ARM: dts: imx6ul-var-som: add support for LVDS display panel

Add support for the LD configuration option (LVDS encoder assembled on SOM)
so that the LVDS display panel on the concerto EVK board works properly.
Not all VAR-SOM-6UL SOMs have the LD configuration option so factor out
this functionality to a separate dtsi.

Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

6 files changed, 139 insertions, 12 deletions

diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-common.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-common.dtsi
index f099ca5d0e8f..e5637310ba63 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-common.dtsi
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-common.dtsi
@@ -44,6 +44,29 @@
 			linux,default-trigger = "heartbeat";
 		};
 	};
+
+	lvds_panel: lvds-panel {
+		compatible = "sgd,gktw70sdae4se", "panel-lvds";
+		data-mapping = "jeida-18";
+		width-mm = <153>;
+		height-mm = <86>;
+
+		panel-timing {
+			clock-frequency = <35000000>;
+			hactive = <800>;
+			vactive = <480>;
+			hback-porch = <40>;
+			hfront-porch = <40>;
+			vback-porch = <29>;
+			vfront-porch = <13>;
+			hsync-len = <48>;
+			vsync-len = <3>;
+			hsync-active = <0>;
+			vsync-active = <0>;
+			de-active = <1>;
+			pixelclk-active = <0>;
+		};
+	};
 };
 
 &can1 {
@@ -98,12 +121,6 @@
 		>;
 	};
 
-	pinctrl_pwm4: pwm4grp {
-		fsl,pins = <
-			MX6UL_PAD_GPIO1_IO05__PWM4_OUT		0x110b0
-		>;
-	};
-
 	pinctrl_rtc: rtcgrp {
 		fsl,pins = <
 			MX6UL_PAD_JTAG_MOD__GPIO1_IO10		0x1b0b0 /* RTC alarm IRQ */
@@ -139,12 +156,6 @@
 	};
 };
 
-&pwm4 {
-	pinctrl-names = "default";
-	pinctrl-0 = <&pinctrl_pwm4>;
-	status = "okay";
-};
-
 &snvs_pwrkey {
 	status = "disabled";
 };
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-full.dts b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-full.dts
index 64a3cbd8b7c3..725f34d6b7ee 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-full.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto-full.dts
@@ -14,6 +14,7 @@
 #include "imx6ul-var-som-enet2.dtsi"
 #include "imx6ul-var-som-enet1.dtsi"
 #include "imx6ul-var-som-audio.dtsi"
+#include "imx6ul-var-som-lvds-panel.dtsi"
 
 / {
 	model = "Variscite VAR-SOM-6UL Concerto Board (6UL CPU)";
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts
index 9c5cb96beeb1..c249e15772b8 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-concerto.dts
@@ -14,6 +14,7 @@
 #include "imx6ul-var-som-sd.dtsi"
 #include "imx6ul-var-som-enet2.dtsi"
 #include "imx6ul-var-som-audio.dtsi"
+#include "imx6ul-var-som-lvds-panel.dtsi"
 
 / {
 	model = "Variscite VAR-SOM-6UL Concerto Board (6UL CPU)";
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-lvds-panel.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-lvds-panel.dtsi
new file mode 100644
index 000000000000..996b37d35d6e
--- /dev/null
+++ b/arch/arm/boot/dts/nxp/imx/imx6ul-var-som-lvds-panel.dtsi
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * LVDS panel support for Variscite VAR-SOM-6UL module.
+ *
+ * Copyright 2019-2024 Variscite Ltd.
+ * Copyright 2026 Dimonoff
+ */
+
+/ {
+	lcd_backlight: lcd-backlight {
+		compatible = "pwm-backlight";
+		pwms = <&pwm4 0 2000000 0>;
+		pwm-names = "LCD_BKLT_PWM";
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <6>;
+		status = "okay";
+	};
+
+	lvds_encoder: lvds-encoder {
+		compatible = "ti,sn75lvds93", "lvds-encoder";
+		power-supply = <&reg_3p3v>;
+
+		ports {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			port@0 {
+				reg = <0>;
+
+				lvds_enc_in: endpoint {
+					remote-endpoint = <&lcdif_out>;
+				};
+			};
+
+			port@1 {
+				reg = <1>;
+
+				lvds_enc_out: endpoint {
+					remote-endpoint = <&lvds_panel_in>;
+				};
+			};
+		};
+	};
+};
+
+&iomuxc {
+	pinctrl_lcdif_ctrl: lcdif-ctrl-grp {
+		fsl,pins = <
+			MX6UL_PAD_LCD_CLK__LCDIF_CLK		0x79
+			MX6UL_PAD_LCD_ENABLE__LCDIF_ENABLE	0x79
+		>;
+	};
+
+	pinctrl_lcdif_dat: lcdif-dat-grp {
+		fsl,pins = <
+			MX6UL_PAD_LCD_DATA02__LCDIF_DATA02	0x79
+			MX6UL_PAD_LCD_DATA03__LCDIF_DATA03	0x79
+			MX6UL_PAD_LCD_DATA04__LCDIF_DATA04	0x79
+			MX6UL_PAD_LCD_DATA05__LCDIF_DATA05	0x79
+			MX6UL_PAD_LCD_DATA06__LCDIF_DATA06	0x79
+			MX6UL_PAD_LCD_DATA07__LCDIF_DATA07	0x79
+			MX6UL_PAD_LCD_DATA10__LCDIF_DATA10	0x79
+			MX6UL_PAD_LCD_DATA11__LCDIF_DATA11	0x79
+			MX6UL_PAD_LCD_DATA12__LCDIF_DATA12	0x79
+			MX6UL_PAD_LCD_DATA13__LCDIF_DATA13	0x79
+			MX6UL_PAD_LCD_DATA14__LCDIF_DATA14	0x79
+			MX6UL_PAD_LCD_DATA15__LCDIF_DATA15	0x79
+			MX6UL_PAD_LCD_DATA18__LCDIF_DATA18	0x79
+			MX6UL_PAD_LCD_DATA19__LCDIF_DATA19	0x79
+			MX6UL_PAD_LCD_DATA20__LCDIF_DATA20	0x79
+			MX6UL_PAD_LCD_DATA21__LCDIF_DATA21	0x79
+			MX6UL_PAD_LCD_DATA22__LCDIF_DATA22	0x79
+			MX6UL_PAD_LCD_DATA23__LCDIF_DATA23	0x79
+		>;
+	};
+
+	pinctrl_pwm4: pwm4-grp {
+		fsl,pins = <
+			MX6UL_PAD_GPIO1_IO05__PWM4_OUT		0x110b0 /* LCD BACKLIGHT */
+		>;
+	};
+};
+
+&lcdif {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_lcdif_dat
+		     &pinctrl_lcdif_ctrl>;
+	status = "okay";
+
+	port {
+		lcdif_out: endpoint {
+			remote-endpoint = <&lvds_enc_in>;
+		};
+	};
+};
+
+&lvds_panel {
+	status = "okay";
+
+	port {
+		lvds_panel_in: endpoint {
+			remote-endpoint = <&lvds_enc_out>;
+		};
+	};
+};
+
+/* PWM LCD */
+&pwm4 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm4>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto-full.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto-full.dts
index 2e1f75d5f25a..1b7c1a3383ee 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto-full.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto-full.dts
@@ -14,6 +14,7 @@
 #include "imx6ul-var-som-enet2.dtsi"
 #include "imx6ul-var-som-enet1.dtsi"
 #include "imx6ul-var-som-audio.dtsi"
+#include "imx6ul-var-som-lvds-panel.dtsi"
 
 / {
 	model = "Variscite VAR-SOM-6UL Concerto Board (6ULL CPU)";
diff --git a/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto.dts b/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto.dts
index 43a477db652f..9c9d16eb1a11 100644
--- a/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto.dts
+++ b/arch/arm/boot/dts/nxp/imx/imx6ull-var-som-concerto.dts
@@ -13,6 +13,7 @@
 #include "imx6ul-var-som-sd.dtsi"
 #include "imx6ul-var-som-enet2.dtsi"
 #include "imx6ul-var-som-audio.dtsi"
+#include "imx6ul-var-som-lvds-panel.dtsi"
 
 / {
 	model = "Variscite VAR-SOM-6UL Concerto Board (6ULL CPU)";