linux-kernel - Re: [PATCH v3] i2c: s3c2410: dont need CPU

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAD=FV=Wu13jiFggjp9FZrnB0ejODR7ix_jSby+waZwpcACLwXA@mail.gmail.com>
Date:	Mon, 25 Nov 2013 15:41:43 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Naveen Krishna Chatradhi <ch.naveen@...sung.com>
Cc:	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Simon Glass <sjg@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Ben Dooks <ben-linux@...ff.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"cpgs ." <cpgs@...sung.com>, Tomasz Figa <t.figa@...sung.com>
Subject: Re: [PATCH v3] i2c: s3c2410: dont need CPU_FREQ transitions for
 exynos series

Naveen,

On Mon, Nov 18, 2013 at 10:18 PM, Naveen Krishna Chatradhi
<ch.naveen@...sung.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@...sung.com>
> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
> Reviewed-by: Doug Anderson <dianders@...omium.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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/