linux-kernel - Re: [PATCH v7 4/9] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings

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Date:   Sun, 10 Jun 2018 13:32:11 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Eugen Hristev <eugen.hristev@...rochip.com>
Cc:     <ludovic.desroches@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-iio@...r.kernel.org>, <linux-input@...r.kernel.org>,
        <nicolas.ferre@...rochip.com>, <dmitry.torokhov@...il.com>,
        <robh@...nel.org>
Subject: Re: [PATCH v7 4/9] dt-bindings: input: touchscreen:
 resistive-adc-touch: create bindings

On Tue, 22 May 2018 10:52:34 +0300
Eugen Hristev <eugen.hristev@...rochip.com> wrote:

> Added bindings for generic resistive touchscreen ADC.
> 
> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
> Reviewed-by: Rob Herring <robh@...nel.org>
Applied, thanks

Jonathan
> ---
> Changes in v5:
>  - changed property name touchscreen-threshold-pressure to
> touchscreen-min-pressure
> 
> Changes in v3:
>  - renamed file and compatible to exclude "generic" keyword
>  - removed the pressure threshold property, added it as a common
> touchscreen property in the touchscreen common bindings in a separate
> commit.
> 
> Changes in v2:
>  - modified bindings to have a generic resistive touchscreen adc driver
> instead of specific architecture one.
> 
>  .../input/touchscreen/resistive-adc-touch.txt      | 30 ++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
> new file mode 100644
> index 0000000..51456c0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
> @@ -0,0 +1,30 @@
> +Generic resistive touchscreen ADC
> +
> +Required properties:
> +
> + - compatible: must be "resistive-adc-touch"
> +The device must be connected to an ADC device that provides channels for
> +position measurement and optional pressure.
> +Refer to ../iio/iio-bindings.txt for details
> + - iio-channels: must have at least two channels connected to an ADC device.
> +These should correspond to the channels exposed by the ADC device and should
> +have the right index as the ADC device registers them. These channels
> +represent the relative position on the "x" and "y" axes.
> + - iio-channel-names: must have all the channels' names. Mandatory channels
> +are "x" and "y".
> +
> +Optional properties:
> + - iio-channels: The third channel named "pressure" is optional and can be
> +used if the ADC device also measures pressure besides position.
> +If this channel is missing, pressure will be ignored and the touchscreen
> +will only report position.
> + - iio-channel-names: optional channel named "pressure".
> +
> +Example:
> +
> +	resistive_touch: resistive_touch {
> +		compatible = "resistive-adc-touch";
> +		touchscreen-min-pressure = <50000>;
> +		io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
> +		io-channel-names = "x", "y", "pressure";
> +	};