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 <rna...@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
Reviewed-by: Ulf Hansson <ulf.hans...@linaro.org>
---
 .../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>;
+               };
+
+               rpmhpd_opp_min_svs: opp2 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_MIN_SVS>;
+               };
+
+               rpmhpd_opp_low_svs: opp3 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_LOW_SVS>;
+               };
+
+               rpmhpd_opp_svs: opp4 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_SVS>;
+               };
+
+               rpmhpd_opp_svs_l1: opp5 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_SVS_L1>;
+               };
+
+               rpmhpd_opp_nom: opp6 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_NOM>;
+               };
+
+               rpmhpd_opp_nom_l1: opp7 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_NOM_L1>;
+               };
+
+               rpmhpd_opp_nom_l2: opp8 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_NOM_L2>;
+               };
+
+               rpmhpd_opp_turbo: opp9 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_TURBO>;
+               };
+
+               rpmhpd_opp_turbo_l1: opp10 {
+                       qcom,level = <RPMH_REGULATOR_LEVEL_TURBO_L1>;
+               };
+       };
+
+Example: rpm power domain controller and OPP table
+
+       rpmpd: power-controller {
+               compatible = "qcom,msm8996-rpmpd";
+               #power-domain-cells = <1>;
+               operating-points-v2 = <&rpmpd_opp_table>;
+       };
+
+       rpmpd_opp_table: opp-table {
+               compatible = "operating-points-v2-qcom-level";
+
+               rpmpd_opp_low: opp1 {
+                       qcom,level = <1>;
+               };
+
+               rpmpd_opp_ret: opp2 {
+                       qcom,level = <2>;
+               };
+
+               rpmpd_opp_svs: opp3 {
+                       qcom,level = <3>;
+               };
+
+               rpmpd_opp_normal: opp4 {
+                       qcom,level = <4>;
+               };
+
+               rpmpd_opp_high: opp5 {
+                       qcom,level = <5>;
+               };
+
+               rpmpd_opp_turbo: opp6 {
+                       qcom,level = <6>;
+               };
+       };
+
+Example: Client/Consumer device using OPP table
+
+       leaky-device0@12350000 {
+               compatible = "foo,i-leak-current";
+               reg = <0x12350000 0x1000>;
+               power-domains = <&rpmhpd SDM845_MX>;
+               operating-points-v2 = <&leaky_opp_table>;
+       };
+
+
+       leaky_opp_table: opp-table {
+               compatible = "operating-points-v2";
+
+               opp1 {
+                       opp-hz = /bits/ 64 <144000>;
+                       required-opps = <&rpmhpd_opp_low>;
+               };
+
+               opp2 {
+                       opp-hz = /bits/ 64 <400000>;
+                       required-opps = <&rpmhpd_opp_ret>;
+               };
+
+               opp3 {
+                       opp-hz = /bits/ 64 <20000000>;
+                       required-opps = <&rpmpd_opp_svs>;
+               };
+
+               opp4 {
+                       opp-hz = /bits/ 64 <25000000>;
+                       required-opps = <&rpmpd_opp_normal>;
+               };
+
+       };
diff --git a/include/dt-bindings/power/qcom-rpmpd.h 
b/include/dt-bindings/power/qcom-rpmpd.h
new file mode 100644
index 000000000000..87d9c6611682
--- /dev/null
+++ b/include/dt-bindings/power/qcom-rpmpd.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2018, The Linux Foundation. All rights reserved. */
+
+#ifndef _DT_BINDINGS_POWER_QCOM_RPMPD_H
+#define _DT_BINDINGS_POWER_QCOM_RPMPD_H
+
+/* SDM845 Power Domain Indexes */
+#define SDM845_EBI     0
+#define SDM845_MX      1
+#define SDM845_MX_AO   2
+#define SDM845_CX      3
+#define SDM845_CX_AO   4
+#define SDM845_LMX     5
+#define SDM845_LCX     6
+#define SDM845_GFX     7
+#define SDM845_MSS     8
+
+/* SDM845 Power Domain performance levels */
+#define RPMH_REGULATOR_LEVEL_RETENTION 16
+#define RPMH_REGULATOR_LEVEL_MIN_SVS   48
+#define RPMH_REGULATOR_LEVEL_LOW_SVS   64
+#define RPMH_REGULATOR_LEVEL_SVS       128
+#define RPMH_REGULATOR_LEVEL_SVS_L1    192
+#define RPMH_REGULATOR_LEVEL_NOM       256
+#define RPMH_REGULATOR_LEVEL_NOM_L1    320
+#define RPMH_REGULATOR_LEVEL_NOM_L2    336
+#define RPMH_REGULATOR_LEVEL_TURBO     384
+#define RPMH_REGULATOR_LEVEL_TURBO_L1  416
+
+/* MSM8996 Power Domain Indexes */
+#define MSM8996_VDDCX          0
+#define MSM8996_VDDCX_AO       1
+#define MSM8996_VDDCX_VFC      2
+#define MSM8996_VDDMX          3
+#define MSM8996_VDDMX_AO       4
+#define MSM8996_VDDSSCX                5
+#define MSM8996_VDDSSCX_VFC    6
+
+#endif
-- 
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