[ARM] pxa: allow MFP_LPM_INPUT to be explicitly specified

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
diff --git a/arch/arm/plat-pxa/mfp.c b/arch/arm/plat-pxa/mfp.c
index be58f9f..b77e018 100644
--- a/arch/arm/plat-pxa/mfp.c
+++ b/arch/arm/plat-pxa/mfp.c
@@ -110,6 +110,7 @@
 	MFPR_LPM_PULL_LOW,
 	MFPR_LPM_PULL_HIGH,
 	MFPR_LPM_FLOAT,
+	MFPR_LPM_INPUT,
 };
 
 /* mapping of MFP_PULL_* definitions to MFPR_PULL_* register bits */