dt-bindings: remoteproc: qcom,wcnss: Deprecate regulators for PDs

So far we have been doing all proxy votes by voting for raw voltages/load
through the regulator interface. But actually VDDCX and VDDMX represent
power domains that should be preferably managed using corner votes
through the power domain interface.

Document that those should be specified as power domains for
qcom,pronto-v1/2-pil and deprecate using them through the regulator
interface.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Link: https://lore.kernel.org/r/20200916104135.25085-8-stephan@gerhold.net
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Documentation/devicetree/bindings/remoteproc/qcom,wcnss-pil.txt

@@ -34,14 +34,25 @@ on the Qualcomm WCNSS core.
 	Definition: should be "wdog", "fatal", optionally followed by "ready",
 		    "handover", "stop-ack"
 
-- vddmx-supply:
-- vddcx-supply:
+- vddmx-supply: (deprecated for qcom,pronto-v1/2-pil)
+- vddcx-supply: (deprecated for qcom,pronto-v1/2-pil)
 - vddpx-supply:
 	Usage: required
 	Value type: <phandle>
 	Definition: reference to the regulators to be held on behalf of the
 		    booting of the WCNSS core
 
+- power-domains:
+	Usage: required (for qcom,pronto-v1/2-pil)
+	Value type: <phandle>
+	Definition: reference to the power domains to be held on behalf of the
+		    booting of the WCNSS core
+
+- power-domain-names:
+	Usage: required (for qcom,pronto-v1/2-pil)
+	Value type: <stringlist>
+	Definition: must be "cx", "mx"
+
 - qcom,smem-states:
 	Usage: optional
 	Value type: <prop-encoded-array>
@@ -111,8 +122,9 @@ pronto@fb204000 {
 			      <&wcnss_smp2p_slave 3 0>;
 	interrupt-names = "wdog", "fatal", "ready", "handover", "stop-ack";
 
-	vddmx-supply = <&pm8841_s1>;
-	vddcx-supply = <&pm8841_s2>;
+	power-domains = <&rpmpd MSM8974_VDDCX>, <&rpmpd MSM8974_VDDMX>;
+	power-domain-names = "cx", "mx";
+
 	vddpx-supply = <&pm8941_s3>;
 
 	qcom,smem-states = <&wcnss_smp2p_out 0>;