Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / arm / msm / qcom,saw2.txt

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+SPM AVS Wrapper 2 (SAW2)
+
+The SAW2 is a wrapper around the Subsystem Power Manager (SPM) and the
+Adaptive Voltage Scaling (AVS) hardware. The SPM is a programmable
+power-controller that transitions a piece of hardware (like a processor or
+subsystem) into and out of low power modes via a direct connection to
+the PMIC. It can also be wired up to interact with other processors in the
+system, notifying them when a low power state is entered or exited.
+
+Multiple revisions of the SAW hardware are supported using these Device Nodes.
+SAW2 revisions differ in the register offset and configuration data. Also, the
+same revision of the SAW in different SoCs may have different configuration
+data due the the differences in hardware capabilities. Hence the SoC name, the
+version of the SAW hardware in that SoC and the distinction between cpu (big
+or Little) or cache, may be needed to uniquely identify the SAW register
+configuration and initialization data. The compatible string is used to
+indicate this parameter.
+
+PROPERTIES
+
+- compatible:
+       Usage: required
+       Value type: <string>
+       Definition: Must have
+                       "qcom,saw2"
+                   A more specific value could be one of:
+                       "qcom,apq8064-saw2-v1.1-cpu"
+                       "qcom,msm8974-saw2-v2.1-cpu"
+                       "qcom,apq8084-saw2-v2.1-cpu"
+
+- reg:
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: the first element specifies the base address and size of
+                   the register region. An optional second element specifies
+                   the base address and size of the alias register region.
+
+- regulator:
+       Usage: optional
+       Value type: boolean
+       Definition: Indicates that this SPM device acts as a regulator device
+                       device for the core (CPU or Cache) the SPM is attached
+                       to.
+
+Example 1:
+
+       power-controller@2099000 {
+               compatible = "qcom,saw2";
+               reg = <0x02099000 0x1000>, <0x02009000 0x1000>;
+               regulator;
+       };
+
+Example 2:
+       saw0: power-controller@f9089000 {
+               compatible = "qcom,apq8084-saw2-v2.1-cpu", "qcom,saw2";
+               reg = <0xf9089000 0x1000>, <0xf9009000 0x1000>;
+       };