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-rw-r--r--include/linux/extcon.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/extcon.h b/include/linux/extcon.h
index b871c0cb1f02..00201230bea5 100644
--- a/include/linux/extcon.h
+++ b/include/linux/extcon.h
@@ -46,7 +46,14 @@
#define EXTCON_USB 1
#define EXTCON_USB_HOST 2
-/* Charging external connector */
+/*
+ * Charging external connector
+ *
+ * When one SDP charger connector was reported, we should also report
+ * the USB connector, which means EXTCON_CHG_USB_SDP should always
+ * appear together with EXTCON_USB. The same as ACA charger connector,
+ * EXTCON_CHG_USB_ACA would normally appear with EXTCON_USB_HOST.
+ */
#define EXTCON_CHG_USB_SDP 5 /* Standard Downstream Port */
#define EXTCON_CHG_USB_DCP 6 /* Dedicated Charging Port */
#define EXTCON_CHG_USB_CDP 7 /* Charging Downstream Port */