linux-kernel - [PATCH 4.9 141/159] ARM: dts: imx7d-sdb: config the max pressure for tsc2046

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Message-Id: <20221024112954.607235171@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:31:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Haibo Chen <haibo.chen@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 141/159] ARM: dts: imx7d-sdb: config the max pressure for tsc2046

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

[ Upstream commit e7c4ebe2f9cd68588eb24ba4ed122e696e2d5272 ]

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@...6ul7d:~# 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@....com>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 2f33c463cbce..83867357f135 100644
--- a/arch/arm/boot/dts/imx7d-sdb.dts
+++ b/arch/arm/boot/dts/imx7d-sdb.dts
@@ -126,12 +126,7 @@
 		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;
 	};
 };
-- 
2.35.1