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

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Message-ID: <20250824110039.28258-3-balejk@matfyz.cz>
Date: Sun, 24 Aug 2025 12:53:44 +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 mmc/next 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 240021e7a371..834b2cf1a204 100644
--- a/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
+++ b/arch/arm64/boot/dts/marvell/mmp/pxa1908-samsung-coreprimevelte.dts
@@ -312,6 +312,11 @@ pmic@30 {
 		wakeup-source;
 
 		regulators {
+			ldo2: ldo2 {
+				regulator-min-microvolt = <1900000>;
+				regulator-max-microvolt = <3100000>;
+			};
+
 			ldo6: ldo6 {
 				regulator-boot-on;
 				regulator-min-microvolt = <1200000>;
@@ -329,6 +334,16 @@ 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 {
-- 
2.50.1