[v3 PATCH 1/5] extcon: Add Type-C and DP support
groeck at google.com
Wed Jul 6 13:22:27 PDT 2016
On Tue, Jun 28, 2016 at 6:40 PM, Chanwoo Choi <cwchoi00 at gmail.com> wrote:
> Hi Guenter,
> 2016년 6월 29일 수요일, Guenter Roeck<groeck at google.com>님이 작성한 메시지:
>> On Tue, Jun 28, 2016 at 5:26 AM, Chanwoo Choi <cwchoi00 at gmail.com> wrote:
>> > Hi Chris,
>> > I agree to add the new EXTCON_DISP_DP connector.
>> > But, other new definition should be discussed.
>> > - EXTCON_DISP_DP_ALT
>> > - EXTCON_TYPEC_POLARITY
>> > - EXTCON_TYPEC_PIN_ASSIGN
>> > I think that TYPEC_POLARITY and TYPEC_PIN_ASSING are not appropriate
>> > as the new external connector definition. These are the property or
>> > attribute of
>> > USB connector with C-type.
>> > Also, EXTCON_DISP_DP_ALT is not a new type of connector.
>> > It is just one of the mode for DP connector.
>> > As I knew, DP alternative mode use the USB connector with C-type.
>> > So, DP alternative mode can be expressed on following:
>> > = EXTCON_DISP_DP + EXTCON_USB + some property of USB c-type
>> Problem is that extcon doesn't support exchanging cable properties
>> between cable providers (extcon drivers) and consumers, other than
>> cable states. In order to exchange properties such as polarity and pin
>> assignments, we would need a separate infrastructure. But then the
>> question would be why to use extcon in the first place.
>> If you have a solution for that puzzle, please let us know.
> You're right.
> Current extcon don't support the cable properties.
> The requirement about cables properties occur such as USB ID and VBUS pin.
> So, I'll support the cable properties in extcon framework and send the
> patches within this week.
Did you have time to look into this ? Any idea if/when you will send
the patches ?
More information about the Linux-rockchip