arm64: dts: qcom: msm8996-oneplus: Add SLPI VDD_PX

The PX line powers some hardware related to sensors. Assume the board
doesn't reinvent what MTP has established and hook up LVS2 @ 1.8V as
such.

This fixes the 'is required' type of bindings validator errors.

Signed-off-by: Konrad Dybcio <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Link: https://lore.kernel.org/r/20250327-topic-more_dt_bindings_fixes-v2-10-b763d958545f@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <[email protected]>

Author: quic-kdybcio

arch/arm64/boot/dts/qcom/msm8996-oneplus-common.dtsi

@@ -492,6 +492,11 @@
 			regulator-min-microvolt = <1800000>;
 			regulator-max-microvolt = <1800000>;
 		};
+
+		vreg_lvs2a: lvs2 {
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+		};
 	};
 };
 

arch/arm64/boot/dts/qcom/msm8996-oneplus3.dts

@@ -41,6 +41,8 @@
 
 &slpi_pil {
 	firmware-name = "qcom/msm8996/oneplus3/slpi.mbn";
+	px-supply = <&vreg_lvs2a>;
+
 	status = "okay";
 };
 

arch/arm64/boot/dts/qcom/msm8996-oneplus3t.dts

@@ -42,6 +42,8 @@
 
 &slpi_pil {
 	firmware-name = "qcom/msm8996/oneplus3t/slpi.mbn";
+	px-supply = <&vreg_lvs2a>;
+
 	status = "okay";
 };