Documentation: dt: net: add ath9k wireless device binding

Add documentation how devicetree can be used to configure ath9k based
devices.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

diff --git a/Documentation/devicetree/bindings/net/wireless/qca,ath9k.txt b/Documentation/devicetree/bindings/net/wireless/qca,ath9k.txt
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+* Qualcomm Atheros ath9k wireless devices
+
+This node provides properties for configuring the ath9k wireless device. The
+node is expected to be specified as a child node of the PCI controller to
+which the wireless chip is connected.
+
+Required properties:
+- compatible: For PCI and PCIe devices this should be an identifier following
+               the format as defined in "PCI Bus Binding to Open Firmware"
+               Revision 2.1. One of the possible formats is "pciVVVV,DDDD"
+               where VVVV is the PCI vendor ID and DDDD is PCI device ID.
+               Typically QCA's PCI vendor ID 168c is used while the PCI device
+               ID depends on the chipset - see the following (possibly
+               incomplete) list:
+                       - 0023 for AR5416
+                       - 0024 for AR5418
+                       - 0027 for AR9160
+                       - 0029 for AR9220 and AR9223
+                       - 002a for AR9280 and AR9283
+                       - 002b for AR9285
+                       - 002c for AR2427
+                       - 002d for AR9227
+                       - 002e for AR9287
+                       - 0030 for AR9380, AR9381 and AR9382
+                       - 0032 for AR9485
+                       - 0033 for AR9580 and AR9590
+                       - 0034 for AR9462
+                       - 0036 for AR9565
+                       - 0037 for AR9485
+- reg: Address and length of the register set for the device.
+
+Optional properties:
+- qca,no-eeprom: Indicates that there is no physical EEPROM connected to the
+                       ath9k wireless chip (in this case the calibration /
+                       EEPROM data will be loaded from userspace using the
+                       kernel firmware loader).
+- mac-address: See ethernet.txt in the parent directory
+- local-mac-address: See ethernet.txt in the parent directory
+
+
+In this example, the node is defined as child node of the PCI controller:
+&pci0 {
+       wifi@168c,002d {
+               compatible = "pci168c,002d";
+               reg = <0x7000 0 0 0 0x1000>;
+               qca,no-eeprom;
+       };
+};