linux-arkmicro/linux/Documentation/devicetree/bindings/regulator/qcom,rpmh-regulator.txt

Qualcomm Technologies, Inc. RPMh Regulators

rpmh-regulator devices support PMIC regulator management via the Voltage
Regulator Manager (VRM) and Oscillator Buffer (XOB) RPMh accelerators.  The APPS
processor communicates with these hardware blocks via a Resource State
Coordinator (RSC) using command packets.  The VRM allows changing three
parameters for a given regulator: enable state, output voltage, and operating
mode.  The XOB allows changing only a single parameter for a given regulator:
its enable state.  Despite its name, the XOB is capable of controlling the
enable state of any PMIC peripheral.  It is used for clock buffers, low-voltage
switches, and LDO/SMPS regulators which have a fixed voltage and mode.

=======================
Required Node Structure
=======================

RPMh regulators must be described in two levels of device nodes.  The first
level describes the PMIC containing the regulators and must reside within an
RPMh device node.  The second level describes each regulator within the PMIC
which is to be used on the board.  Each of these regulators maps to a single
RPMh resource.

The names used for regulator nodes must match those supported by a given PMIC.
Supported regulator node names:
	PM8998:		smps1 - smps13, ldo1 - ldo28, lvs1 - lvs2
	PMI8998:	bob
	PM8005:		smps1 - smps4

========================
First Level Nodes - PMIC
========================

- compatible
	Usage:      required
	Value type: <string>
	Definition: Must be one of: "qcom,pm8998-rpmh-regulators",
		    "qcom,pmi8998-rpmh-regulators" or
		    "qcom,pm8005-rpmh-regulators".

- qcom,pmic-id
	Usage:      required
	Value type: <string>
	Definition: RPMh resource name suffix used for the regulators found on
		    this PMIC.  Typical values: "a", "b", "c", "d", "e", "f".

- vdd-s1-supply
- vdd-s2-supply
- vdd-s3-supply
- vdd-s4-supply
	Usage:      optional (PM8998 and PM8005 only)
	Value type: <phandle>
	Definition: phandle of the parent supply regulator of one or more of the
		    regulators for this PMIC.

- vdd-s5-supply
- vdd-s6-supply
- vdd-s7-supply
- vdd-s8-supply
- vdd-s9-supply
- vdd-s10-supply
- vdd-s11-supply
- vdd-s12-supply
- vdd-s13-supply
- vdd-l1-l27-supply
- vdd-l2-l8-l17-supply
- vdd-l3-l11-supply
- vdd-l4-l5-supply
- vdd-l6-supply
- vdd-l7-l12-l14-l15-supply
- vdd-l9-supply
- vdd-l10-l23-l25-supply
- vdd-l13-l19-l21-supply
- vdd-l16-l28-supply
- vdd-l18-l22-supply
- vdd-l20-l24-supply
- vdd-l26-supply
- vin-lvs-1-2-supply
	Usage:      optional (PM8998 only)
	Value type: <phandle>
	Definition: phandle of the parent supply regulator of one or more of the
		    regulators for this PMIC.

- vdd-bob-supply
	Usage:      optional (PMI8998 only)
	Value type: <phandle>
	Definition: BOB regulator parent supply phandle

===============================
Second Level Nodes - Regulators
===============================

- qcom,always-wait-for-ack
	Usage:      optional
	Value type: <empty>
	Definition: Boolean flag which indicates that the application processor
		    must wait for an ACK or a NACK from RPMh for every request
		    sent for this regulator including those which are for a
		    strictly lower power state.

Other properties defined in Documentation/devicetree/bindings/regulator.txt
may also be used.  regulator-initial-mode and regulator-allowed-modes may be
specified for VRM regulators using mode values from
include/dt-bindings/regulator/qcom,rpmh-regulator.h.  regulator-allow-bypass
may be specified for BOB type regulators managed via VRM.
regulator-allow-set-load may be specified for LDO type regulators managed via
VRM.

========
Examples
========

#include <dt-bindings/regulator/qcom,rpmh-regulator.h>

&apps_rsc {
	pm8998-rpmh-regulators {
		compatible = "qcom,pm8998-rpmh-regulators";
		qcom,pmic-id = "a";

		vdd-l7-l12-l14-l15-supply = <&pm8998_s5>;

		smps2 {
			regulator-min-microvolt = <1100000>;
			regulator-max-microvolt = <1100000>;
		};

		pm8998_s5: smps5 {
			regulator-min-microvolt = <1904000>;
			regulator-max-microvolt = <2040000>;
		};

		ldo7 {
			regulator-min-microvolt = <1800000>;
			regulator-max-microvolt = <1800000>;
			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
			regulator-allowed-modes =
				<RPMH_REGULATOR_MODE_LPM
				 RPMH_REGULATOR_MODE_HPM>;
			regulator-allow-set-load;
		};

		lvs1 {
			regulator-min-microvolt = <1800000>;
			regulator-max-microvolt = <1800000>;
		};
	};

	pmi8998-rpmh-regulators {
		compatible = "qcom,pmi8998-rpmh-regulators";
		qcom,pmic-id = "b";

		bob {
			regulator-min-microvolt = <3312000>;
			regulator-max-microvolt = <3600000>;
			regulator-allowed-modes =
				<RPMH_REGULATOR_MODE_AUTO
				 RPMH_REGULATOR_MODE_HPM>;
			regulator-initial-mode = <RPMH_REGULATOR_MODE_AUTO>;
		};
	};
};