E81-107: eDP to LVDS Bridge

The Qualcomm (e)DP driver does not support bridges. Hence this is not really a bridge driver, that means there are no attach- or enable-functions. Instead the bridge is configured when the device is probed. After this it adds itself to the list of panel drivers to be found as a remote-endpoint and optionaly pulls a hotplug-detect-gpio to high to fake to the (e)DP driver a native (e)DP has been powered on.

arch/arm64/boot/dts/seco/include/display-e81-fn070pgrgul037c.dtsi

+/*****************************************************************************/
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT)                                */
+/*
+ * Device-tree-file for the 7" FANNAL LVDS-display with the bulky name on 
+ * SECO-E81 modules
+ * see: C3007054491027A_SPEC V1.pdf
+ * 
+ * Copyright 2025 SECO NE    Dietmar Muscholik <dietmar.muscholik@seco.com>
+ *
+ *****************************************************************************/
+
+#ifndef DISPLAY_E81_FN070PGRGUL037C_DTSI
+#define DISPLAY_E81_FN070PGRGUL037C_DTSI
+
+#include "e81-pinfunc.h"
+
+
+// bridge
+&edp2lvds {
+	backlight = <&backlight0>;
+	width-mm = <154>;
+	height-mm = <86>;
+	data-mapping = "jeida-24";
+	status = "okay";
+
+	// Note: The 35571428 Hz clock is used on the
+	// i.MX93 for this display. The 33,3 MHz is
+	// the calculated clock (1056 H x 525 V x 24 FPS).
+	panel-timing {
+		clock-frequency = <33300000>;
+		//clock-frequency = <35571428>;
+		hactive = <800>;
+		hfront-porch = <210>;
+		hsync-len = <6>;
+		hback-porch = <40>;
+		//htotal = <1056>;
+
+		vactive = <480>;
+		vfront-porch = <22>;
+		vsync-len = <3>;
+		vback-porch = <20>;
+		//vtotal = <525>;
+
+		vsync-active = <0>;
+		hsync-active = <0>;
+		de-active = <1>;
+		pixelclk-active = <1>;
+	};
+};
+
+
+// qualcomm edp
+&mdss_edp0 {
+	qcom,display-type = "primary";
+	status = "okay";
+};
+
+// backlight
+&backlight0 {
+	status = "okay";
+};
+
+&pm8350c_pwm {
+	status = "okay";
+};
+
+// connect to eDP
+&mdss_mdp0 {
+	connectors = <&smmu_sde_unsec &mdss_edp0>;
+};
+
+#endif