linux-kernel - Re: [PATCH v8 2/3] drm/panel: Add support for S6E3HA2 panel driver on TM2 board

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Date:   Tue, 31 Jan 2017 13:30:16 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Inki Dae <daeinki@...il.com>
Cc:     Hoegeun Kwon <hoegeun.kwon@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>, robh@...nel.org,
        Dave Airlie <airlied@...ux.ie>, Kukjin Kim <kgene@...nel.org>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Andi Shyti <andi.shyti@...sung.com>,
        Donghwa Lee <dh09.lee@...sung.com>,
        Hyungwon Hwang <human.hwang@...sung.com>
Subject: Re: [PATCH v8 2/3] drm/panel: Add support for S6E3HA2 panel driver on
 TM2 board

On Tue, Jan 31, 2017 at 12:37 PM, Inki Dae <daeinki@...il.com> wrote:
> 2017-01-31 19:01 GMT+09:00 Krzysztof Kozlowski <krzk@...nel.org>:
>> On Tue, Jan 31, 2017 at 11:34 AM, Inki Dae <inki.dae@...sung.com> wrote:
>>>
>>>
>>> 2017년 01월 31일 18:22에 Krzysztof Kozlowski 이(가) 쓴 글:
>>>> On Tue, Jan 31, 2017 at 2:01 AM, Inki Dae <inki.dae@...sung.com> wrote:
>>>>>
>>>>>
>>>>> 2017년 01월 24일 10:50에 Hoegeun Kwon 이(가) 쓴 글:
>>>>>> Dear Thierry,
>>>>>>
>>>>>> Could you please review this patch?
>>>>>
>>>>> Thierry, I think this patch has been reviewed enough but no comment from you. Seems you are busy. I will pick up this.
>>>>>
>>>>
>>>> Comments from v8 were not resolved and I think we are waiting for v9:
>>>> https://lkml.org/lkml/2017/1/11/178
>>>>
>>>> If that is not correct then please clarify.
>>>
>>> Seems you pointed to change te-gpios bindings to optional. right?
>>>
>>> I thought Rob left ack so it's no problem.
>>> https://lkml.org/lkml/2017/1/13/626
>>
>> Yes, change them to optional. I think it is a problem (regardless of
>> Rob's ack) because you are merging a driver requiring a property which
>> soon you want to remove. If you merge it (like this) removal of
>> te-gpios property will be breakage of ABI. This is not a serious
>> problem but knowing such plan of te-gpios removal upfront, it would be
>> wrong to commit such driver.
>
> This is a trivial thing so it doesn't make breakage of ABI because the
> property, te-gpios, is *optional*.

So why bindings document is not changed?

+Required properties:
(...)
+  - te-gpios: a GPIO spec for the tearing effect synchronization signal
+    gpio pin (active high)

Andrzej pointed this out and it is not fixed since then. What is the
problem with fixing the bindings documentation?

> Anyway, this wouldn't be *the things* Thierry mentioned.

Probably not, I did not respond to Thierry's feedback.

Best regards,
Krzysztof