linux-kernel - Re: [PATCH] ARM: dts: r8a7742-iwg21d-q7-dbcm-ca: Add device tree for camera DB

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Message-ID: <CAMuHMdUpqbzvbm4Dwt3PYB_irzNXERdSnH5KOmO-myo_=r7cAA@mail.gmail.com>
Date:   Sun, 7 Jun 2020 19:41:44 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Rob Herring <robh+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH] ARM: dts: r8a7742-iwg21d-q7-dbcm-ca: Add device tree for
 camera DB

Hi Prabhakar,

On Sun, Jun 7, 2020 at 6:19 PM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
> On Fri, Jun 5, 2020 at 1:27 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > On Wed, May 27, 2020 at 3:29 PM Lad Prabhakar
> > <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > > Add support for the camera daughter board which is connected to
> > > iWave's RZ/G1H Qseven carrier board. Also enable ttySC[0135] and
> > > ethernet1 interfaces.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@...renesas.com>
> >
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> >
> > > --- /dev/null
> > > +++ b/arch/arm/boot/dts/r8a7742-iwg21d-q7-dbcm-ca.dts
> >
> > > +&scifb1 {
> > > +       pinctrl-0 = <&scifb1_pins>;
> > > +       pinctrl-names = "default";
> > > +       status = "okay";
> >
> > Before I queue this in renesas-devel for v5.9, I have on question:
> > As this port carries RTS/CTS signals, perhaps you want to add
> >
> >     rts-gpios = <&gpio4 21 GPIO_ACTIVE_LOW>;
> >     cts-gpios = <&gpio4 17 GPIO_ACTIVE_LOW>;
> >
> Aaha the user manual mentioned RTS/CTS wasn't connected, but I tested
> this with the above which disproves the Doc. Shall I post it as a

RTS/CTS are indeed not connected to the dedicated RTS/CTS pins of
SCIFB1, so the documentation is right.
However, the pins on the serial port connector can be used as GPIOs,
hence they can be used with software-controlled RTS/CTS.

> separate patch or post a v2 including it.

Up to you, I can handle both.

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