linux-kernel - [PATCH v3 6/6] arm64: dts: exynos7870-j6lte: enable display panel support

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Message-Id: <20250928-exynos7870-drm-dts-v3-6-bb7d8e570860@disroot.org>
Date: Sun, 28 Sep 2025 23:26:40 +0530
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Kaustabh Chakraborty <kauschluss@...root.org>
Subject: [PATCH v3 6/6] arm64: dts: exynos7870-j6lte: enable display panel
 support

Enable DECON and DSI nodes, and add the compatible display panel and
appropriate panel timings for this device. Also, remove the
simple-framebuffer node in favor of the panel.

This device has a 720x1480 AMOLED Samsung AMS561RA01 panel with
S6E8AA5X01 controller.

Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
 arch/arm64/boot/dts/exynos/exynos7870-j6lte.dts | 38 ++++++++++++++++---------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/arch/arm64/boot/dts/exynos/exynos7870-j6lte.dts b/arch/arm64/boot/dts/exynos/exynos7870-j6lte.dts
index b8ce433b93b1b488da31bbe4846f8092243611ad..f92e1f8fabf3e01b69583f82cf842178a21002a2 100644
--- a/arch/arm64/boot/dts/exynos/exynos7870-j6lte.dts
+++ b/arch/arm64/boot/dts/exynos/exynos7870-j6lte.dts
@@ -27,20 +27,7 @@ aliases {
 	};
 
 	chosen {
-		#address-cells = <2>;
-		#size-cells = <1>;
-		ranges;
-
 		stdout-path = &serial2;
-
-		framebuffer@...00000 {
-			compatible = "simple-framebuffer";
-			reg = <0x0 0x67000000 (720 * 1480 * 4)>;
-			width = <720>;
-			height = <1480>;
-			stride = <(720 * 4)>;
-			format = "a8r8g8b8";
-		};
 	};
 
 	gpio-hall-effect-sensor {
@@ -119,8 +106,9 @@ ramoops@...00000 {
 			pmsg-size = <0x4000>;
 		};
 
-		framebuffer@...00000 {
+		cont_splash_mem: framebuffer@...00000 {
 			reg = <0x0 0x67000000 (720 * 1480 * 4)>;
+			iommu-addresses = <&decon 0x67000000 (720 * 1480 * 4)>;
 			no-map;
 		};
 	};
@@ -133,6 +121,28 @@ vibrator {
 	};
 };
 
+&decon {
+	memory-region = <&cont_splash_mem>;
+
+	status = "okay";
+};
+
+&dsi {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	samsung,burst-clock-frequency = <500000000>;
+	samsung,esc-clock-frequency = <16000000>;
+	samsung,pll-clock-frequency = <26000000>;
+
+	status = "okay";
+
+	panel@0 {
+		compatible = "samsung,s6e8aa5x01-ams561ra01";
+		reg = <0>;
+	};
+};
+
 &gpu {
 	status = "okay";
 };

-- 
2.51.0