linux-kernel - Re: [PATCH v2 3/8] ARM: dts: exynos: Fix watchdog reset on Exynos4412

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Message-ID: <CAJKOXPcoP7c=TTFtWqBLMXT0BS_yi3fpu8X3q4sxCTM9m=mPmw@mail.gmail.com>
Date:   Tue, 14 Mar 2017 15:09:25 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v2 3/8] ARM: dts: exynos: Fix watchdog reset on Exynos4412

On Tue, Mar 14, 2017 at 3:03 PM, Bartlomiej Zolnierkiewicz
<b.zolnierkie@...sung.com> wrote:
>
> Hi,
>
> On Saturday, March 11, 2017 07:25:22 PM Krzysztof Kozlowski wrote:
>> The Exynos4412 has the same watchdog as newer SoCs (e.g. Exynos5250).
>> Just like the others, for working it requires additional steps in Power
>> Management Unit: unmasking the reset request and enabling the system
>> reset.  Without these additional steps in PMU, the watchdog will not be
>> able to reset the system on expiration event.
>>
>> Change the compatible of Exynos4412 watchdog device node to
>> samsung,exynos5250-wdt which includes the additional PMU steps.
>
> This is going to confuse people.  How's about doing it cleanly
> (by adding samsung,exynos4412-wdt compatible and convert existing
> users to use instead)?

I don't find usage of 5250 in Exynos4412 DTS as confusing because
since long time I do not threat these numbers as having any meaning
(e.g. 3250 is newer...). Yes, we can duplicate the compatible for that
purpose. Care to send a patch for this?

Best regards,
Krzysztof