linux-kernel - Re: Some ideas about tcpm driver

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Message-ID: <CABXOdTf1661zJDnQf1ddqTWYozMMH=vAHbQUVM5LxKZ=vX5Qgg@mail.gmail.com>
Date:   Thu, 3 Aug 2017 06:02:54 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Zain Wang <wzz@...k-chips.com>
Cc:     Guenter Roeck <groeck@...omium.org>,
        Yueyao Zhu <yueyao@...gle.com>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Some ideas about tcpm driver

On Thu, Aug 3, 2017 at 12:28 AM, Zain Wang <wzz@...k-chips.com> 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 ?

>     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
>