From: David Heidelberg <david@ixit.cz>

The onboard Wi-Fi / BT device, WCN3990, has a simple on-chip PMU, which
further spreads generated voltage. Describe the PMU in the device tree
and rewire Bluetooth and Wi-Fi supply properties to use the PMU LDO
outputs instead of referencing the SoC regulators directly.

Couldn't verify the swctrl GPIO thus omitted.

Assisted-by: Claude:claude-opus-4.6
Signed-off-by: David Heidelberg <david@ixit.cz>
---
 arch/arm64/boot/dts/qcom/sdm845-google-common.dtsi | 42 ++++++++++++++++++----
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-google-common.dtsi b/arch/arm64/boot/dts/qcom/sdm845-google-common.dtsi
index fd9788d5c3f54..6930066857768 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-google-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845-google-common.dtsi
@@ -131,6 +131,33 @@ vreg_s4a_1p8: regulator-vreg-s4a-1p8 {
 
 		vin-supply = <&vph_pwr>;
 	};
+
+	wcn3990-pmu {
+		compatible = "qcom,wcn3990-pmu";
+
+		vddio-supply = <&vreg_s4a_1p8>;
+		vddxo-supply = <&vreg_l7a_1p8>;
+		vddrf-supply = <&vreg_l17a_1p3>;
+		vddch0-supply = <&vreg_l25a_3p3>;
+
+		regulators {
+			vreg_pmu_io: ldo0 {
+				regulator-name = "vreg_pmu_io";
+			};
+
+			vreg_pmu_xo: ldo1 {
+				regulator-name = "vreg_pmu_xo";
+			};
+
+			vreg_pmu_rf: ldo2 {
+				regulator-name = "vreg_pmu_rf";
+			};
+
+			vreg_pmu_ch0: ldo3 {
+				regulator-name = "vreg_pmu_ch0";
+			};
+		};
+	};
 };
 
 &adsp_pas {
@@ -462,10 +489,11 @@ &uart6 {
 	bluetooth {
 		compatible = "qcom,wcn3990-bt";
 
-		vddio-supply = <&vreg_s4a_1p8>;
-		vddxo-supply = <&vreg_l7a_1p8>;
-		vddrf-supply = <&vreg_l17a_1p3>;
-		vddch0-supply = <&vreg_l25a_3p3>;
+		vddio-supply = <&vreg_pmu_io>;
+		vddxo-supply = <&vreg_pmu_xo>;
+		vddrf-supply = <&vreg_pmu_rf>;
+		vddch0-supply = <&vreg_pmu_ch0>;
+
 		max-speed = <3200000>;
 	};
 };
@@ -526,9 +554,9 @@ &venus {
 
 &wifi {
 	vdd-0.8-cx-mx-supply = <&vreg_l5a_0p8>;
-	vdd-1.8-xo-supply = <&vreg_l7a_1p8>;
-	vdd-1.3-rfa-supply = <&vreg_l17a_1p3>;
-	vdd-3.3-ch0-supply = <&vreg_l25a_3p3>;
+	vdd-1.8-xo-supply = <&vreg_pmu_xo>;
+	vdd-1.3-rfa-supply = <&vreg_pmu_rf>;
+	vdd-3.3-ch0-supply = <&vreg_pmu_ch0>;
 
 	qcom,snoc-host-cap-8bit-quirk;
 

-- 
2.53.0

On Fri, Mar 27, 2026 at 02:07:08PM +0100, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@ixit.cz>
> 
> The onboard Wi-Fi / BT device, WCN3990, has a simple on-chip PMU, which
> further spreads generated voltage. Describe the PMU in the device tree
> and rewire Bluetooth and Wi-Fi supply properties to use the PMU LDO
> outputs instead of referencing the SoC regulators directly.
> 
> Couldn't verify the swctrl GPIO thus omitted.
> 
> Assisted-by: Claude:claude-opus-4.6
> Signed-off-by: David Heidelberg <david@ixit.cz>
> ---
>  arch/arm64/boot/dts/qcom/sdm845-google-common.dtsi | 42 ++++++++++++++++++----
>  1 file changed, 35 insertions(+), 7 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>


-- 
With best wishes
Dmitry