Boundary imx 5.4.x 2.1.0 lt8912 drm

arch/arm64/boot/dts/freescale/Makefile

@@ -61,6 +61,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-evk.dtb imx8mm-evk-rpmsg.dtb imx8mm-evk-rm67191
 			  imx8mm-nitrogen8mm.dtb \
 			  imx8mm-nitrogen8mm-m4.dtb \
 			  imx8mm-nitrogen8mm_rev2.dtb \
+			  imx8mm-nitrogen8mm_rev2-lt8912.dtb \
 			  imx8mm-nitrogen8mm_rev2-m4.dtb \
 			  imx8mm-nitrogen8mm-tc358743.dtb \
 			  imx8mm-nitrogen8mm_som.dtb \

arch/arm64/boot/dts/freescale/imx8mm-nitrogen8mm_rev2-lt8912.dts

@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2018 Boundary Devices
+ */
+
+#include "imx8mm-nitrogen8mm_rev2.dts"
+
+/ {
+	model = "Boundary Devices i.MX8MMini Nitrogen8MM Rev2 with lt8912 mipi_dsi to hdmi converter";
+	compatible = "boundary,imx8mm-nitrogen8mm_rev2-lt8912" ,"boundary,imx8mm-nitrogen8mm_rev2", "fsl,imx8mm";
+
+	/delete-node/ alias_create_phandles;
+
+	aliases {
+		/delete-property/ fb_mipi;
+		/delete-property/ mipi;
+		/delete-property/ mipi_to_lvds;
+		/delete-property/ t_mipi;
+	};
+
+	soc@0 {
+		bus@30800000 {
+			i2c@30a30000 {
+				/delete-node/ mipi-to-lvds@2c;
+			};
+		};
+
+		bus@32c00000 {
+			mipi_dsi@32e10000 {
+				/delete-node/ panel@0;
+				port@1 {
+					mipi_dsi_hdmi_out: endpoint {
+						remote-endpoint = <&lt8912_1_in>;
+						attach-bridge;
+					};
+				};
+			};
+		};
+	};
+
+};
+
+&TOUCHSCREEN_I2C_BUS {
+	i2cmux9540@70 {
+		TOUCHSCREEN_I2C_BUS@1 {
+			lt8912@48 {
+				/delete-property/ display-dsi;
+			};
+		};
+	};
+};
+
+&TOUCHSCREEN_I2C_BUS {
+	i2cmux9546@70 {
+		TOUCHSCREEN_I2C_BUS@0 {
+			lt8912@48 {
+				compatible = "lontium,lt8912_drm";
+				dsi-lanes = <4>;
+				/delete-property/ display-dsi;
+				port@0 {
+					lt8912_1_in: endpoint {
+						remote-endpoint = <&mipi_dsi_hdmi_out>;
+					};
+				};
+			};
+		};
+	};
+};

arch/arm64/configs/boundary_defconfig

@@ -410,6 +410,7 @@ CONFIG_DRM_I2C_CH7006=m
 CONFIG_DRM_I2C_SIL164=m
 CONFIG_DRM_PANEL_SIMPLE=y
 CONFIG_DRM_PANEL_RAYDIUM_RM67191=y
+CONFIG_DRM_LT8912=y
 CONFIG_DRM_FSL_IMX_LVDS_BRIDGE=y
 CONFIG_DRM_SII902X=m
 CONFIG_DRM_I2C_ADV7511=y

drivers/gpu/drm/bridge/Kconfig

@@ -63,6 +63,15 @@ config DRM_LVDS_ENCODER
 	  Support for transparent parallel to LVDS encoders that don't require
 	  any configuration.
 
+config DRM_LT8912
+	tristate "Lontium LT8912 mipi_dsi to HDMI out bridge"
+	depends on OF
+	select DRM_KMS_HELPER
+	select REGMAP_I2C
+	select DRM_PANEL
+	---help---
+	  Lontium LT8912 mipi_dsi to HDMI out bridge driver.
+
 config DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW
 	tristate "MegaChips stdp4028-ge-b850v3-fw and stdp2690-ge-b850v3-fw"
 	depends on OF

drivers/gpu/drm/bridge/Makefile

@@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
 obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
 obj-$(CONFIG_DRM_FSL_IMX_LVDS_BRIDGE) += fsl-imx-ldb.o
 obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
+obj-$(CONFIG_DRM_LT8912) += lt8912.o
 obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
 obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o