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extcon: Add documentation for EXTCON_CHG_USB_* and EXTCON_USB_* 

Current there is both "EXTCON_USB" and "EXTCON_CHG_USB_SDP" which
both seem to suggest a standard downstream port. But there is no
documentation describing how these relate.

Thus add documentation to describe EXTCON_CHG_USB_SDP should always
appear together with EXTCON_USB, and EXTCON_CHG_USB_ACA would normally
appear with EXTCON_USB_HOST.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
hifive-unleashed-5.1
Baolin Wang 2016-12-21 14:10:47 +08:00 committed by Chanwoo Choi
parent 01b4c9a1ae
commit db6228612c
1 changed files with 8 additions and 1 deletions
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9
include/linux/extcon.h
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@ -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 */