linux-kernel - Re: [PATCH v3 2/2] ARM: dts: r8a7742-iwg21d-q7-dbcm-ca: Add support for 8-bit ov7725 sensors

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Date:   Tue, 15 Dec 2020 15:57:32 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        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>, LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v3 2/2] ARM: dts: r8a7742-iwg21d-q7-dbcm-ca: Add support
 for 8-bit ov7725 sensors

Hi Jacopo,

Thank you for the review.

On Tue, Dec 15, 2020 at 11:49 AM Jacopo Mondi <jacopo@...ndi.org> wrote:
>
> Hello,
>
> On Thu, Nov 26, 2020 at 10:30:53AM +0000, Lad Prabhakar wrote:
> > The 8-bit ov7725 sensors can also be connected to the camera daughter
> > board.
> >
> > This patch creates a separate dtsi file for ov7725 sensors and is included
> > in r8a7742-iwg21d-q7-dbcm-ca.dts. The user can set VINx_SENSOR depending
> > on the cameras connected.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> >  .../boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts    |   7 ++
> >  .../dts/r8a7742-iwg21d-q7-dbcm-ov7725.dtsi    | 112 ++++++++++++++++++
> >  2 files changed, 119 insertions(+)
> >  create mode 100644 arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ov7725.dtsi
> >
> > diff --git a/arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts b/arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts
> > index 1ab4f9771a34..915ff5fd437c 100644
> > --- a/arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts
> > +++ b/arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts
> > @@ -11,6 +11,7 @@
> >
> >  #define SENSOR_NONE          1
> >  #define SENSOR_OV5640                2
> > +#define SENSOR_OV7725                3
> >
> >  /* 8bit CMOS Camera 1 (J13) */
> >  #define CAM1_PARENT_I2C              i2c0
> > @@ -40,6 +41,11 @@
> >   * VIN2 interface and also the ov5640 node connected to it)
> >   *      #define VIN2_SENSOR          SENSOR_NONE
> >   *
> > + * To tie VINx endpoints to ov7725_x endpoints set VINx_SENSOR to
> > + * SENSOR_OV7725 for example if ov7725_3 is connected to the VIN3
> > + * interface set the below (this disables the ov5640_3)
> > + *      #define VIN3_SENSOR          SENSOR_OV7725
> > + *
> >   */
> >  #define VIN0_SENSOR          SENSOR_OV5640
> >  #define VIN1_SENSOR          SENSOR_OV5640
> > @@ -47,6 +53,7 @@
> >  #define VIN3_SENSOR          SENSOR_OV5640
> >
> >  #include "r8a7742-iwg21d-q7-dbcm-ov5640.dtsi"
> > +#include "r8a7742-iwg21d-q7-dbcm-ov7725.dtsi"
>
> Mmm, can't we alternatively include one .dtsi or the other depending
> on a define symbol ? The .dtsi describe pluggable expansion boards,
> they cannot be mixed, right ?
>
Since the cameras on the daughter can be mixed and matched a much
better version of the patches [1] which handle this case elegantly has
been posted by Geert.

[1] https://patchwork.kernel.org/project/linux-renesas-soc/cover/20201126134031.4115211-1-geert@linux-m68k.org/

Cheers,
Prabhakar