Commit ba68227e authored by Bjorn Andersson's avatar Bjorn Andersson Committed by Andy Gross

devicetree: soc: Add Qualcomm SMD based RPM DT binding

Add binding documentation for the Qualcomm Resource Power Manager (RPM)
using shared memory (Qualcomm SMD) as transport mechanism. This is found
in 8974 and newer based devices.

The binding currently describes the rpm itself and the regulator
subnodes.
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: default avatarAndy Gross <agross@codeaurora.org>
parent 936f14cf
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>;
};
};
};
};
};
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