[PATCH v7 6/8] arm64: dts: imx8mp-hummingboard-iiot: add dt overlays for muxable ports

[Josua Mayer <josua@solid-run.com>]

The SolidRun i.MX8MP HummingBoard IIoT has a variety of conectors, and
configurable ports:

- 2x RS232
- 2x RS485
- DSI Panel Connector
- LVDS Panel Connector

RS232 and RS485 each share a single UART from the SoC via a mux, which
are configured from the base dts for RS232 by default.

Provide addons for:

1. Reconfigure UART A from RS232 to RS485.
2. Reconfigure UART B from RS232 to RS485.
3. Configure DSI Connector for Winstar WJ70N3TYJHMNG0 Panel.
4. Configure LVDS Connector for Winstar WF70A8SYJHLNGA Panel.

A variation of the base dtb is generated for each addon to ensure that
make dtbs_check covers the resulting dtb, and applying overlay is
tested during build.

It is however expected that bootloader should apply any combination of
addons based on runtime configuration.

Signed-off-by: Josua Mayer <josua@solid-run.com>
---
 arch/arm64/boot/dts/freescale/Makefile             |  12 +++
 ...hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso |  69 ++++++++++++++
 ...ummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtso | 105 +++++++++++++++++++++
 .../imx8mp-hummingboard-iiot-rs485-a.dtso          |  18 ++++
 .../imx8mp-hummingboard-iiot-rs485-b.dtso          |  18 ++++
 5 files changed, 222 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 80fb5bf084b3..0027b29b4c35 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -215,6 +215,18 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-edm-g-wb.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-evk.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot.dtb
 DTC_FLAGS_imx8mp-hummingboard-iiot := -@
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtbo
+imx8mp-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0-dtbs += imx8mp-hummingboard-iiot.dtb imx8mp-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtbo
+imx8mp-hummingboard-iiot-panel-lvds-WF70A8SYJHLNGA-dtbs += imx8mp-hummingboard-iiot.dtb imx8mp-hummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-rs485-a.dtbo
+imx8mp-hummingboard-iiot-rs485-a-dtbs += imx8mp-hummingboard-iiot.dtb imx8mp-hummingboard-iiot-rs485-a.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-rs485-a.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-rs485-b.dtbo
+imx8mp-hummingboard-iiot-rs485-b-dtbs += imx8mp-hummingboard-iiot.dtb imx8mp-hummingboard-iiot-rs485-b.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-iiot-rs485-b.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-mate.dtb
 DTC_FLAGS_imx8mp-hummingboard-mate := -@
 dtb-$(CONFIG_ARCH_MXC) += imx8mp-hummingboard-pro.dtb
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso
new file mode 100644
index 000000000000..e66ee2ce69d8
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2025 Josua Mayer <josua@solid-run.com>
+ *
+ * Overlay for enabling HummingBoard IIoT MIPI-DSI connector
+ * with Winstar WJ70N3TYJHMNG0 panel.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+&{/} {
+	dsi_backlight: dsi-backlight {
+		compatible = "gpio-backlight";
+		gpios = <&tca6408_u48 3 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&i2c_dsi {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	touchscreen@41 {
+		compatible = "ilitek,ili2130";
+		reg = <0x41>;
+		reset-gpios = <&tca6408_u48 6 GPIO_ACTIVE_LOW>;
+		interrupts-extended = <&tca6416_u21 13 IRQ_TYPE_LEVEL_LOW>;
+	};
+};
+
+&lcdif1 {
+	status = "okay";
+};
+
+&mipi_dsi {
+	samsung,esc-clock-frequency = <10000000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	panel@0 {
+		/* This is a Winstar panel, but the ronbo panel uses same controls. */
+		compatible = "ronbo,rb070d30";
+		reg = <0>;
+		vcc-lcd-supply = <&reg_dsi_panel>;
+		power-gpios = <&tca6408_u48 2 GPIO_ACTIVE_HIGH>;
+		/* reset is active-low but driver inverts it internally */
+		reset-gpios = <&tca6408_u48 1 GPIO_ACTIVE_HIGH>;
+		updn-gpios = <&tca6408_u48 5 GPIO_ACTIVE_HIGH>;
+		shlr-gpios = <&tca6408_u48 4 GPIO_ACTIVE_LOW>;
+		backlight = <&dsi_backlight>;
+
+		port {
+			panel_from_dsim: endpoint {
+				remote-endpoint = <&dsim_to_panel>;
+			};
+		};
+	};
+
+	port@1 {
+		dsim_to_panel: endpoint {
+			remote-endpoint = <&panel_from_dsim>;
+			data-lanes = <1 2 3 4>;
+		};
+	};
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtso b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtso
new file mode 100644
index 000000000000..f8fb7fd0e4e4
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtso
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2025 Josua Mayer <josua@solid-run.com>
+ *
+ * Overlay for enabling HummingBoard IIoT LVDS connector
+ * with Winstar WF70A8SYJHLNGA panel.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+&{/} {
+	lvds_backlight: lvds-backlight {
+		compatible = "gpio-backlight";
+		gpios = <&tca6408_u37 3 GPIO_ACTIVE_LOW>;
+	};
+
+	panel-lvds {
+		compatible = "winstar,wf70a8syjhlnga", "panel-lvds";
+		backlight = <&lvds_backlight>;
+		power-supply = <&reg_dsi_panel>;
+		enable-gpios = <&tca6408_u37 2 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&tca6408_u37 1 GPIO_ACTIVE_HIGH>;
+		data-mapping = "vesa-24";
+		width-mm = <154>;
+		height-mm = <86>;
+
+		panel-timing {
+			/*
+			 * Note: NXP BSP hard-codes 74MHz clock in ldb driver:
+			 * drivers/gpu/drm/imx/imx8mp-ldb.c
+			 * SolidRun BSP carries patch.
+			 */
+			clock-frequency = <49500000>;
+			hactive = <1024>;
+			vactive = <600>;
+			hfront-porch = <40>;
+			hback-porch = <144>;
+			hsync-len = <104>;
+			hsync-active = <0>;
+			vfront-porch = <3>;
+			vback-porch = <11>;
+			vsync-len = <10>;
+			vsync-active = <1>;
+			de-active = <1>;
+		};
+
+		port {
+			panel_from_lvds: endpoint {
+				remote-endpoint = <&lvds_ch0_out>;
+			};
+		};
+	};
+};
+
+&i2c_lvds {
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	touchscreen@41 {
+		compatible = "ilitek,ili2130";
+		reg = <0x41>;
+		reset-gpios = <&tca6408_u37 6 GPIO_ACTIVE_LOW>;
+		interrupts-extended = <&tca6416_u21 13 IRQ_TYPE_LEVEL_LOW>;
+	};
+};
+
+&lcdif2 {
+	status = "okay";
+};
+
+&lvds_bridge {
+	status = "okay";
+
+	ports {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		status = "okay";
+
+		port@1 {
+			lvds_ch0_out: endpoint {
+				remote-endpoint = <&panel_from_lvds>;
+			};
+		};
+	};
+};
+
+&tca6408_u37 {
+	lvds-lr-hog {
+		gpio-hog;
+		gpios = <4 GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "lvds-l/r";
+	};
+
+	lvds-ud-hog {
+		gpio-hog;
+		gpios = <5 GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "lvds-u/d";
+	};
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-rs485-a.dtso b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-rs485-a.dtso
new file mode 100644
index 000000000000..7bbf800b78fb
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-rs485-a.dtso
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2025 Josua Mayer <josua@solid-run.com>
+ *
+ * Overlay for enabling HummingBoard IIoT on-board RS485 Port A on connector J5004.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&uart3_rs_232_485_mux {
+	/* select rs485 */
+	idle-state = <1>;
+};
+
+&uart3 {
+	linux,rs485-enabled-at-boot-time;
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-rs485-b.dtso b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-rs485-b.dtso
new file mode 100644
index 000000000000..d4bfea886ad1
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot-rs485-b.dtso
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2025 Josua Mayer <josua@solid-run.com>
+ *
+ * Overlay for enabling HummingBoard IIoT on-board RS485 Port B on connector J5004.
+ */
+
+/dts-v1/;
+/plugin/;
+
+&uart4_rs_232_485_mux {
+	/* select rs485 */
+	idle-state = <1>;
+};
+
+&uart4 {
+	linux,rs485-enabled-at-boot-time;
+};

-- 
2.43.0