From: Addy <addy.ke-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
To: Doug Anderson <dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
Heiko Stuebner <heiko-4mtYJXux2i+zQB+pC5nmwQ@public.gmane.org>
Cc: Chris Zhong <zyw-TNX95d0MmH7DzftRWevZcw@public.gmane.org>,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
pawel.moll-5wv7dgnIgG8@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org,
galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org,
linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
Date: Thu, 11 Sep 2014 17:17:58 +0800 [thread overview]
Message-ID: <541168C6.2090603@rock-chips.com> (raw)
In-Reply-To: <1410409815-22200-1-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
On 11 Sep 2014 12:30, Doug Anderson writes:
> We should be able to talk to the PMIC at 400kHz. No need to talk at
> the slow 100kHz.
>
> As measured by ftrace (with a bunch of extra patches, since cpufreq
> for rk808 hasn't landed yet):
> before this change: cpu0_set_target() => ~500us
> after this change: cpu0_set_target() => ~300us
>
> Signed-off-by: Doug Anderson <dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
> ---
> arch/arm/boot/dts/rk3288-evb-rk808.dts | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts b/arch/arm/boot/dts/rk3288-evb-rk808.dts
> index 36db177..ff522f8 100644
> --- a/arch/arm/boot/dts/rk3288-evb-rk808.dts
> +++ b/arch/arm/boot/dts/rk3288-evb-rk808.dts
> @@ -18,6 +18,7 @@
> };
>
> &i2c0 {
> + clock-frequency = <400000>;
> status = "okay";
>
> rk808: pmic@1b {
I have tested on rk3288-pinky board, it work well. so
Reviewed-by Addy Ke <addy.ke-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
Tested-by Addy Ke <addy.ke-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
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next prev parent reply other threads:[~2014-09-11 9:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-11 4:30 [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808 Doug Anderson
[not found] ` <1410409815-22200-1-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2014-09-11 9:17 ` Addy [this message]
2014-09-11 9:23 ` Heiko Stübner
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