Some ideas about tcpm driver

Zain Wang wzz at
Fri Aug 4 03:25:59 PDT 2017

在 2017/8/3 21:02, Guenter Roeck 写道:
> On Thu, Aug 3, 2017 at 12:28 AM, Zain Wang <wzz at> wrote:
>> Hi all,
>> In recent days, I tested the fusb302 driver with tcpm. (RK3399 evb board)
>> But I found an issues:
>>      There is not a regulator for type-c vbus power-supply in my board.
>>      The vbus is just controlled by a gpio-pin, and unable to support other
>> voltage except 5V.
> gpio-regulator does not work ?
Thanks for you idea, it works well with regulator-gpio.

>>      But now, I can't use fusb302 driver without workaround fix.
>>      Could you fix it in next version? @Yueyao
>> The altmode looks not complete. I can't enter DP Alt Mode now.
> Yes, I know. Patches welcome.
>> And we'd like to used extcon function (used in Chrome) to link usb, dp and
>> type-c together.
> Plan is to use the extcon driver (from cros-ec) to register with the
> type-c infrastructure. I have not thought about how to tie low level
> drivers (fusb/tcpm) with extcon. Ideas welcome.
> Guenter
>> How do you think about it? @Guenter
>> Thanks
>> Zain

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