Qualcomm Resource Power Manager (RPM) over SMD

This driver is used to interface with the Resource Power Manager (RPM) found in
various Qualcomm platforms. The RPM allows each component in the system to vote
for state of the system resources, such as clocks, regulators and bus
frequencies.

- compatible:
	Usage: required
	Value type: <string>
	Definition: must be one of:
		    "qcom,rpm-msm8974"

- qcom,smd-channels:
	Usage: required
	Value type: <stringlist>
	Definition: Shared Memory channel used for communication with the RPM

= SUBDEVICES

The RPM exposes resources to its subnodes. The below bindings specify the set
of valid subnodes that can operate on these resources.

== Regulators

Regulator nodes are identified by their compatible:

- compatible:
	Usage: required
	Value type: <string>
	Definition: must be one of:
		    "qcom,rpm-pm8841-regulators"
		    "qcom,rpm-pm8941-regulators"

- vdd_s1-supply:
- vdd_s2-supply:
- vdd_s3-supply:
- vdd_s4-supply:
- vdd_s5-supply:
- vdd_s6-supply:
- vdd_s7-supply:
- vdd_s8-supply:
	Usage: optional (pm8841 only)
	Value type: <phandle>
	Definition: reference to regulator supplying the input pin, as
		    described in the data sheet

- vdd_s1-supply:
- vdd_s2-supply:
- vdd_s3-supply:
- vdd_l1_l3-supply:
- vdd_l2_lvs1_2_3-supply:
- vdd_l4_l11-supply:
- vdd_l5_l7-supply:
- vdd_l6_l12_l14_l15-supply:
- vdd_l8_l16_l18_l19-supply:
- vdd_l9_l10_l17_l22-supply:
- vdd_l13_l20_l23_l24-supply:
- vdd_l21-supply:
- vin_5vs-supply:
	Usage: optional (pm8941 only)
	Value type: <phandle>
	Definition: reference to regulator supplying the input pin, as
		    described in the data sheet

The regulator node houses sub-nodes for each regulator within the device. Each
sub-node is identified using the node's name, with valid values listed for each
of the pmics below.

pm8841:
	s1, s2, s3, s4, s5, s6, s7, s8

pm8941:
	s1, s2, s3, s4, l1, l2, l3, l4, l5, l6, l7, l8, l9, l10, l11, l12, l13,
	l14, l15, l16, l17, l18, l19, l20, l21, l22, l23, l24, lvs1, lvs2,
	lvs3, 5vs1, 5vs2

The content of each sub-node is defined by the standard binding for regulators -
see regulator.txt.

= EXAMPLE

	smd {
		compatible = "qcom,smd";

		rpm {
			interrupts = <0 168 1>;
			qcom,ipc = <&apcs 8 0>;
			qcom,smd-edge = <15>;

			rpm_requests {
				compatible = "qcom,rpm-msm8974";
				qcom,smd-channels = "rpm_requests";

				pm8941-regulators {
					compatible = "qcom,rpm-pm8941-regulators";
					vdd_l13_l20_l23_l24-supply = <&pm8941_boost>;

					pm8941_s3: s3 {
						regulator-min-microvolt = <1800000>;
						regulator-max-microvolt = <1800000>;
					};

					pm8941_boost: s4 {
						regulator-min-microvolt = <5000000>;
						regulator-max-microvolt = <5000000>;
					};

					pm8941_l20: l20 {
						regulator-min-microvolt = <2950000>;
						regulator-max-microvolt = <2950000>;
					};
				};
			};
		};
	};