devicetree: bindings: Document qcom,kpss-acc

The kpss acc binding describes the clock, reset, and power domain
controller for a Krait CPU.

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,kpss-acc.txt b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
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+Krait Processor Sub-system (KPSS) Application Clock Controller (ACC)
+
+The KPSS ACC provides clock, power domain, and reset control to a Krait CPU.
+There is one ACC register region per CPU within the KPSS remapped region as
+well as an alias register region that remaps accesses to the ACC associated
+with the CPU accessing the region.
+
+PROPERTIES
+
+- compatible:
+       Usage: required
+       Value type: <string>
+       Definition: should be one of:
+                       "qcom,kpss-acc-v1"
+                       "qcom,kpss-acc-v2"
+
+- 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:
+
+       clock-controller@2088000 {
+               compatible = "qcom,kpss-acc-v2";
+               reg = <0x02088000 0x1000>,
+                     <0x02008000 0x1000>;
+       };