linux-kernel - [PATCH v4 4/5] arm64: dts: exynos7870-a2corelte: enable display panel support

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Message-Id: <20251031-exynos7870-drm-dts-v4-4-c1f77fb16b87@disroot.org>
Date: Fri, 31 Oct 2025 00:50:18 +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 v4 4/5] arm64: dts: exynos7870-a2corelte: 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 540x960 Synaptics TD4101 display panel.

Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
 .../arm64/boot/dts/exynos/exynos7870-a2corelte.dts | 57 ++++++++++++++++------
 1 file changed, 43 insertions(+), 14 deletions(-)

diff --git a/arch/arm64/boot/dts/exynos/exynos7870-a2corelte.dts b/arch/arm64/boot/dts/exynos/exynos7870-a2corelte.dts
index 07467158ee6a37e17402fb50554184c4c93f77d5..6f40ca4350ed72b57e511165e53f00e77f8978f3 100644
--- a/arch/arm64/boot/dts/exynos/exynos7870-a2corelte.dts
+++ b/arch/arm64/boot/dts/exynos/exynos7870-a2corelte.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 (540 * 960 * 4)>;
-			width = <540>;
-			height = <960>;
-			stride = <(540 * 4)>;
-			format = "a8r8g8b8";
-		};
 	};
 
 	gpio-keys {
@@ -110,8 +97,9 @@ ramoops@...00000 {
 			pmsg-size = <0x4000>;
 		};
 
-		framebuffer@...00000 {
+		cont_splash_mem: framebuffer@...00000 {
 			reg = <0x0 0x67000000 (540 * 960 * 4)>;
+			iommu-addresses = <&decon 0x67000000 (540 * 960 * 4)>;
 			no-map;
 		};
 	};
@@ -124,6 +112,47 @@ vibrator {
 	};
 };
 
+&decon {
+	memory-region = <&cont_splash_mem>;
+
+	status = "okay";
+};
+
+&dsi {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	samsung,burst-clock-frequency = <836000000>;
+	samsung,esc-clock-frequency = <16000000>;
+	samsung,pll-clock-frequency = <26000000>;
+
+	status = "okay";
+
+	panel@0 {
+		compatible = "syna,td4101-panel";
+		reg = <0>;
+
+		backlight-gpios = <&gpd3 7 GPIO_ACTIVE_LOW>;
+
+		width-mm = <62>;
+		height-mm = <110>;
+
+		panel-timing {
+			clock-frequency = <69336720>;
+
+			hactive = <540>;
+			hsync-len = <4>;
+			hfront-porch = <364>;
+			hback-porch = <40>;
+
+			vactive = <960>;
+			vsync-len = <2>;
+			vfront-porch = <244>;
+			vback-porch = <13>;
+		};
+	};
+};
+
 &gpu {
 	status = "okay";
 };

-- 
2.51.0