devicetree: bindings: Document qcom,saw2 node

The saw2 binding describes the SPM/AVS wrapper hardware used to
control the regulator supplying voltage to the Krait CPUs.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>

diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,saw2.txt b/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
+micro-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.
+
+PROPERTIES
+
+- compatible:
+       Usage: required
+       Value type: <string>
+       Definition: shall contain "qcom,saw2". A more specific value should be
+                   one of:
+                        "qcom,saw2-v1"
+                        "qcom,saw2-v1.1"
+                        "qcom,saw2-v2"
+                        "qcom,saw2-v2.1"
+
+- 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.
+
+
+Example:
+
+       regulator@2099000 {
+               compatible = "qcom,saw2";
+               reg = <0x02099000 0x1000>, <0x02009000 0x1000>;
+       };