diff --git a/sys/dev/ath/ath_hal/ah.c b/sys/dev/ath/ath_hal/ah.c
index c7840c664975..7fd64d1739e1 100644
--- a/sys/dev/ath/ath_hal/ah.c
+++ b/sys/dev/ath/ath_hal/ah.c
@@ -784,6 +784,8 @@ ath_hal_getcapability(struct ath_hal *ah, HAL_CAPABILITY_TYPE type,
 	case HAL_CAP_MFP:			/* Management frame protection setting */
 		*result = pCap->halMfpSupport;
 		return HAL_OK;
+	case HAL_CAP_RX_LNA_MIXING:	/* Hardware uses an RX LNA mixer to map 2 antennas to a 1 stream receiver */
+		return pCap->halRxUsingLnaMixing ? HAL_OK : HAL_ENOTSUPP;
 	default:
 		return HAL_EINVAL;
 	}
diff --git a/sys/dev/ath/ath_hal/ah.h b/sys/dev/ath/ath_hal/ah.h
index 842b6582fd66..f4798a07e2ca 100644
--- a/sys/dev/ath/ath_hal/ah.h
+++ b/sys/dev/ath/ath_hal/ah.h
@@ -198,6 +198,7 @@ typedef enum {
 	HAL_CAP_BB_READ_WAR	= 244,	/* baseband read WAR */
 	HAL_CAP_SERIALISE_WAR	= 245,	/* serialise register access on PCI */
 	HAL_CAP_ENFORCE_TXOP	= 246,	/* Enforce TXOP if supported */
+	HAL_CAP_RX_LNA_MIXING	= 247,	/* RX hardware uses LNA mixing */
 } HAL_CAPABILITY_TYPE;
 
 /* 
diff --git a/sys/dev/ath/ath_hal/ah_internal.h b/sys/dev/ath/ath_hal/ah_internal.h
index 74d43c7daf85..f92df9df0860 100644
--- a/sys/dev/ath/ath_hal/ah_internal.h
+++ b/sys/dev/ath/ath_hal/ah_internal.h
@@ -279,7 +279,8 @@ typedef struct {
 			halAntDivCombSupport		: 1,
 			halAntDivCombSupportOrg		: 1,
 			halRadioRetentionSupport	: 1,
-			halSpectralScanSupport		: 1;
+			halSpectralScanSupport		: 1,
+			halRxUsingLnaMixing		: 1;
 
 	uint32_t	halWirelessModes;
 	uint16_t	halTotalQueues;
diff --git a/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c b/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c
index 5f6a2a9606e7..67a15b846866 100644
--- a/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c
+++ b/sys/dev/ath/ath_hal/ar9002/ar9285_attach.c
@@ -525,6 +525,7 @@ ar9285FillCapabilityInfo(struct ath_hal *ah)
 	pCap->halMbssidAggrSupport = AH_TRUE;  
 	pCap->hal4AddrAggrSupport = AH_TRUE;
 	pCap->halSpectralScanSupport = AH_TRUE;
+	pCap->halRxUsingLnaMixing = AH_TRUE;
 
 	if (AR_SREV_KITE_12_OR_LATER(ah))
 		pCap->halPSPollBroken = AH_FALSE;