[PATCH v1 07/15] arm64: dts: freescale: imx8mn-var-som: Rework WiFi/BT and add legacy dts

[Stefano Radaelli]

From: Stefano Radaelli <stefano.r at variscite.com>

The VAR-SOM-MX8MN currently integrates the NXP IW61x wireless module,
providing WiFi over SDIO and Bluetooth over UART.

Move the wireless module configuration out of the base
imx8mn-var-som.dtsi and provide dedicated variant includes.
The IW61x configuration is moved to imx8mn-var-som-wifi-bt-iw61x.dtsi
and used by the Symphony evaluation board device tree.

A separate imx8mn-var-som-wifi-brcm-legacy.dtsi include is added to keep
the configuration for the legacy Broadcom SDIO WiFi module used on
earlier SOM revisions.

To preserve compatibility with older SOM revisions, add a separate
imx8mn-var-som-symphony-legacy.dtb, which disables the IW61x setup and
applies the Broadcom-specific configuration.

The Broadcom-based SOM revision is no longer in production, but support
is kept for existing users.

This keeps the VAR-SOM-MX8MN support aligned with the existing
VAR-SOM-MX8MM implementation.

Signed-off-by: Stefano Radaelli <stefano.r at variscite.com>
---
 arch/arm64/boot/dts/freescale/Makefile        |  1 +
 .../imx8mn-var-som-symphony-legacy.dts        | 19 ++++++++
 .../dts/freescale/imx8mn-var-som-symphony.dts |  1 +
 .../imx8mn-var-som-wifi-brcm-legacy.dtsi      | 12 +++++
 .../imx8mn-var-som-wifi-bt-iw61x.dtsi         | 45 +++++++++++++++++++
 .../boot/dts/freescale/imx8mn-var-som.dtsi    |  6 ---
 6 files changed, 78 insertions(+), 6 deletions(-)
 create mode 100644 arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony-legacy.dts
 create mode 100644 arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-brcm-legacy.dtsi
 create mode 100644 arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-bt-iw61x.dtsi

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 430085123b4e..bdd3818d6e79 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -206,6 +206,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mn-solidsense-n8-compact.dtb
 DTC_FLAGS_imx8mn-solidsense-n8-compact += -@
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-tqma8mqnl-mba8mx.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-var-som-symphony.dtb
+dtb-$(CONFIG_ARCH_MXC) += imx8mn-var-som-symphony-legacy.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx8mn-venice-gw7902.dtb
 
 imx8mn-vhip4-evalboard-v1-overlay-ksz8794-dtbs := imx8mn-vhip4-evalboard-v1.dtb \
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony-legacy.dts b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony-legacy.dts
new file mode 100644
index 000000000000..5998ebcef474
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony-legacy.dts
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2026 Variscite Ltd.
+ */
+
+#include "imx8mn-var-som-symphony.dts"
+#include "imx8mn-var-som-wifi-brcm-legacy.dtsi"
+
+&bluetooth_iw61x {
+	status = "disabled";
+};
+
+&iw61x_pwrseq {
+	status = "disabled";
+};
+
+&usdhc1 {
+	/delete-property/ mmc-pwrseq;
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
index 520aff23e587..53130b521b5b 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
@@ -11,6 +11,7 @@
 #include <dt-bindings/leds/common.h>
 #include <dt-bindings/usb/pd.h>
 #include "imx8mn-var-som.dtsi"
+#include "imx8mn-var-som-wifi-bt-iw61x.dtsi"
 
 / {
 	model = "Variscite VAR-SOM-MX8MN Symphony evaluation board";
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-brcm-legacy.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-brcm-legacy.dtsi
new file mode 100644
index 000000000000..f44a846ea6f9
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-brcm-legacy.dtsi
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2026 Variscite Ltd.
+ */
+
+/* WIFI */
+&usdhc1 {
+	brcmf: wifi at 1 {
+		reg = <1>;
+		compatible = "brcm,bcm4329-fmac";
+	};
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-bt-iw61x.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-bt-iw61x.dtsi
new file mode 100644
index 000000000000..cb4b282a25b0
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-wifi-bt-iw61x.dtsi
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright 2026 Variscite Ltd.
+ */
+
+/ {
+	iw61x_pwrseq: wifi-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		post-power-on-delay-ms = <100>;
+		power-off-delay-us = <10000>;
+		reset-gpios = <&gpio2 10 GPIO_ACTIVE_LOW>, /* WIFI_RESET */
+			      <&gpio2 20 GPIO_ACTIVE_LOW>; /* WIFI_PWR_EN */
+	};
+};
+
+&uart2 {
+	pinctrl-0 = <&pinctrl_uart2>, <&pinctrl_bt>;
+
+	bluetooth_iw61x: bluetooth {
+		compatible = "nxp,88w8987-bt";
+	};
+};
+
+/* WIFI */
+&usdhc1 {
+	pinctrl-0 = <&pinctrl_usdhc1>, <&pinctrl_wifi>;
+	pinctrl-1 = <&pinctrl_usdhc1_100mhz>, <&pinctrl_wifi>;
+	pinctrl-2 = <&pinctrl_usdhc1_200mhz>, <&pinctrl_wifi>;
+	mmc-pwrseq = <&iw61x_pwrseq>;
+};
+
+&iomuxc {
+	pinctrl_bt: bluetoothgrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_SD1_DATA4_GPIO2_IO6	0xc1
+		>;
+	};
+
+	pinctrl_wifi: wifigrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_SD2_WP_GPIO2_IO20		0x140
+			MX8MN_IOMUXC_SD1_RESET_B_GPIO2_IO10	0xc1
+		>;
+	};
+};
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
index ac22dd3e6542..ff5f658b33de 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
@@ -371,7 +371,6 @@ &usbotg1 {
 	status = "okay";
 };
 
-/* WIFI */
 &usdhc1 {
 	#address-cells = <1>;
 	#size-cells = <0>;
@@ -383,11 +382,6 @@ &usdhc1 {
 	non-removable;
 	keep-power-in-suspend;
 	status = "okay";
-
-	brcmf: wifi at 1 {
-		reg = <1>;
-		compatible = "brcm,bcm4329-fmac";
-	};
 };
 
 /* eMMC */
-- 
2.47.3