[PATCH] arm64: dts: rockchip: Enable touchscreen on UNIHIKER M10 V1.2

[Miotsuki Mizuno <founder@crepuse.com>]

Describe the onboard NS2009 resistive touchscreen at I2C2 address 0x48.
Use the tested inverted Y direction and raw Z1 contact threshold of 150.
Retain the native 12-bit ADC coordinate range.

The I2C2 controller is enabled by a separate board preparation patch.
This device node is independent of the display binding and DTS changes,
and depends on the separately submitted NS2009 binding and driver.

Link: https://lore.kernel.org/r/20261009144729.85832-1-founder@crepuse.com
Signed-off-by: Mizuno Miotsuki <founder@crepuse.com>
---

This board patch depends on the common I2C2 preparation commit and the
separately submitted NS2009 vendor-prefix/binding series. Those NS2009
dependencies are not in the pinned Rockchip tree; only the validation
branch imports them unchanged. The display series has no such dependency.
The prerequisite I2C2 board patch was submitted separately:
https://lore.kernel.org/r/20261010232831.26908-1-founder@crepuse.com

Validation: native DTS build passed, but native dt-validate -m reports
an unmatched NS2009 compatible. With submitted dependencies, target
CHECK_DTBS=y, direct dt-validate and binding example checks passed.
The exact combined DTB booted normally; the tester confirmed touch
direction and operation. Capture: nine down/up pairs, 208 frames, no
SYN_DROPPED, final released. One E0 ff ff invalid sample (-EIO) was
recorded; this is disclosed for review of the pending NS2009 support.
Deep suspend and calibrated five-point coverage are not claimed.

 arch/arm64/boot/dts/rockchip/rk3308-unihiker-m10-v1.2.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3308-unihiker-m10-v1.2.dts b/arch/arm64/boot/dts/rockchip/rk3308-unihiker-m10-v1.2.dts
index 0c03f118378a..7ae3cc8a86e0 100644
--- a/arch/arm64/boot/dts/rockchip/rk3308-unihiker-m10-v1.2.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3308-unihiker-m10-v1.2.dts
@@ -134,6 +134,13 @@ &emmc {
 &i2c2 {
 	clock-frequency = <400000>;
 	status = "okay";
+
+	touchscreen@48 {
+		compatible = "nsiway,ns2009";
+		reg = <0x48>;
+		touchscreen-min-pressure = <150>;
+		touchscreen-inverted-y;
+	};
 };
 
 &io_domains {

base-commit: f4f7ecd2e0e8debcbab4789717cc79d570d665e3
-- 
2.56.0