ARM: dts: qcom: Add XO calibration trigger support for tuna

WLAN has a requirement to trigger a PBS sequence for XO calibration
for factory testing. To support this, expose a new register under
PMK8550 SDAM2 for clients to write input data into and a new PBS
regulator on which clients can vote to trigger the PBS sequence.

Change-Id: Ia314c8cba7a6205943b99e7530990ea6dde8b09c
Signed-off-by: Kamal Wadhwa <quic_kamalw@quicinc.com>

qcom/tuna-regulators.dtsi

@@ -1367,4 +1367,15 @@
 			qcom,init-voltage = <3304000>;
 		};
 	};
+
+	rpmh-regulator-vrm-wcal {
+		compatible = "qcom,rpmh-pbs-regulator";
+		qcom,resource-name = "vrm.wcal";
+
+		WCAL_PBS:
+		pmk8550_wcal_pbs: regulator-pmk8550-wcal-pbs {
+			regulator-name = "pmk8550_wcal_pbs";
+			qcom,set = <RPMH_REGULATOR_SET_ALL>;
+		};
+	};
 };