[PATCH v4 06/11] arm64: dts: freescale: imx8mm-var-som: Rework WiFi/BT and add legacy dts
From: Stefano Radaelli <hidden>
Date: 2026-03-19 18:41:57
Also in:
imx, linux-devicetree, lkml
Subsystem:
arm/freescale imx / mxc arm architecture, the rest · Maintainers:
Frank Li, Sascha Hauer, Linus Torvalds
From: Stefano Radaelli <redacted> The VAR-SOM-MX8MM currently integrates the NXP IW61x wireless module, providing WiFi over SDIO and Bluetooth over UART. Move the wireless module configuration out of the base imx8mm-var-som.dtsi and provide dedicated variant includes. The IW61x configuration is moved to imx8mm-var-som-wifi-bt-iw61x.dtsi and used by the Symphony evaluation board device tree. A separate imx8mm-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 imx8mm-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. Signed-off-by: Stefano Radaelli <redacted> --- v3->v4: - Add symphony legacy dtb to use old brcm wifi module v2->v3: - v1->v2: - Added Wifi/BT dtsi variants for both iw61x and brcm legacy modules arch/arm64/boot/dts/freescale/Makefile | 1 + .../imx8mm-var-som-symphony-legacy.dts | 19 ++++++++ .../dts/freescale/imx8mm-var-som-symphony.dts | 1 + .../imx8mm-var-som-wifi-brcm-legacy.dtsi | 12 +++++ .../imx8mm-var-som-wifi-bt-iw61x.dtsi | 45 +++++++++++++++++++ .../boot/dts/freescale/imx8mm-var-som.dtsi | 6 --- 6 files changed, 78 insertions(+), 6 deletions(-) create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony-legacy.dts create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-var-som-wifi-brcm-legacy.dtsi create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-var-som-wifi-bt-iw61x.dtsi
diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index bae24b53bce6..420b434bcd3a 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile@@ -161,6 +161,7 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-tqma8mqml-mba8mx.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-tx8m-1610-moduline-iv-306-d.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-tx8m-1610-moduline-mini-111.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-var-som-symphony.dtb +dtb-$(CONFIG_ARCH_MXC) += imx8mm-var-som-symphony-legacy.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw71xx-0x.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw72xx-0x.dtb dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x.dtb
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony-legacy.dts b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony-legacy.dts
new file mode 100644
index 000000000000..faa707402de9
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony-legacy.dts@@ -0,0 +1,19 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) +/* + * Copyright 2026 Variscite Ltd. + */ + +#include "imx8mm-var-som-symphony.dts" +#include "imx8mm-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/imx8mm-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts
index 9f4e004f0a37..2b608470da8e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts@@ -7,6 +7,7 @@ #include <dt-bindings/leds/common.h> #include "imx8mm-var-som.dtsi" +#include "imx8mm-var-som-wifi-bt-iw61x.dtsi" / { model = "Variscite VAR-SOM-MX8MM Symphony evaluation board";
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som-wifi-brcm-legacy.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-var-som-wifi-brcm-legacy.dtsi
new file mode 100644
index 000000000000..f44a846ea6f9
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-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@1 { + reg = <1>; + compatible = "brcm,bcm4329-fmac"; + }; +};
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som-wifi-bt-iw61x.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-var-som-wifi-bt-iw61x.dtsi
new file mode 100644
index 000000000000..15990d141d2a
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-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 = < + MX8MM_IOMUXC_SD1_DATA4_GPIO2_IO6 0xc1 + >; + }; + + pinctrl_wifi: wifigrp { + fsl,pins = < + MX8MM_IOMUXC_SD2_WP_GPIO2_IO20 0x140 + MX8MM_IOMUXC_SD1_RESET_B_GPIO2_IO10 0xc1 + >; + }; +};
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
index 21a4d87c0e26..c37badc4cf27 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-var-som.dtsi@@ -390,7 +390,6 @@ &usbotg2 { status = "okay"; }; -/* WIFI */ &usdhc1 { #address-cells = <1>; #size-cells = <0>;
@@ -402,11 +401,6 @@ &usdhc1 { non-removable; keep-power-in-suspend; status = "okay"; - - brcmf: wifi@1 { - reg = <1>; - compatible = "brcm,bcm4329-fmac"; - }; }; /* SD */
--
2.47.3