dt-bindings: clock: Document qcom,krait-cc

The Krait clock controller controls the krait CPU and the L2 clocks
consisting a primary mux and secondary mux. Add document for that.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Tested-by: Craig Tatlor <ctatlor97@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/qcom,krait-cc.txt

+Krait Clock Controller
+
+PROPERTIES
+
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: must be one of:
+			"qcom,krait-cc-v1"
+			"qcom,krait-cc-v2"
+
+- #clock-cells:
+	Usage: required
+	Value type: <u32>
+	Definition: must be 1
+
+- clocks:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: reference to the clock parents of hfpll, secondary muxes.
+
+- clock-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "hfpll0", "hfpll1", "acpu0_aux", "acpu1_aux", "qsb".
+
+Example:
+
+	kraitcc: clock-controller {
+		compatible = "qcom,krait-cc-v1";
+		clocks = <&hfpll0>, <&hfpll1>, <&acpu0_aux>, <&acpu1_aux>, <qsb>;
+		clock-names = "hfpll0", "hfpll1", "acpu0_aux", "acpu1_aux", "qsb";
+		#clock-cells = <1>;
+	};