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

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Message-ID: <YzFwst0GpdRBx/9l@aptenodytes>
Date:   Mon, 26 Sep 2022 11:28:18 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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>,
        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

Hi Samuel,

On Fri 12 Aug 22, 17:19, 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.

[...]

Coming back to this series, I don't really get the point of introducing the
interrupt in the bindings and the device-tree sources if the interrupt is not
required for normal operation. I would just drop it.

I recall I was in the same situation for the MIPI CSI-2 controllers, which also
have a dedicated interrupt but only useful for debugging/error reporting.
I was asked not to introduce it back then, so I suppose the same should apply.

What do you think?

Cheers,

Paul

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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