Re: [PATCH v2 5/8] drivers:input:ads7846(+tsc2046): add new common binding names, pre-calibration and flipping
From: Sebastian Reichel
Date: Fri Nov 13 2015 - 17:30:10 EST
On Fri, Nov 13, 2015 at 09:35:56PM +0100, H. Nikolaus Schaller wrote:
> commit b98abe52fa8e ("Input: add common DT binding for touchscreens")
> introduced common DT bindings for touchscreens  and a helper function to
> parse the DT.
> This has been integrated and interpretation of the inversion (flipping)
> properties for the x and y axis has been added to accommodate any
> orientation of the touch in relation to the LCD.
> By scaling the min/max ADC values to the screen size it is now possible to
> pre-calibrate the touch so that is (almost) exactly matches the LCD it is
> glued onto. This allows to well enough operate the touch before a user
> space calibration can improve the precision.
> : Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
> .../devicetree/bindings/input/ads7846.txt | 8 ++-
> drivers/input/touchscreen/ads7846.c | 72 ++++++++++++++++++++--
> 2 files changed, 74 insertions(+), 6 deletions(-)
> diff --git a/Documentation/devicetree/bindings/input/ads7846.txt b/Documentation/devicetree/bindings/input/ads7846.txt
> index df8b127..ae56355 100644
> --- a/Documentation/devicetree/bindings/input/ads7846.txt
> +++ b/Documentation/devicetree/bindings/input/ads7846.txt
> @@ -26,12 +26,17 @@ Additional required properties:
> Optional properties:
> +You can optionally specify any of the touchscreen parameters described in
> + Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
> +This allows to scale, invert or swap coordinates and define the fuzz factors.
> ti,vref-delay-usecs vref supply delay in usecs, 0 for
> external vref (u16).
> ti,vref-mv The VREF voltage, in millivolts (u16).
> ti,keep-vref-on set to keep vref on for differential
> measurements as well
> - ti,swap-xy swap x and y axis
I guess this should be:
ti,swap-xy: deprecated name for touchscreen-swapped-x-y
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