linux-kernel - Re: [PATCH 4/4] staging: iio: ad9832: add devicetree documentation

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Message-ID: <20190402163614.xsnut6ev7dceku55@smtp.gmail.com>
Date:   Tue, 2 Apr 2019 13:36:14 -0300
From:   Marcelo Schmitt <marcelo.schmitt1@...il.com>
To:     Alexandru Ardelean <ardeleanalex@...il.com>
Cc:     lars@...afoo.de,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        stefan.popa@...log.com, Jonathan Cameron <jic23@...nel.org>,
        knaack.h@....de, Peter Meerwald-Stadler <pmeerw@...erw.net>,
        gregkh@...uxfoundation.org, linux-iio@...r.kernel.org,
        devel@...verdev.osuosl.org, LKML <linux-kernel@...r.kernel.org>,
        kernel-usp@...glegroups.com
Subject: Re: [PATCH 4/4] staging: iio: ad9832: add devicetree documentation

On 04/02, Alexandru Ardelean wrote:
> On Mon, Apr 1, 2019 at 5:38 PM Marcelo Schmitt
> <marcelo.schmitt1@...il.com> wrote:
> >
> > Add a devicetree documentation for the ad9832 direct digital
> > synthesizer, waveform generator.
> >
> > Signed-off-by: Marcelo Schmitt <marcelo.schmitt1@...il.com>
> > ---
> >  .../bindings/iio/frequency/ad9832.txt         | 26 +++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/frequency/ad9832.txt
> >
> > diff --git a/Documentation/devicetree/bindings/iio/frequency/ad9832.txt b/Documentation/devicetree/bindings/iio/frequency/ad9832.txt
> > new file mode 100644
> > index 000000000000..6a35fdff5a48
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/frequency/ad9832.txt
> > @@ -0,0 +1,26 @@
> > +Analog Devices AD9832 Direct Digital Synthesizer, Waveform Generator
> > +
> > +Data sheet:
> > +https://www.analog.com/media/en/technical-documentation/data-sheets/AD9832.pdf
> > +
> > +Required properties:
> > +       - compatible : Must be "adi,ad9832"
> > +       - reg : SPI chip select number for the device
> > +       - spi-max-frequency = Max SPI frequency to use (< 25000000)
> > +       - clocks : The clock reference for the DDS output
> > +       - clock-names : Must be "mclk"
> 
> It's always a good idea to reference other base dt docs.
> For SPI you could:
> 
> ```
> For more information on SPI properties, please consult
>      Documentation/devicetree/bindings/spi/spi-bus.txt
> ```
> 
> For clock:
> ```
> For more information on clock bindings properties, please consult
>      Documentation/devicetree/bindings/clock/clock-bindings.txt
> ```
> 
> For regulator:
> ```
> For more information on regulator bindings properties, please consult
>      Documentation/devicetree/bindings/regulator/regulator.txt
> ```

Thanks for the advice. I'll have a look at them.

> 
> > +
> > +Optional properties:
> > +       - avdd-supply:  Definition of the regulator used as analog supply
> > +       - dvdd-supply : Definition of the regulator used as digital supply
> > +
> > +Example:
> > +       adi9832-dds@0 {
> > +               compatible = "adi,ad9832";
> > +               reg = <0>;
> > +               spi-max-frequency = <25000000>;
> > +               clocks = <&ad9832_mclk>;
> > +               clock-names = "mclk";
> > +               avdd-suppy = <&avdd>;
> > +               dvdd-suppy = <&dvdd>;
> > +       };
> > --
> > 2.20.1
> >