From: Doug Anderson <dianders@chromium.org>
To: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Cc: "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
Simon Glass <sjg@chromium.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
Wolfram Sang <wsa@the-dreams.de>, Ben Dooks <ben-linux@fluff.org>,
Grant Likely <grant.likely@secretlab.ca>,
"broonie@kernel.org" <broonie@kernel.org>,
"cpgs ." <cpgs@samsung.com>, Tomasz Figa <t.figa@samsung.com>
Subject: Re: [PATCH v3] i2c: s3c2410: dont need CPU_FREQ transitions for exynos series
Date: Mon, 25 Nov 2013 15:41:43 -0800 [thread overview]
Message-ID: <CAD=FV=Wu13jiFggjp9FZrnB0ejODR7ix_jSby+waZwpcACLwXA@mail.gmail.com> (raw)
In-Reply-To: <1384841915-8264-1-git-send-email-ch.naveen@samsung.com>
Naveen,
On Mon, Nov 18, 2013 at 10:18 PM, Naveen Krishna Chatradhi
<ch.naveen@samsung.com> wrote:
> For Exynos4 and Exynos5 SoCs from Samsung the i2c clock is based
> on a fixed 66 MHz peripheral clock, and therefore is completely
> independent of the cpu frequency.
> Thus, registering for a CPU freq notifier is very wasteful.
>
> This patch modifes the code such that, i2c bus registers to
> cpu_freq_transition only if CONFIG_CPU_FREQ_S3C24XX is enabled.
>
> This change should save a bunch of cpufreq transitions calls
> which does not apply to exynos SoCs.
>
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
> Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
> Reviewed-by: Doug Anderson <dianders@chromium.org>
> ---
> Changes since v2:
> None, Rebased on for-next of linux-i2c git repo.
>
> Changes since v1:
> Use CONFIG_CPU_FREQ_S3C24XX instead of (CONFIG_CPU_FREQ & !CONFIG_EXYNOS)
> As commented by Tomasz
>
> drivers/i2c/busses/i2c-s3c2410.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
Can you please spin this with comments from
<https://patchwork.kernel.org/patch/3235091/>? Thanks!
-Doug
next prev parent reply other threads:[~2013-11-25 23:41 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-11 11:26 [PATCH] i2c: s3c2410: dont need CPU_FREQ transitions for exynos series Naveen Krishna Chatradhi
2013-10-12 2:22 ` Tomasz Figa
2013-10-12 2:28 ` Tomasz Figa
2013-10-12 5:42 ` Tomasz Figa
2013-10-12 6:36 ` Naveen Krishna Ch
2013-10-15 6:23 ` [PATCH v2] " Naveen Krishna Chatradhi
2013-10-15 6:56 ` Kyungmin Park
2013-10-15 15:38 ` Doug Anderson
2013-11-19 6:18 ` [PATCH v3] " Naveen Krishna Chatradhi
2013-11-25 23:41 ` Doug Anderson [this message]
2013-11-26 4:07 ` Naveen Krishna Ch
2013-11-26 4:22 ` [PATCH v4] " Naveen Krishna Chatradhi
2013-12-09 16:09 ` Tomasz Figa
2014-01-03 16:23 ` Wolfram Sang
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