linux-kernel - Re: [v6 PATCH 1/6] extcon: Add Type-C and DP support

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Date:	Fri, 22 Jul 2016 11:21:41 -0700
From:	Guenter Roeck <groeck@...gle.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	Chris Zhong <zyw@...k-chips.com>,
	Douglas Anderson <dianders@...omium.org>,
	Tomasz Figa <tfiga@...omium.org>,
	Heiko Stübner <heiko@...ech.de>,
	姚智情 <yzq@...k-chips.com>,
	Guenter Roeck <groeck@...omium.org>, myungjoo.ham@...sung.com,
	wulf <wulf@...k-chips.com>,
	Stéphane Marchesin <marcheu@...omium.org>,
	"open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [v6 PATCH 1/6] extcon: Add Type-C and DP support

Hi,

On Fri, Jul 22, 2016 at 2:29 AM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
> Hi Chris,
>
> I'm sorry for late reply. I finished the first draft to support the extcon property.
> You can check the patches[1]. But, I need more time to test it. After tested it,
> I'll send the patches.
>
> [1] https://git.kernel.org/cgit/linux/kernel/git/chanwoo/extcon.git/log/?h=extcon-test
>
> Chanwoo Choi (4):
>   extcon: Add the extcon_type to group each connector into five category
>   extcon: Add the support for extcon property according to type of connector
>   extcon: Rename the extcon_set/get_state() to maintain the function naming pattern
>   extcon: Add the sync APIs to support the  notification for extcon property
>
> Chris Zhong (1):
>   extcon: Add EXTCON_DISP_DP and the property for USB Type-C
>

Couple of comments:

- In extcon.c, line 560: 'state' is unused.

- extcon_set_property(edev, EXTCON_USB, EXTCON_USB_VBUS, 0);
  does not work. As written, it has to be something like:

  union extcon_property_value prop;
  ...
  prop.intval = vbus_state;
  extcon_set_property(edev, EXTCON_USB, EXTCON_USB_VBUS, prop);

- For USB, the state of EXTCON_USB, EXTCON_USB_HOST, and
EXTCON_DISP_DP tend to change at the same time, together with the
associated properties.
  It might be desirable to have an equivalent of extcon_sync_all(edev);

Thanks,
Guenter