linux-kernel - Re: [PATCH] extcon: Introduce EXTCON_PROP_DISP

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Date:   Sun, 11 Sep 2016 19:29:03 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Chris Zhong <zyw@...k-chips.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "cpgs (cpgs@...sung.com)" <cpgs@...sung.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH] extcon: Introduce EXTCON_PROP_DISP_HPD property

On Sun, Sep 11, 2016 at 7:23 PM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
> Hi Chris,
>
> On 2016년 09월 12일 10:03, Chanwoo Choi wrote:
>> Hi Chris,
>>
>> On 2016년 09월 10일 09:33, Chris Zhong wrote:
>>> EXTCON_PROP_DISP_HPD is need by display port, if the system has no hpd
>>> interrupt, this property can be used.
>>
>> What is meaning of HPD? So, you need to add the
>> description and reference for HPD in commit message.
>>
>> For example,
>> When adding EXTCON_PROP_USB_SS property[1],
>> the commit message included the reference for USB SuperSpeed.
>> [1] https://git.kernel.org/cgit/linux/kernel/git/chanwoo/extcon.git/commit/?h=extcon-next&id=8457a1b49a2af0a0e71f80afed9f7c80de361610
>>
>>>
>>> Change-Id: I8b3eb78429126eaa369b10711b7f857b0a3df8ed
>>
>> You have to remove the 'Change-Id'.
>>
>>> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>>> ---
>>>  include/linux/extcon.h | 14 +++++++++++++-
>>>  1 file changed, 13 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/include/linux/extcon.h b/include/linux/extcon.h
>>> index 9147c42..4411893 100644
>>> --- a/include/linux/extcon.h
>>> +++ b/include/linux/extcon.h
>>> @@ -131,9 +131,21 @@
>>>  #define EXTCON_PROP_JACK_MAX                100
>>>  #define EXTCON_PROP_JACK_CNT (EXTCON_PROP_JACK_MAX - EXTCON_PROP_JACK_MIN + 1)
>>>
>>> +/*
>>> + * Properties of EXTCON_TYPE_DISP.
>>> + *
>>> + * - EXTCON_PROP_DISP_HPD
>>
>> You should add the full name of 'HPD'.
>
> On previous mail, I replied ambiguous comment.
>
> I mean that you better to add the property name with full name as following:
>
>         EXTCON_PROP_DISP_HPD ( Hxxx Pxxx Dxxx)

What do you prefer ?

HOTPLUGDETECT ? HOT_PLUG_DETECT ? HOTPLUG_DETECT ?

The term "HPD" seems to be quite common in the DisplayPort world; in
most presentations it isn't even explained. Personally I would prefer
to stick with HPD and explain it in the comments.

Guenter

>
> [snip]
>
> --
> Best Regards,
> Chanwoo Choi