From: Haibo Chen <haibo.chen@xxxxxxx>
Use the general touchscreen method to config the max pressure for
touch tsc2046(data sheet suggest 8 bit pressure), otherwise, for
ABS_PRESSURE, when config the same max and min value, weston will
meet the following issue,
[17:19:39.183] event1 - ADS7846 Touchscreen: is tagged by udev as: Touchscreen
[17:19:39.183] event1 - ADS7846 Touchscreen: kernel bug: device has min == max on ABS_PRESSURE
[17:19:39.183] event1 - ADS7846 Touchscreen: was rejected
[17:19:39.183] event1 - not using input device '/dev/input/event1'
This will then cause the APP weston-touch-calibrator can't list touch devices.
root@imx6ul7d:~# weston-touch-calibrator
could not load cursor 'dnd-move'
could not load cursor 'dnd-copy'
could not load cursor 'dnd-none'
No devices listed.
And accroding to binding Doc, "ti,x-max", "ti,y-max", "ti,pressure-max"
belong to the deprecated properties, so remove them. Also for "ti,x-min",
"ti,y-min", "ti,x-plate-ohms", the value set in dts equal to the default
value in driver, so are redundant, also remove here.
Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
---
arch/arm/boot/dts/imx7d-sdb.dts | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/arch/arm/boot/dts/imx7d-sdb.dts b/arch/arm/boot/dts/imx7d-sdb.dts
index 78f4224a9bf4..e93b9cd9c27b 100644
--- a/arch/arm/boot/dts/imx7d-sdb.dts
+++ b/arch/arm/boot/dts/imx7d-sdb.dts
@@ -206,12 +206,7 @@ tsc2046@0 {
interrupt-parent = <&gpio2>;
interrupts = <29 0>;
pendown-gpio = <&gpio2 29 GPIO_ACTIVE_HIGH>;
- ti,x-min = /bits/ 16 <0>;
- ti,x-max = /bits/ 16 <0>;
- ti,y-min = /bits/ 16 <0>;
- ti,y-max = /bits/ 16 <0>;
- ti,pressure-max = /bits/ 16 <0>;
- ti,x-plate-ohms = /bits/ 16 <400>;
+ touchscreen-max-pressure = <255>;
wakeup-source;
};
};
--
2.25.1
