From: Ben Dooks <ben@trinity.fluff.org>
To: Doug Anderson <dianders@chromium.org>
Cc: Kukjin Kim <kgene.kim@samsung.com>,
linux-watchdog@vger.kernel.org,
Leela Krishna Amudala <l.krishna@samsung.com>,
Tomasz Figa <tomasz.figa@gmail.com>,
linux-kernel@vger.kernel.org, Wim Van Sebroeck <wim@iguana.be>,
linux-samsung-soc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Ben Dooks <ben-linux@fluff.org>, Olof Johansson <olof@lixom.net>,
Guenter Roeck <linux@roeck-us.net>
Subject: Re: [PATCH] watchdog: s3c2410_wdt: Only register for cpufreq on CPU_FREQ_S3C24XX
Date: Tue, 26 Nov 2013 00:08:31 +0000 [thread overview]
Message-ID: <20131126000831.GW12108@trinity.fluff.org> (raw)
In-Reply-To: <1385420137-32725-1-git-send-email-dianders@chromium.org>
On Mon, Nov 25, 2013 at 02:55:37PM -0800, Doug Anderson wrote:
> On modern SoCs the watchdog timer is parented on a clock that doesn't
> change every time we have a cpufreq change. That means we don't need
> to constantly adjust the watchdog timer, so avoid registering for and
> dealing with cpufreq transitions unless we've actually got
> CPU_FREQ_S3C24XX defined.
The S3C2410 to at-least S3C2440 there is only one PLL/clock-divider
set so changing any part of that can change frequency supplied to
the watchdog.
WARNING: multiple messages have this Message-ID (diff)
From: Ben Dooks <ben@trinity.fluff.org>
To: Doug Anderson <dianders@chromium.org>
Cc: Wim Van Sebroeck <wim@iguana.be>,
Guenter Roeck <linux@roeck-us.net>,
Leela Krishna Amudala <l.krishna@samsung.com>,
Olof Johansson <olof@lixom.net>,
Tomasz Figa <tomasz.figa@gmail.com>,
Kukjin Kim <kgene.kim@samsung.com>,
Ben Dooks <ben-linux@fluff.org>,
linux-arm-kernel@lists.infradead.org,
linux-samsung-soc@vger.kernel.org,
linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] watchdog: s3c2410_wdt: Only register for cpufreq on CPU_FREQ_S3C24XX
Date: Tue, 26 Nov 2013 00:08:31 +0000 [thread overview]
Message-ID: <20131126000831.GW12108@trinity.fluff.org> (raw)
In-Reply-To: <1385420137-32725-1-git-send-email-dianders@chromium.org>
On Mon, Nov 25, 2013 at 02:55:37PM -0800, Doug Anderson wrote:
> On modern SoCs the watchdog timer is parented on a clock that doesn't
> change every time we have a cpufreq change. That means we don't need
> to constantly adjust the watchdog timer, so avoid registering for and
> dealing with cpufreq transitions unless we've actually got
> CPU_FREQ_S3C24XX defined.
The S3C2410 to at-least S3C2440 there is only one PLL/clock-divider
set so changing any part of that can change frequency supplied to
the watchdog.
WARNING: multiple messages have this Message-ID (diff)
From: ben@trinity.fluff.org (Ben Dooks)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] watchdog: s3c2410_wdt: Only register for cpufreq on CPU_FREQ_S3C24XX
Date: Tue, 26 Nov 2013 00:08:31 +0000 [thread overview]
Message-ID: <20131126000831.GW12108@trinity.fluff.org> (raw)
In-Reply-To: <1385420137-32725-1-git-send-email-dianders@chromium.org>
On Mon, Nov 25, 2013 at 02:55:37PM -0800, Doug Anderson wrote:
> On modern SoCs the watchdog timer is parented on a clock that doesn't
> change every time we have a cpufreq change. That means we don't need
> to constantly adjust the watchdog timer, so avoid registering for and
> dealing with cpufreq transitions unless we've actually got
> CPU_FREQ_S3C24XX defined.
The S3C2410 to at-least S3C2440 there is only one PLL/clock-divider
set so changing any part of that can change frequency supplied to
the watchdog.
next prev parent reply other threads:[~2013-11-26 0:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-25 22:55 [PATCH] watchdog: s3c2410_wdt: Only register for cpufreq on CPU_FREQ_S3C24XX Doug Anderson
2013-11-25 22:55 ` Doug Anderson
2013-11-25 23:23 ` Guenter Roeck
2013-11-25 23:23 ` Guenter Roeck
2013-11-25 23:27 ` Tomasz Figa
2013-11-25 23:27 ` Tomasz Figa
2013-11-25 23:28 ` Doug Anderson
2013-11-25 23:28 ` Doug Anderson
2013-11-25 23:31 ` Tomasz Figa
2013-11-25 23:31 ` Tomasz Figa
2013-11-25 23:36 ` [PATCH v2] watchdog: s3c2410_wdt: Only register for cpufreq on ARM_S3C24XX_CPUFREQ Doug Anderson
2013-11-25 23:36 ` Doug Anderson
2013-11-26 0:03 ` Tomasz Figa
2013-11-26 0:03 ` Tomasz Figa
2013-11-26 18:14 ` Guenter Roeck
2013-11-26 18:14 ` Guenter Roeck
2014-01-08 19:54 ` Wim Van Sebroeck
2013-11-26 0:08 ` Ben Dooks [this message]
2013-11-26 0:08 ` [PATCH] watchdog: s3c2410_wdt: Only register for cpufreq on CPU_FREQ_S3C24XX Ben Dooks
2013-11-26 0:08 ` Ben Dooks
2013-11-26 0:16 ` Tomasz Figa
2013-11-26 0:16 ` Tomasz Figa
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