dt: bindings: add ath10k wireless device

Document how calibration data can be provided to ath10k via Device Tree.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt b/Documentation/devicetree/bindings/net/wireless/qcom,ath10k.txt
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+* Qualcomm Atheros ath10k wireless devices
+
+For ath10k devices the calibration data can be provided through Device
+Tree. The node is a child node of the PCI controller.
+
+Required properties:
+-compatible : Should be "qcom,ath10k"
+
+Optional properties:
+- qcom,ath10k-calibration-data : calibration data as an array, the
+                                length can vary between hw versions
+
+
+Example:
+
+pci {
+       pcie@0 {
+               reg = <0 0 0 0 0>;
+               #interrupt-cells = <1>;
+               #size-cells = <2>;
+               #address-cells = <3>;
+               device_type = "pci";
+
+               ath10k@0,0 {
+                       reg = <0 0 0 0 0>;
+                       device_type = "pci";
+                       qcom,ath10k-calibration-data = [ 01 02 03 ... ];
+               };
+       };
+};