Seems there are something wrong in the datasheet, try
--- a/drivers/net/wireless/ath/ath9k/reg.h
+++ b/drivers/net/wireless/ath/ath9k/reg.h
@@ -1122,8 +1122,8 @@ enum {
#define AR9300_NUM_GPIO 16
#define AR9330_NUM_GPIO 16
#define AR9340_NUM_GPIO 23
-#define AR9462_NUM_GPIO 10
-#define AR9485_NUM_GPIO 12
+#define AR9462_NUM_GPIO 14
+#define AR9485_NUM_GPIO 11
#define AR9531_NUM_GPIO 18
#define AR9550_NUM_GPIO 24
#define AR9561_NUM_GPIO 23
@@ -1139,8 +1139,8 @@ enum {
#define AR9300_GPIO_MASK 0x0000F4FF
#define AR9330_GPIO_MASK 0x0000F4FF
#define AR9340_GPIO_MASK 0x0000000F
-#define AR9462_GPIO_MASK 0x000003FF
-#define AR9485_GPIO_MASK 0x00000FFF
+#define AR9462_GPIO_MASK 0x00003FFF
+#define AR9485_GPIO_MASK 0x000007FF
#define AR9531_GPIO_MASK 0x0000000F
#define AR9550_GPIO_MASK 0x0000000F
#define AR9561_GPIO_MASK 0x0000000F