linux-kernel - Some ideas about tcpm driver

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Date:   Thu, 3 Aug 2017 15:28:53 +0800
From:   Zain Wang <wzz@...k-chips.com>
To:     Guenter Roeck <groeck@...omium.org>, Yueyao Zhu <yueyao@...gle.com>
Cc:     "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Some ideas about tcpm driver

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.
     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.
And we'd like to used extcon function (used in Chrome) to link usb, dp 
and type-c together.
How do you think about it? @Guenter

Thanks
Zain