[PATCH v3] arm64: dts: qcom: arduino-monza: add WLAN enable and rfkill GPIO

[PATCH v3] arm64: dts: qcom: arduino-monza: add WLAN enable and rfkill GPIO

[Qian Zhang via B4 Relay]

From: Qian Zhang <qian.zhang@oss.qualcomm.com>

The QCNFA765 M.2 PCIe WLAN module requires GPIO56 (wlan_en) to be
asserted before PCIe enumeration, and GPIO54 to control the RF kill
line.

Model GPIO56 as a regulator-fixed node (wlan_en) referenced from the
PCIe node via vddpe-3v3-supply to ensure correct power sequencing.
Model GPIO54 as a rfkill-gpio node to allow the rfkill subsystem to
manage RF state.

Signed-off-by: Qian Zhang <qian.zhang@oss.qualcomm.com>
---
The Arduino VENTUNO Q board uses a QCNFA765 M.2 PCIe WLAN module
connected to PCIe0. Two GPIOs are required for proper WLAN operation:

- GPIO56 (wlan_en): The WLAN module enable line. It must be asserted
  before PCIe enumeration begins, otherwise the module is not detected
  by the PCIe root complex. This is modeled as a regulator-fixed node
  (wlan_en) referenced from the PCIe node via vddpe-3v3-supply, which
  ensures the GPIO is asserted with a 20ms startup delay before PCIe
  enumeration starts.

- GPIO54 (rfkill): The RF kill line. It is modeled as a rfkill-gpio
  node so that the rfkill subsystem can properly manage RF state,
  including software-triggered airplane mode.

Testing:
- WLAN module (QCNFA765) successfully enumerated on PCIe after boot
- WiFi scan detects available networks
- rfkill block/unblock correctly toggles GPIO54
- GPIO56 remains high throughout rfkill block/unblock
---
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: https://lore.kernel.org/r/20260501051918.1990713-1-qian.zhang@oss.qualcomm.com
---
 arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts b/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
index ca14f0ea4dae..e0ffe87bba90 100644
--- a/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
+++ b/arch/arm64/boot/dts/qcom/monaco-arduino-monza.dts
@@ -153,6 +153,25 @@ 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>;
+	};
+
+	wlan_reg_3v3: wlan-3v3-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "wlan_en";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vdc_3v3>;
+		gpio = <&tlmm 56 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+		startup-delay-us = <20000>;
+		regulator-boot-on;
+	};
 };
 
 &ethernet0 {
@@ -326,7 +345,7 @@ &pcie0 {
 	pinctrl-0 = <&pcie0_default_state>;
 	pinctrl-names = "default";
 
-	vddpe-3v3-supply = <&vdc_3v3>;
+	vddpe-3v3-supply = <&wlan_reg_3v3>;
 };
 
 &pcie1 {

---
base-commit: e98d21c170b01ddef366f023bbfcf6b31509fa83
change-id: 20260511-linux-next-0846ad58ba18

Best regards,
-- 
Qian Zhang <qian.zhang@oss.qualcomm.com>