linux-kernel - Re: [PATCH v5 12/12] arm64: dts: ls1028a-rdb: Add a spidev node for the mikroBUS

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Message-ID: <20200421030034.GA8571@dragon>
Date:   Tue, 21 Apr 2020 11:00:35 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.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>,
        Michael Walle <michael@...le.cc>, peng.ma@....com
Subject: Re: [PATCH v5 12/12] arm64: dts: ls1028a-rdb: Add a spidev node for
 the mikroBUS

On Mon, Apr 20, 2020 at 06:10:35PM +0300, Vladimir Oltean wrote:
> On Mon, 20 Apr 2020 at 17:38, Shawn Guo <shawnguo@...nel.org> wrote:
> >
> > On Wed, Mar 18, 2020 at 02:16:03AM +0200, Vladimir Oltean wrote:
> > > 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>
> > > ---
> > > Changes in v5:
> > > None.
> > >
> > > Changes in v4:
> > > None.
> > >
> > > Changes in v3:
> > > None.
> > >
> > > Changes in v2:
> > > Change compatible string for spidev node.
> > >
> > >  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 6d05b76c2c7a..0d27b5667b8c 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 = "rohm,dh2228fv";
> >
> > Is the compatible documented?
> >
> > Shawn
> >
> > > +             spi-max-frequency = <20000000>;
> > > +             fsl,spi-cs-sck-delay = <100>;
> > > +             fsl,spi-sck-cs-delay = <100>;
> > > +             reg = <0>;
> > > +     };
> > > +};
> > > +
> > >  &esdhc {
> > >       sd-uhs-sdr104;
> > >       sd-uhs-sdr50;
> > > --
> > > 2.17.1
> > >
> 
> I don't really know what's the status with spidev compatibles. I do
> see other device trees are using this one, I thought it should be
> fine.

My understanding is that every compatible needs to be documented.

Shawn