Add DT bindings to describe the rpm/rpmh power domains found on Qualcomm
Technologies, Inc. SoCs. These power domains communicate a performance
state to RPM/RPMh, which then translates it into corresponding voltage on a
PMIC rail.

Signed-off-by: Rajendra Nayak <redacted>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Ulf Hansson <redacted>
---
 .../devicetree/bindings/power/qcom,rpmpd.txt  | 146 ++++++++++++++++++
 include/dt-bindings/power/qcom-rpmpd.h        |  39 +++++
 2 files changed, 185 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/qcom,rpmpd.txt
 create mode 100644 include/dt-bindings/power/qcom-rpmpd.h

diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
new file mode 100644
index 000000000000..8825080afa5a
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt

@@ -0,0 +1,146 @@
+Qualcomm RPM/RPMh Power domains
+
+For RPM/RPMh Power domains, we communicate a performance state to RPM/RPMh
+which then translates it into a corresponding voltage on a rail
+
+Required Properties:
+ - compatible: Should be one of the following
+	* qcom,msm8996-rpmpd: RPM Power domain for the msm8996 family of SoC
+	* qcom,sdm845-rpmhpd: RPMh Power domain for the sdm845 family of SoC
+ - power-domain-cells: number of cells in Power domain specifier
+	must be 1.
+ - operating-points-v2: Phandle to the OPP table for the Power domain.
+	Refer to Documentation/devicetree/bindings/power/power_domain.txt
+	and Documentation/devicetree/bindings/opp/qcom-opp.txt for more details
+
+Refer to <dt-bindings/power/qcom-rpmpd.h> for the level values for
+various OPPs for different platforms as well as Power domain indexes
+
+Example: rpmh power domain controller and OPP table
+
+#include <dt-bindings/power/qcom-rpmhpd.h>
+
+qcom,level values specified in the OPP tables for RPMh power domains
+should use the RPMH_REGULATOR_LEVEL_* constants from
+<dt-bindings/power/qcom-rpmhpd.h>
+
+	rpmhpd: power-controller {
+		compatible = "qcom,sdm845-rpmhpd";
+		#power-domain-cells = <1>;
+		operating-points-v2 = <&rpmhpd_opp_table>;
+	};
+
+	rpmhpd_opp_table: opp-table {
+		compatible = "operating-points-v2-qcom-level";
+
+		rpmhpd_opp_ret: opp1 {
+			qcom,level = <RPMH_REGULATOR_LEVEL_RETENTION>;
+		};