linux-kernel - Re: [PATCH 1/8] dt-bindings: sun6i-a31-mipi-dphy: Add the interrupts property

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Date:   Tue, 16 Aug 2022 13:18:23 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Samuel Holland <samuel@...lland.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maxime Ripard <mripard@...nel.org>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <maxime@...no.tech>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 1/8] dt-bindings: sun6i-a31-mipi-dphy: Add the interrupts
 property

On 13/08/2022 01:19, Samuel Holland wrote:
> On 8/12/22 5:45 AM, Krzysztof Kozlowski wrote:
>> On 12/08/2022 10:55, Samuel Holland wrote:
>>> The sun6i DPHY can generate several interrupts, mostly for reporting
>>> error conditions, but also for detecting BTA and UPLS sequences.
>>> Document this capability in order to accurately describe the hardware.
>>>
>>> The DPHY has no interrupt number provided in the vendor documentation
>>> because its interrupt line is shared with the DSI controller.
>>>
>>> Fixes: c25b84c00826 ("dt-bindings: display: Convert Allwinner DSI to a schema")
>>
>> I don't understand what is being fixed in that commit. That commit did
>> not have interrupts in D-PHY, so what was broken by it?
>>
>> The Fixes tag annotates the commit which introduced a bug.
> 
> The binding had a bug because it did not accurately describe the hardware. If
> you don't think this warrants a Fixes tag, I can remove it. Or are you
> suggesting that the Fixes tag should instead reference the commit adding the
> original .txt binding?

Yes, the latter. If original binding were not complete (although just
"incompleteness" is not really a bug, unless it is something
serious/obvious etc), then TXT commit should be the fixed one.

The backports of course will not go that deep, but Fixes tag is used
also for statistics which kernel release actually brought the bug.
Therefore adjusting Fixes just for sake of backporting is not good -
messes up with statistics.


Best regards,
Krzysztof