[PATCH v4] arm64: dts: qcom: monaco-arduino-monza: Add QCNFA725B WiFi support

[Qian Zhang]

Add support for the QCNFA725B M.2 WiFi module (WCN6855-based) connected
to PCIe0 on the Arduino VENTUNO Q board. The following DT nodes are
required:

- qcom,wcn6855-pmu: manages GPIO56 (wlan_en) through the
  pwrseq-qcom-wcn power sequencer, and exposes the WCN6855 internal
  LDO regulators consumed by the wifi@0 node.

- rfkill-gpio: exposes GPIO54 to the rfkill subsystem for RF state
  management.

- wifi@0: describes the WCN6855 endpoint on the PCI tree.

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

The Arduino VENTUNO Q board uses a QCNFA725B M.2 PCIe WLAN module
connected to PCIe0. Two GPIOs are required for proper WLAN operation:

- GPIO56 (wlan_en): The WLAN module enable line
- GPIO54 (rfkill): The RF kill line

Testing:
- WLAN module (QCNFA725B) successfully enumerated on PCIe after boot
- WiFi scan detects available networks
- rfkill block/unblock correctly toggles GPIO54

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@xxxxxxxxxxxxxxxx/

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@xxxxxxxxxxxxxxxx/

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@xxxxxxxxxxxxxxxx/

diff --git a/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts b/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
index ca14f0ea4dae..bd5b8a161e7f 100644
--- a/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
+++ b/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
@@ -153,6 +153,78 @@ vreg_nvme: regulator-3p3-m2 {
 		enable-active-high;
 		startup-delay-us = <20000>;
 	};
+
+	rfkill-wlan {
+		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 {
@@ -347,6 +419,29 @@ 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>;
@@ -448,6 +543,19 @@ 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