arm64: dts: renesas: Add support for Advantech idk-1110wr LVDS panel

This patch adds support for Advantech idk-1110wr LVDS panel.
The HiHope RZ/G2[MN] is advertised as compatible with panel
idk-1110wr from Advantech, however the panel isn't sold alongside
the board.
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/1570029619-43238-10-git-send-email-biju.das@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg2-advantech-idk-1110wr-panel.dtsi

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device Tree Source for the Advantech idk-1110wr LVDS panel connected
+ * to RZ/G2 boards
+ *
+ * Copyright (C) 2019 Renesas Electronics Corp.
+ */
+
+/ {
+	panel-lvds {
+		compatible = "advantech,idk-1110wr", "panel-lvds";
+
+		width-mm = <223>;
+		height-mm = <125>;
+
+		data-mapping = "jeida-24";
+
+		panel-timing {
+			/* 1024x600 @60Hz */
+			clock-frequency = <51200000>;
+			hactive = <1024>;
+			vactive = <600>;
+			hsync-len = <240>;
+			hfront-porch = <40>;
+			hback-porch = <40>;
+			vfront-porch = <15>;
+			vback-porch = <10>;
+			vsync-len = <10>;
+		};
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&lvds_connector>;
+			};
+		};
+	};
+};
+
+&lvds_connector {
+	remote-endpoint = <&panel_in>;
+};