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Message-Id: <20260118-imx8mp-hb-iiot-v7-6-ef1176119a8e@solid-run.com>
Date: Sun, 18 Jan 2026 14:51:43 +0200
From: Josua Mayer <josua@...id-run.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>
Cc: Mikhail Anikin <mikhail.anikin@...id-run.com>,
Yazan Shhady <yazan.shhady@...id-run.com>, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
linux-arm-kernel@...ts.infradead.org, Josua Mayer <josua@...id-run.com>
Subject: [PATCH v7 6/8] arm64: dts: imx8mp-hummingboard-iiot: add dt
overlays for muxable ports
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@...id-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@...id-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 = <®_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@...id-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 = <®_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@...id-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@...id-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
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