linux-kernel - Re: [PATCH 1/3] iio: hx711: add data-ready-delay-ns property in DT

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Date:   Sun, 24 Jun 2018 15:28:59 +0200
From:   Andreas Klinger <ak@...klinger.de>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
        robh+dt@...nel.org, mark.rutland@....com, mchehab@...nel.org,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        akpm@...ux-foundation.org, linus.walleij@...aro.org,
        rdunlap@...radead.org, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] iio: hx711: add data-ready-delay-ns property in DT

Hi Jonathan,

Jonathan Cameron <jic23@...nel.org> schrieb am Sun, 24. Jun 14:10:
> On Sat, 23 Jun 2018 20:54:21 +0200
> Andreas Klinger <ak@...klinger.de> wrote:
> 
> > add data-ready-delay-ns property for hx711 ADC
> > this is the delay after rising PD_SCK until DOUT is read and assumed to be
> > ready
> > 
> > Signed-off-by: Andreas Klinger <ak@...klinger.de>
> 
> One unconnected change.  I'm not sure it's wrong as such but it should not
> be in this patch.
> 
> > ---
> >  Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt b/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
> > index b3629405f568..8c9bcaa4d750 100644
> > --- a/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
> > +++ b/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
> > @@ -8,11 +8,18 @@ Required properties:
> >  		See Documentation/devicetree/bindings/gpio/gpio.txt
> >   - avdd-supply:	Definition of the regulator used as analog supply
> >  
> > +Optional properties:
> > + - data-ready-delay-ns:	additional delay in nanoseconds between rising of
> > +			PD_SCK until DOUT is ready
> > +			should be less then maximum PD_SCK high time which
> > +			is 50000 in the datasheet
> > +
> >  Example:
> > -weight@0 {
> > +weight {

The device tree compiler (dtc) gives a warning if there is no reg = <...>
setting. That's why i changed it to be without @0.

Should i create an individual patch for this change in this series or
create another patch which is unrelated to this series?

Andreas

> 
> Change has nothing to do with this patch...
> 
> >  	compatible = "avia,hx711";
> >  	sck-gpios = <&gpio3 10 GPIO_ACTIVE_HIGH>;
> >  	dout-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
> >  	avdd-suppy = <&avdd>;
> > +	data-ready-delay-ns = <1000>;
> >  };
> >  
> 

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