linux-kernel - Re: [PATCH 6/6] arm64: dts: ls1028a-rdb: Add a spidev node for the mikroBUS

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Date:   Mon, 9 Mar 2020 20:50:36 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Michael Walle <michael@...le.cc>
Cc:     Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Esben Haabendal <eha@...f.com>,
        angelo@...am.it, andrew.smirnov@...il.com,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Wei Chen <weic@...dia.com>, Mohamed Hosny <mhosny@...dia.com>,
        peng.ma@....com
Subject: Re: [PATCH 6/6] arm64: dts: ls1028a-rdb: Add a spidev node for the mikroBUS

On Mon, 9 Mar 2020 at 20:35, Michael Walle <michael@...le.cc> wrote:
>
> Am 2020-03-09 15:56, schrieb Vladimir Oltean:
> > From: Vladimir Oltean <vladimir.oltean@....com>
> >
> > For debugging, it is useful to have access to the DSPI controller
> > signals. On the reference design board, these are exported to either
> > the
> > mikroBUS1 or mikroBUS2 connector (according to the CPLD register
> > BRDCFG3[SPI3]).
> >
> > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> > ---
> >  arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> > b/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> > index bb7ba3bcbe56..43f403b30dae 100644
> > --- a/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts
> > @@ -83,6 +83,20 @@
> >       };
> >  };
> >
> > +&dspi2 {
> > +     bus-num = <2>;
> > +     status = "okay";
> > +
> > +     /* mikroBUS1 */
> > +     spidev@0 {
> > +             compatible = "spidev";
>
> As far as I know this throws a warning at boot that you
> shouldn't use the compatible = "spidev", doesn't it?
>
> /*
>   * spidev should never be referenced in DT without a specific
>   * compatible string, it is a Linux implementation thing
>   * rather than a description of the hardware.
>   */
>

If this is supposed to mean that the "spidev" string is less
adequate/expressive than "rohm,dh2228fv", then ok, I'll use that.

> -michael
>
> > +             reg = <0>;
> > +             spi-max-frequency = <20000000>;
> > +             fsl,spi-cs-sck-delay = <100>;
> > +             fsl,spi-sck-cs-delay = <100>;
> > +     };
> > +};
> > +
> >  &esdhc {
> >       sd-uhs-sdr104;
> >       sd-uhs-sdr50;