path: root/Documentation/devicetree
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authorHans de Goede <hdegoede@redhat.com>2014-05-14 11:20:45 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2014-05-14 16:40:06 -0700
commit6decea7c5438e2955f64e2513ec9a2fac7602a7d (patch)
treedc4e679f87d1042e7ad681daed6575b0eb1a14d6 /Documentation/devicetree
parent125a72d6275dc777d18aa349842e89e53ddbeefd (diff)
Input: add driver for Allwinner sunxi SoC's rtp controller
Note the sun4i-ts controller is capable of detecting a second touch, but when a second touch is present then the accuracy becomes so bad the reported touch location is not useable. The original android driver contains some complicated heuristics using the aprox. distance between the 2 touches to see if the user is making a pinch open / close movement, and then reports emulated multi-touch events around the last touch coordinate (as the dual-touch coordinates are worthless). These kinds of heuristics are just asking for trouble (and don't belong in the kernel). So this driver offers straight forward, reliable single touch functionality only. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation/devicetree')
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
new file mode 100644
index 000000000000..881aea713fc3
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
@@ -0,0 +1,15 @@
+sun4i resistive touchscreen controller
+Required properties:
+ - compatible: "allwinner,sun4i-a10-ts"
+ - reg: mmio address range of the chip
+ - interrupts: interrupt to which the chip is connected
+ rtp: rtp@01c25000 {
+ compatible = "allwinner,sun4i-a10-ts";
+ reg = <0x01c25000 0x100>;
+ interrupts = <29>;
+ };

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