[PATCH] arm: dts: imx7d-sdb: config the max pressure for tsc2046

[PATCH] arm: dts: imx7d-sdb: config the max pressure for tsc2046

[haibo.chen]

From: Haibo Chen <haibo.chen@nxp.com>

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@nxp.com>
---
 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

Re: [PATCH] arm: dts: imx7d-sdb: config the max pressure for tsc2046

[Shawn Guo]

On Mon, Jul 25, 2022 at 06:16:22PM +0800, haibo.chen@nxp.com wrote:
> From: Haibo Chen <haibo.chen@nxp.com>
> 
> 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@nxp.com>

Applied, thanks!