linux-kernel - Re: [PATCH v2 1/4] iio: hx711: add data-ready-delay-ns property in DT

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Date:   Sat, 30 Jun 2018 18:32:32 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Andreas Klinger <ak@...klinger.de>
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 v2 1/4] iio: hx711: add data-ready-delay-ns property in
 DT

On Mon, 25 Jun 2018 17:18:02 +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>

Hmm. It's not particularly generic... I think this should have
have vendor prefix until we have some visibility of whether it
is a common thing we want to standardise around or not.

I'll also be waiting for a devicetree ack on this one as it's a
tiny bit unusual.

Thanks,

Jonathan
> ---
>  Documentation/devicetree/bindings/iio/adc/avia-hx711.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt b/Documentation/devicetree/bindings/iio/adc/avia-hx711.txt
> index b3629405f568..d0c066e3df69 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 {
>  	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>;
>  };
>