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* [PATCH v1] ARM: dts: imx7d-colibri-emmc: Add VGA overlay
@ 2026-09-01 12:49 Francesco Dolcini
  2026-09-01 16:22 ` Frank Li
  0 siblings, 1 reply; 2+ messages in thread
From: Francesco Dolcini @ 2026-09-01 12:49 UTC (permalink / raw)
  To: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Frank Li,
	Sascha Hauer, Pengutronix Kernel Team, Fabio Estevam
  Cc: Francesco Dolcini, devicetree, imx, linux-arm-kernel,
	linux-kernel

From: Francesco Dolcini <francesco.dolcini@toradex.com>

Add a device tree overlay for the VGA output on the Colibri iMX7 parallel
RGB LCD interface. The VGA output is driven through a non-programmable
video DAC without VESA DDC I2C signals to a DVI connector.

The overlay is also combined with the Aster, Evaluation Board v3, Iris
and Iris v2 carrier board device trees to provide ready-to-use DTBs.

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
---
this patch is on top of https://lore.kernel.org/all/20260723105225.194366-1-francesco@dolcini.it/
---
 arch/arm/boot/dts/nxp/imx/Makefile            | 21 +++++++
 .../dts/nxp/imx/imx7d-colibri-emmc-vga.dtso   | 59 +++++++++++++++++++
 2 files changed, 80 insertions(+)
 create mode 100644 arch/arm/boot/dts/nxp/imx/imx7d-colibri-emmc-vga.dtso

diff --git a/arch/arm/boot/dts/nxp/imx/Makefile b/arch/arm/boot/dts/nxp/imx/Makefile
index e9f95c3b8353..d1272104ef27 100644
--- a/arch/arm/boot/dts/nxp/imx/Makefile
+++ b/arch/arm/boot/dts/nxp/imx/Makefile
@@ -436,18 +436,39 @@ imx7d-colibri-emmc-eval-v3-panel-res-touch-7inch-parallel-dtbs := \
 	imx7d-colibri-emmc-eval-v3.dtb \
 	imx7d-colibri-emmc-panel-res-touch-7inch-parallel.dtbo
 
+imx7d-colibri-emmc-aster-vga-dtbs := \
+	imx7d-colibri-emmc-aster.dtb \
+	imx7d-colibri-emmc-vga.dtbo
+
+imx7d-colibri-emmc-eval-v3-vga-dtbs := \
+	imx7d-colibri-emmc-eval-v3.dtb \
+	imx7d-colibri-emmc-vga.dtbo
+
+imx7d-colibri-emmc-iris-vga-dtbs := \
+	imx7d-colibri-emmc-iris.dtb \
+	imx7d-colibri-emmc-vga.dtbo
+
+imx7d-colibri-emmc-iris-v2-vga-dtbs := \
+	imx7d-colibri-emmc-iris-v2.dtb \
+	imx7d-colibri-emmc-vga.dtbo
+
 dtb-$(CONFIG_SOC_IMX7D) += \
 	imx7d-cl-som-imx7.dtb \
 	imx7d-colibri-aster.dtb \
 	imx7d-colibri-emmc-aster.dtb \
 	imx7d-colibri-emmc-aster-panel-cap-touch-7inch-parallel.dtb \
+	imx7d-colibri-emmc-aster-vga.dtb \
 	imx7d-colibri-emmc-iris.dtb \
+	imx7d-colibri-emmc-iris-vga.dtb \
 	imx7d-colibri-emmc-iris-v2.dtb \
 	imx7d-colibri-emmc-iris-v2-panel-cap-touch-7inch-parallel.dtb \
+	imx7d-colibri-emmc-iris-v2-vga.dtb \
 	imx7d-colibri-emmc-eval-v3.dtb \
 	imx7d-colibri-emmc-eval-v3-panel-cap-touch-7inch-parallel-touch-adapter.dtb \
 	imx7d-colibri-emmc-eval-v3-panel-res-touch-7inch-parallel.dtb \
+	imx7d-colibri-emmc-eval-v3-vga.dtb \
 	imx7d-colibri-emmc-panel-cap-touch-7inch-parallel.dtbo \
+	imx7d-colibri-emmc-vga.dtbo \
 	imx7d-colibri-eval-v3.dtb \
 	imx7d-colibri-iris.dtb \
 	imx7d-colibri-iris-v2.dtb \
diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-colibri-emmc-vga.dtso b/arch/arm/boot/dts/nxp/imx/imx7d-colibri-emmc-vga.dtso
new file mode 100644
index 000000000000..cda214c13876
--- /dev/null
+++ b/arch/arm/boot/dts/nxp/imx/imx7d-colibri-emmc-vga.dtso
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/*
+ * Copyright (c) Toradex
+ *
+ * VGA output connected to the Colibri parallel RGB LCD interface through a
+ * non-programmable video DAC with a DVI connector.
+ *
+ * The VGA output is available on multiple carrier boards (including Iris,
+ * Eval, Aster) without VESA DDC I2C signals.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&{/} {
+	vga-encoder {
+		compatible = "dumb-vga-dac";
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				vga_enc_in: endpoint {
+					remote-endpoint = <&lcdif_out>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				vga_enc_out: endpoint {
+					remote-endpoint = <&dvi_connector_in>;
+				};
+			};
+		};
+	};
+
+	dvi-connector {
+		compatible = "dvi-connector";
+		analog;
+
+		port {
+			dvi_connector_in: endpoint {
+				remote-endpoint = <&vga_enc_out>;
+			};
+		};
+	};
+};
+
+&lcdif {
+	status = "okay";
+};
+
+&lcdif_out {
+	remote-endpoint = <&vga_enc_in>;
+};
-- 
2.47.3



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