extcon: Add new EXTCON_CHG_USB_PD type for USB Power Delivery

This patch adds the new EXTCON_CHG_USB_PD for USB PD (Power Delivery)[1].
The USB Power Delivery specification specifies that USB cable provides
the increased power more than 7.5W to device with larger power demand.
The EXTCON_CHG_USB_PD has the EXTCON_TYPE_CHG and EXTCON_TYPE_USB type.

[1] https://en.wikipedia.org/wiki/USB#PDSigned-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon.c

@@ -99,6 +99,11 @@ struct __extcon_info {
 		.id = EXTCON_CHG_WPT,
 		.name = "WPT",
 	},
+	[EXTCON_CHG_USB_PD] = {
+		.type = EXTCON_TYPE_CHG | EXTCON_TYPE_USB,
+		.id = EXTCON_CHG_USB_PD,
+		.name = "PD",
+	},
 
 	/* Jack external connector */
 	[EXTCON_JACK_MICROPHONE] = {

include/linux/extcon.h

@@ -65,6 +65,7 @@
 #define EXTCON_CHG_USB_FAST	9
 #define EXTCON_CHG_USB_SLOW	10
 #define EXTCON_CHG_WPT		11	/* Wireless Power Transfer */
+#define EXTCON_CHG_USB_PD	12	/* USB Power Delivery */
 
 /* Jack external connector */
 #define EXTCON_JACK_MICROPHONE	20