at 4:13 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > Add the ov7725 endpoint nodes to the camera daughter board. The ov7725
> > sensors can be populated on I2C{0,1,2,3} buses.
> >
> > By default the VIN{0,1,2,3} are tied to OV5640{0,1,2,3} endpoints
> > respectively in the camera DB dts hence the remote-endpoint property in
> > OV7725{0,1,2,3} endpoints is commented out.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
>
> Thanks for your patch!
>
> The camera definitions look mostly OK to me.
>
> IIUIC, these are 4 plug-in cameras, that can be used instead of the
> (currently described) 4 other OV5640-based plug-in cameras?
> In addition, the user can mix and match them, in the 4 available
> slots (J11-J14), which would require editing the DTS?
>
> Wouldn't it be easier to have separate DTS files for the OV7725 and
> OV5640 cameras, and #include them from r8a7742-iwg21d-q7-dbcm-ca.dts?
>
Good point, will move the vin and ov5640 nodes to
r8a7742-iwg21d-q7-dbcm-ov5640.dtsi and similarly add vin and ov7725
nodes to r8a7742-iwg21d-q7-dbcm-ov7725.dtsi and by default shall
include r8a7742-iwg21d-q7-dbcm-ov5640.dtsi in
r8a7742-iwg21d-q7-dbcm-ca.dts file.(Will keep the mclk_camx and
pimuxes in r8a7742-iwg21d-q7-dbcm-ca.dts file)

>     /* 8bit CMOS Camera 1 (J13) */
>     #define MCLK_CAM    &mclk_cam1
>     #define ...
>     /* Comment the below according to connected cameras */
>     #include "ov5640.dts"
>     //#include "ov7725.dts"
>     #undef MCLK_CAM
>     #undef ...
>
>     [...]
>
> > --- a/arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts
> > +++ b/arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts
>
> > @@ -152,6 +198,30 @@
> >                         };
> >                 };
> >         };
> > +
> > +       ov7725@21 {
> > +               status = "disabled";
>
> This one is disabled, the three others aren't?
>
my bad should have dropped this.

Cheers,
Prabhakar


> > +               compatible = "ovti,ov7725";
> > +               reg = <0x21>;
> > +               clocks = <&mclk_cam3>;
> > +
> > +               port {
> > +                       ov7725_2: endpoint {
> > +                               bus-width = <8>;
> > +                               bus-type = <6>;
> > +                               /*
> > +                                * uncomment remote-endpoint property to
> > +                                * tie ov7725_2 to vin2ep also make
> > +                                * sure to comment/remove remote-endpoint
> > +                                * property from ov5640_2 endpoint and
> > +                                * replace remote-endpoint property in
> > +                                * vin2ep node with
> > +                                * remote-endpoint = <&ov7725_2>;
> > +                                */
> > +                               /* remote-endpoint = <&vin2ep>; */
> > +                       };
> > +               };
> > +       };
> >  };
>
> 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