Re: [PATCH V3 2/2] doc:devicetree: Add AD7949 device tree bindings in documentation

[Jonathan Cameron <jic23@kernel.org>]

On Tue, 23 Oct 2018 10:43:19 -0500
Rob Herring <robh@kernel.org> wrote:

> On Mon, Oct 22, 2018 at 11:02:43PM +0200, Charles-Antoine Couret wrote:
> > Description how to invoke ad7949 driver from device tree file.  
> 
> Use subject prefixes that match the subsystem (i.e run git log --oneline 
> <dir> to see). Something like this would be better:
> 
> dt-bindings: iio: adc: Add Analog Devices AD7949, AD7682 and AD7689
I've modified this and changed as below in the interests of saving everyone
time that a V4 and it's review would take!
Thanks for the review Rob.

Applied to the togreg branch of iio.git and pushed out as testing for the
autobuilders to play with it.

Thanks,
Jonathan

> 
> > 
> > Signed-off-by: Charles-Antoine Couret <charles-antoine.couret@essensium.com>
> > ---
> > V1 to V3:
> > * Add prefix vendor
> > * Improve patch description
> > 
> >  .../devicetree/bindings/iio/adc/ad7949.txt     | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/adc/ad7949.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/ad7949.txt b/Documentation/devicetree/bindings/iio/adc/ad7949.txt
> > new file mode 100644
> > index 000000000000..f1c3af53f5cc
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/adc/ad7949.txt
> > @@ -0,0 +1,18 @@
> > +* Analog Devices AD7949/AD7682/AD7689
> > +
> > +Required properties:
> > + - compatible: Should be one of
> > +	* "adi,ad7949"
> > +	* "adi,ad7682"
> > +	* "adi,ad7689"
> > + - reg: spi chip select number for the device
> > + - vref-supply: The regulator supply for ADC reference voltage
> > + - spi-max-frequency: Max SPI frequency to use (< 33000000)  
> 
> This should be optional and only be needed if the frequency needs to be 
> limited below what the host and device can support. IOW, a board 
> limitation. The host and device drivers already need to know their 
> maximum frequencies to validate this value.
I dropped this from the binding as it is generic anyway rather than
device specific.

> 
> > +
> > +Example:
> > +adc@0 {
> > +	compatible = "adi,ad7949";
> > +	reg = <0>;
> > +	vref-supply = <&vdd_supply>;
> > +	spi-max-frequency = <200000>;
> > +};
> > -- 
> > 2.19.1
> >