rtl818x: Add some documentation to the TX desc flags

Add some TX desc flags docs.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtl818x/rtl818x.h

@@ -194,8 +194,18 @@ struct rtl818x_rf_ops {
 	void (*conf_erp)(struct ieee80211_hw *, struct ieee80211_bss_conf *);
 };
 
-/* Tx/Rx flags are common between RTL818X chips */
-
+/**
+ * enum rtl818x_tx_desc_flags - Tx/Rx flags are common between RTL818X chips
+ *
+ * @RTL818X_TX_DESC_FLAG_NO_ENC: Disable hardware based encryption.
+ * @RTL818X_TX_DESC_FLAG_TX_OK: TX frame was ACKed.
+ * @RTL818X_TX_DESC_FLAG_SPLCP: Use short preamble.
+ * @RTL818X_TX_DESC_FLAG_MOREFRAG: More fragments follow.
+ * @RTL818X_TX_DESC_FLAG_CTS: Use CTS-to-self protection.
+ * @RTL818X_TX_DESC_FLAG_RTS: Use RTS/CTS protection.
+ * @RTL818X_TX_DESC_FLAG_LS: Last segment of the frame.
+ * @RTL818X_TX_DESC_FLAG_FS: First segment of the frame.
+ */
 enum rtl818x_tx_desc_flags {
 	RTL818X_TX_DESC_FLAG_NO_ENC	= (1 << 15),
 	RTL818X_TX_DESC_FLAG_TX_OK	= (1 << 15),