[PATCH v2 2/2] arm64: dts: st: add Engicam MicroGEA-STM32MP257D-RMM LVDS display overlay

[Dario Binacchi <dario.binacchi@amarulasolutions.com>]

Add an overlay for the variant fitted with the AM-1280800W8TZQW-T00H
10.1" 1280x800 LVDS panel. Its touchscreen is connected over USB, so
there is no touchscreen node.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

---

(no changes since v1)

 arch/arm64/boot/dts/st/Makefile               |  6 ++
 ...gea-rmm-overlay-am-1280800w8tzqw-t00h.dtso | 67 +++++++++++++++++++
 .../st/stm32mp257d-engicam-microgea-rmm.dts   |  2 +-
 3 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h.dtso

diff --git a/arch/arm64/boot/dts/st/Makefile b/arch/arm64/boot/dts/st/Makefile
index 218ff7fdf576..7f657d2bd629 100644
--- a/arch/arm64/boot/dts/st/Makefile
+++ b/arch/arm64/boot/dts/st/Makefile
@@ -1,4 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
+stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h-dtbs := \
+	stm32mp257d-engicam-microgea-rmm.dtb \
+	stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h.dtbo
+
 stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a-dtbs := \
 	stm32mp257d-engicam-microgea-rmm.dtb \
 	stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a.dtbo
@@ -7,6 +11,8 @@ dtb-$(CONFIG_ARCH_STM32) += \
 	stm32mp215f-dk.dtb \
 	stm32mp235f-dk.dtb \
 	stm32mp257d-engicam-microgea-rmm.dtb \
+	stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h.dtb \
+	stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h.dtbo \
 	stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a.dtb \
 	stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a.dtbo \
 	stm32mp257f-dk.dtb \
diff --git a/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h.dtso b/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h.dtso
new file mode 100644
index 000000000000..7655c1bf56b1
--- /dev/null
+++ b/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-am-1280800w8tzqw-t00h.dtso
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2026 Amarula Solutions, Dario Binacchi <dario.binacchi@amarulasolutions.com>
+ * Copyright (C) 2026 Engicam srl
+ *
+ * Ampire AM-1280800W8TZQW-T00H 10.1" 1280x800 LVDS panel. Its touchscreen
+ * controller is connected over USB.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/clock/st,stm32mp25-rcc.h>
+
+&{/} {
+	panel-lvds {
+		compatible = "ampire,am-1280800w8tzqw-t00h";
+		backlight = <&backlight>;
+		power-supply = <&reg_3v3>;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&lvds_out>;
+			};
+		};
+	};
+};
+
+&framebuffer {
+	clocks = <&rcc CK_BUS_LTDC>, <&rcc CK_KER_LTDC>,
+		 <&rcc CK_BUS_LVDS>, <&rcc CK_KER_LVDSPHY>;
+};
+
+&ltdc {
+	status = "okay";
+
+	port {
+		ltdc_out: endpoint {
+			remote-endpoint = <&lvds_in>;
+		};
+	};
+};
+
+&lvds {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		port@0 {
+			reg = <0>;
+
+			lvds_in: endpoint {
+				remote-endpoint = <&ltdc_out>;
+			};
+		};
+
+		port@1 {
+			reg = <1>;
+
+			lvds_out: endpoint {
+				remote-endpoint = <&panel_in>;
+			};
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm.dts b/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm.dts
index faedddc2c914..96b7cb6b5bc1 100644
--- a/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm.dts
+++ b/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm.dts
@@ -43,7 +43,7 @@ chosen {
 		#size-cells = <2>;
 		ranges;
 
-		framebuffer {
+		framebuffer: framebuffer {
 			compatible = "simple-framebuffer";
 			clocks = <&rcc CK_BUS_LTDC>, <&rcc CK_KER_LTDC>;
 			lcd-supply = <&reg_3v3>;
-- 
2.43.0