linux-kernel - Re: [PATCH 23/33] ARM: dts: exynos: Remove empty camera pinctrl configuration in Odroid X/U3

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Message-ID: <CAJKOXPdF4zzXvYrOiGQM9o=4rrWHvEr=o9aSTuR238dEaiD4cQ@mail.gmail.com>
Date:   Mon, 31 Aug 2020 12:42:37 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sylwester Nawrocki <snawrocki@...nel.org>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Denis GNUtoo Carikli <GNUtoo@...erdimension.org>,
        Simon Shields <simon@...eageos.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH 23/33] ARM: dts: exynos: Remove empty camera pinctrl
 configuration in Odroid X/U3

On Mon, 31 Aug 2020 at 12:35, Sylwester Nawrocki <snawrocki@...nel.org> wrote:
>
> Hi,
>
> On 8/31/20 10:38, Krzysztof Kozlowski wrote:
> > On Mon, 31 Aug 2020 at 10:31, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
> >> On 30.08.2020 15:51, Krzysztof Kozlowski wrote:
> >>> The camera's pinctrl configuration is simply empty and not effective.
> >>> Remove it to fix dtbs_check warning:
> >>>
> >>>     arch/arm/boot/dts/exynos4412-odroidx.dt.yaml: camera: pinctrl-0: True is not of type 'array'
> >>>
> >>> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> >>
> >> I think that this was intentional to properly enable support for
> >> mem-2-mem mode in Exynos4-IS (FIMC), but I'm not sure what are the
> >> default values if no pinctrl properties are provided. Sylwester, could
> >> you comment?
> >
> > Indeed it could be intentional... I see now errors:
> > [   33.752203] s5p-fimc-md soc:camera: Failed to get pinctrl: -19
> >
> > I wonder why getting an empty pinctrl is needed... maybe the driver
> > should accept missing pinctrl?
>
> It might have been better to have the pinctrl properties optional, as there
> might be boards without the image sensor attached and FIMC could still be
> used in memory-to-memory mode, as Marek pointed out. But it seems too late
> now to change that. The binding defines the pinctrl properties as required
> (Documentation/devicetree/bindings/media/samsung-fimc.txt) and we need to
> keep them in dtses.

You can always make a required property optional and it is not a break
of ABI. The other way around would be a break. Why then not changing
the driver to accept optional pinctrl?

Best regards,
Krzysztof