Add support for the QCNFA725B M.2 module (WCN6855-based)
connected to PCIe0 on the Arduino VENTUNO Q board:
- GPIO54 is the W_DISABLE# line on the M.2 connector.
  Pulling it low disables the radio transmitter at the hardware
  level. It is modeled as rfkill-gpio so the kernel rfkill subsystem
  can assert it in response to airplane mode or a hardware kill
  switch, keeping RF state consistent across suspend/resume.
- GPIO56 is wlan_en.
- QCNFA725B provides only a single external 3.3V supply input.
  Lower voltage rails (e.g. 0.9V, 1.3V and 1.9V) are generated
  internally by the integrated PMCA6850 PMIC and are not exposed
  as seperately controllable external supplies.

Signed-off-by: Qian Zhang <qian.zhang@oss.qualcomm.com>
---
 .../boot/dts/qcom/monaco-arduino-monza.dts    | 108 ++++++++++++++++++
 1 file changed, 108 insertions(+)

Changes in v5:
- Rename rfkill-wlan to wlan-rfkill.
- Refine commit message
- Link to v4: https://lore.kernel.org/all/20260531071409.3557734-1-qian.zhang@oss.qualcomm.com/

Changes in v4:
- Replace regulator-fixed + vddpe-3v3-supply with qcom,wcn6855-pmu for
  GPIO56 (wlan_en) power sequencing
- Fix module name QCNFA765 -> QCNFA725B
- Link to v3: https://lore.kernel.org/all/20260511-linux-next-v3-1-3e22737e71eb@oss.qualcomm.com/

Changes in v3:
- Replace regulator-fixed with rfkill-gpio for GPIO54 (rfkill)
- Reference wlan_en from PCIe node via vddpe-3v3-supply
- Fix subject prefix
- Link to v2 (wrongly named v1): https://lore.kernel.org/all/20260501051918.1990713-1-qian.zhang@oss.qualcomm.com/

Changes in v2:
- Clarified GPIO roles: GPIO54 for wlan_rf_kill, GPIO56 for wlan_en
- Improved commit message readability with bullet list format
- Link to v1 (wrongly named v0): https://lore.kernel.org/all/20260425031712.3800662-1-qian.zhang@oss.qualcomm.com/

diff --git a/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts b/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
index 379b796f261f..c4011ad51074 100644
--- a/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
+++ b/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
@@ -154,6 +154,78 @@ vreg_nvme: regulator-3p3-m2 {
 		enable-active-high;
 		startup-delay-us = <20000>;
 	};
+
+	wlan-rfkill {
+		compatible = "rfkill-gpio";
+		label = "wlan";
+		radio-type = "wlan";
+		shutdown-gpios = <&tlmm 54 GPIO_ACTIVE_HIGH>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&wlrfkill_default_state>;
+	};
+
+	wcn6855-pmu {
+		compatible = "qcom,wcn6855-pmu";
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&wlan_en_state>;
+
+		wlan-enable-gpios = <&tlmm 56 GPIO_ACTIVE_HIGH>;
+
+		vddio-supply    = <&vdc_3v3>;
+		vddaon-supply   = <&vdc_3v3>;
+		vddpmu-supply   = <&vdc_3v3>;
+		vddpmumx-supply = <&vdc_3v3>;
+		vddpmucx-supply = <&vdc_3v3>;
+		vddrfa0p95-supply  = <&vdc_3v3>;
+		vddrfa1p3-supply   = <&vdc_3v3>;
+		vddrfa1p9-supply   = <&vdc_3v3>;
+		vddpcie1p3-supply  = <&vdc_3v3>;
+		vddpcie1p9-supply  = <&vdc_3v3>;
+
+		regulators {
+			vreg_pmu_rfa_cmn: ldo0 {
+				regulator-name = "vreg_pmu_rfa_cmn";
+			};
+
+			vreg_pmu_aon_0p59: ldo1 {
+				regulator-name = "vreg_pmu_aon_0p59";
+			};
+
+			vreg_pmu_wlcx_0p8: ldo2 {
+				regulator-name = "vreg_pmu_wlcx_0p8";
+			};
+
+			vreg_pmu_wlmx_0p85: ldo3 {
+				regulator-name = "vreg_pmu_wlmx_0p85";
+			};
+
+			vreg_pmu_btcmx_0p85: ldo4 {
+				regulator-name = "vreg_pmu_btcmx_0p85";
+			};
+
+			vreg_pmu_rfa_0p8: ldo5 {
+				regulator-name = "vreg_pmu_rfa_0p8";
+			};
+
+			vreg_pmu_rfa_1p2: ldo6 {
+				regulator-name = "vreg_pmu_rfa_1p2";
+			};
+
+			vreg_pmu_rfa_1p8: ldo7 {
+				regulator-name = "vreg_pmu_rfa_1p8";
+			};
+
+			vreg_pmu_pcie_0p9: ldo8 {
+				regulator-name = "vreg_pmu_pcie_0p9";
+			};
+
+			vreg_pmu_pcie_1p8: ldo9 {
+				regulator-name = "vreg_pmu_pcie_1p8";
+			};
+		};
+	};
 };
 
 &ethernet0 {
@@ -348,6 +420,29 @@ pci@0,0 {
 		ranges;
 		reg = <0x010000 0x00 0x00 0x00 0x00>;
 
+		pci@1,0 {
+			#address-cells = <3>;
+			#size-cells = <2>;
+			device_type = "pci";
+			ranges;
+			reg = <0x20800 0x00 0x00 0x00 0x00>;
+
+			wifi@0 {
+				compatible = "pci17cb,1103";
+				reg = <0 0 0 0 0>;
+
+				vddrfacmn-supply = <&vreg_pmu_rfa_cmn>;
+				vddaon-supply = <&vreg_pmu_aon_0p59>;
+				vddwlcx-supply = <&vreg_pmu_wlcx_0p8>;
+				vddwlmx-supply = <&vreg_pmu_wlmx_0p85>;
+				vddrfa0p8-supply = <&vreg_pmu_rfa_0p8>;
+				vddrfa1p2-supply = <&vreg_pmu_rfa_1p2>;
+				vddrfa1p8-supply = <&vreg_pmu_rfa_1p8>;
+				vddpcie0p9-supply = <&vreg_pmu_pcie_0p9>;
+				vddpcie1p8-supply = <&vreg_pmu_pcie_1p8>;
+			};
+		};
+
 		pci@2,0 {
 			#address-cells = <3>;
 			#size-cells = <2>;
@@ -449,6 +544,19 @@ adv7535_default: adv7535-default-state {
 		function = "gpio";
 		bias-pull-up;
 	};
+
+	wlrfkill_default_state: wlrfkill-default-state {
+		pins = "gpio54";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-pull-up;
+	};
+
+	wlan_en_state: wlan-en-state {
+		pins = "gpio56";
+		function = "gpio";
+		output-low;
+	};
 };
 
 &uart7 {
-- 
2.34.1

Hi Qian,

On Wed, Jun 3, 2026 at 4:00 AM Qian Zhang <qian.zhang@oss.qualcomm.com> wrote:
>
> Add support for the QCNFA725B M.2 module (WCN6855-based)
> connected to PCIe0 on the Arduino VENTUNO Q board:

This overlaps with another series that relies on the pwrseq-pcie-m2
and M.2 connector bindings for Wifi/Bluetooth:
https://lore.kernel.org/all/20260520-monza-wireless-v1-0-9f6942310653@oss.qualcomm.com/

Now that this connector is available, I think we should use it for
this kind of module.

Regards,
Loic