linux-kernel - Re: [PATCH v3 4/6] [media] exynos-gsc: Add hardware rotation limits

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Date:   Wed, 13 Sep 2017 18:28:02 +0900
From:   Hoegeun Kwon <hoegeun.kwon@...sung.com>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     mchehab@...nel.org, inki.dae@...sung.com, airlied@...ux.ie,
        kgene@...nel.org, krzk@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, catalin.marinas@....com, will.deacon@....com,
        m.szyprowski@...sung.com, devicetree@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        Hoegeun Kwon <hoegeun.kwon@...sung.com>
Subject: Re: [PATCH v3 4/6] [media] exynos-gsc: Add hardware rotation limits

On 09/13/2017 06:11 PM, Sylwester Nawrocki wrote:
> Hi Hoegeun,
>
> On 09/13/2017 04:33 AM, Hoegeun Kwon wrote:
>>>> @@ -1017,8 +1083,12 @@ static irqreturn_t gsc_irq_handler(int irq,
>>>> void *priv)
>>>>       static const struct of_device_id exynos_gsc_match[] = {
>>>>         {
>>>> -        .compatible = "samsung,exynos5-gsc",
>>>> -        .data = &gsc_v_100_drvdata,
>>> Can you keep the "samsung,exynos5-gsc" entry with the gsc_v_5250_variant
>>> data, so that it can work with "samsung,exynos5-gsc" compatible in DT
>>> on both exynos5250 and exynos5420 SoCs?
>>>
>> Thank you for your question.
>>
>> Exynos 5250 and 5420 have different hardware rotation limits.
>> Exynos 5250 is '.real_rot_en_w/h = 2016' and 5420 is '.real_rot_en_w/h =
>> 2048'.
>>
>> So my opinion they must have different compatible.
> I think there is some misunderstanding, mu suggestion was to keep the
> "samsung,exynos5-gsc" compatible entry in addition to the new introduced
> ones: "samsung,exynos5250-gsc" and "samsung,exynos5420-gsc". That's in
> order to make your changes possibly backward compatible, in theory
> the updated driver should still work without changes in dts.


Thank you again for your explanation.

Yes, I understood.
I will keep "samsung,exynos5-gsc" compatible,
and add Exynos 5250/5420/5433 compatible.

Best regards,
Hoegeun