linux-kernel - [PATCH v2 2/3] arm64: dts: samsung,coreprimevelte: add touchscreen

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Message-ID: <20250828095028.24503-3-balejk@matfyz.cz>
Date: Thu, 28 Aug 2025 11:49:03 +0200
From: Karel Balej <balejk@...fyz.cz>
To: linux-mmc@...r.kernel.org, ulf.hansson@...aro.org,
        Duje Mihanović <duje@...emihanovic.xyz>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Karel Balej <balejk@...fyz.cz>
Subject: [PATCH v2 2/3] arm64: dts: samsung,coreprimevelte: add touchscreen

Bind touchscreen for the samsung,coreprimevelte smartphone. The
downstream code sets the VDD voltage to the exact value of 3.1 V,
however it's been empirically verified that the lower bound used here
sufficies for the proper operation of the chip and is thus used for
power-saving purposes.

Signed-off-by: Karel Balej <balejk@...fyz.cz>
---
 .../mmp/pxa1908-samsung-coreprimevelte.dts        | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts b/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
index 54131b0e5617..0ac1a24dc410 100644
--- a/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
+++ b/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
@@ -311,6 +311,11 @@ pmic@30 {
 		wakeup-source;
 
 		regulators {
+			ldo2: ldo2 {
+				regulator-min-microvolt = <1900000>;
+				regulator-max-microvolt = <3100000>;
+			};
+
 			ldo6: ldo6 {
 				regulator-boot-on;
 				regulator-min-microvolt = <1200000>;
@@ -328,6 +333,16 @@ ldo14: ldo14 {
 
 &twsi3 {
 	status = "okay";
+
+	touchscreen@50 {
+		compatible = "imagis,ist3032c";
+		reg = <0x50>;
+		interrupt-parent = <&gpio>;
+		interrupts = <72 IRQ_TYPE_EDGE_FALLING>;
+		vdd-supply = <&ldo2>;
+		touchscreen-size-x = <480>;
+		touchscreen-size-y = <800>;
+	};
 };
 
 &usb {
-- 
2.51.0