linux-kernel - Re: [PATCH v2] ARM: Drop fixed 200 Hz timer requirement from Samsung platforms

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Message-ID: <20161121092445.GA1041@n2100.armlinux.org.uk>
Date:   Mon, 21 Nov 2016 09:24:45 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Tomasz Figa <tomasz.figa@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Lee Jones <lee.jones@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH v2] ARM: Drop fixed 200 Hz timer requirement from Samsung
 platforms

On Mon, Nov 21, 2016 at 03:01:57PM +0900, Tomasz Figa wrote:
> One thing to correct here is that the typical clock is PCLK, which is
> derived from one of the PLLs and AFAIR is between 33-66 MHz on
> s3c24xx. Technically you can drive the PWM block from an external
> clock (12 MHz for some board-file based boards), but for simplicity
> this functionality was omitted in the new PWM timer driver used for DT
> boards (which worked fine with the PWM driven by PCLK).

So that's a knowingly-made regression for s3c24xx then.  Pretty
disgusting developer behavior to do that, IMHO.

-- 
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