linux-kernel - Re: [PATCH 2/2] arm64: dts: renesas: rzg2l-smarc: Enable RSPI1 on carrier board

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Message-ID: <CA+V-a8sg5bGUVBuYuGUSLetVA811ZuRXth07JMYbG+2GScXv5A@mail.gmail.com>
Date:   Wed, 17 Nov 2021 10:36:45 +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 2/2] arm64: dts: renesas: rzg2l-smarc: Enable RSPI1 on
 carrier board

Hi Geert,

On Wed, Nov 17, 2021 at 10:25 AM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Wed, Nov 17, 2021 at 11:16 AM Lad, Prabhakar
> <prabhakar.csengg@...il.com> wrote:
> > On Wed, Nov 17, 2021 at 10:10 AM Geert Uytterhoeven
> > <geert@...ux-m68k.org> wrote:
> > > On Wed, Nov 17, 2021 at 2:12 AM Lad Prabhakar
> > > <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> > > > RSPI1 (SPI1) interface is available on PMOD0 connector (J1) on carrier
> > > > board, This patch adds pinmux and spi1 node to carrier board dtsi file.
> > > >
> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > >
> > > Thanks for your patch!
> > >
> > > > --- a/arch/arm64/boot/dts/renesas/rzg2l-smarc.dtsi
> > > > +++ b/arch/arm64/boot/dts/renesas/rzg2l-smarc.dtsi
> > > > @@ -31,6 +31,7 @@
> > > >                 i2c0 = &i2c0;
> > > >                 i2c1 = &i2c1;
> > > >                 i2c3 = &i2c3;
> > > > +               spi1 = &spi1;
> > >
> > > Do you mind if I drop this while applying?
> > >
> > Fine by me. Any reason to do so? (I ask because in future I can take
> > care of it prior to posting)
>
> Aliases are used to match physical connectors with a device, so they
> make sense for serial and network ports.
> We don't have them for SPI on any Renesas arm64 boards.
> We do have them for I2C, but I2C differs from SPI, as on I2C you can
> instantiate new devices from sysfs.
>
Agreed makes sense now. Thank you for the clarification.

Cheers,
Prabhakar

> 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