On Sun, Dec 06, 2015 at 08:52:16PM +0100, Markus Pargmann wrote:
> This is the touchscreen conversion queue binding documentation. It uses
> the shared imx25 ADC.
>
> Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
> ---
>
> Notes:
> Changes in v9:
> - Updated binding descriptions
>
> Changes in v5:
> - Fix signed/unsigned comparison
> - Fix unused variable settling_time by putting it in the correct argument list
> - Use continous conversion queue with the repeat feature and a proper
> repeat-wait. Previously the touchscreen caused massive number of interrupts.
>
> .../bindings/input/touchscreen/fsl-mx25-tcq.txt | 35 ++++++++++++++++++++++
> 1 file changed, 35 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt
> new file mode 100644
> index 000000000000..d45e50872114
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl-mx25-tcq.txt
> @@ -0,0 +1,35 @@
> +Freescale mx25 TS conversion queue module
> +
> +mx25 touchscreen conversion queue module which controls the ADC unit of the
> +mx25 for attached touchscreens.
> +
> +Required properties:
> + - compatible: Should be "fsl,imx25-tcq".
> + - reg: Memory range of the device.
> + - interrupts: Should be the interrupt number associated with this module within
> + the tscadc unit (<0>).
> + - interrupt-parent: Should be a phandle to the tscadc unit.
> + - fsl,wires: Should be '<4>' or '<5>'
> +
> +Optional properties:
> + - fsl,pen-debounce: Pen debounce time in nanoseconds.
This and ...
> + - fsl,pen-threshold: Pen-down threshold for the touchscreen. This is a value
> + between 1 and 4096. It is the ratio between the internal reference voltage
> + and the measured voltage after the plate was precharged. Resistence between
> + plates and therefore the voltage decreases with pressure so that a smaller
> + value is equivalent to a higher pressure.
> + - fsl,settling-time: Settling time in nanoseconds. The settling time is before
> + the actual touch detection to wait for an even charge distribution in the
> + plate.
... this still need units (-ns) appended to the property name.
> +
> +This device includes two conversion queues which can be added as subnodes.
> +The first queue is for the touchscreen, the second for general purpose ADC.
> +
> +Example:
> + tsc: tcq@50030400 {
> + compatible = "fsl,imx25-tcq";
> + reg = <0x50030400 0x60>;
> + interrupt-parent = <&tscadc>;
> + interrupts = <0>;
> + fsl,wires = <4>;
> + };
> --
> 2.6.2
>
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