From: heiko@sntech.de (Heiko Stübner)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
Date: Thu, 11 Sep 2014 11:23:47 +0200 [thread overview]
Message-ID: <14543621.jVTOtFDFto@diego> (raw)
In-Reply-To: <1410409815-22200-1-git-send-email-dianders@chromium.org>
Am Mittwoch, 10. September 2014, 21:30:15 schrieb Doug Anderson:
> 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@chromium.org>
looks harmless :-)
I've added it to my v3.18-next/dts branch with Addy's tags
> ---
> 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 at 1b {
WARNING: multiple messages have this Message-ID (diff)
From: "Heiko Stübner" <heiko@sntech.de>
To: Doug Anderson <dianders@chromium.org>
Cc: Chris Zhong <zyw@rock-chips.com>,
Addy Ke <addy.ke@rock-chips.com>,
linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org, robh+dt@kernel.org,
pawel.moll@arm.com, mark.rutland@arm.com,
ijc+devicetree@hellion.org.uk, galak@codeaurora.org,
linux@arm.linux.org.uk, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
Date: Thu, 11 Sep 2014 11:23:47 +0200 [thread overview]
Message-ID: <14543621.jVTOtFDFto@diego> (raw)
In-Reply-To: <1410409815-22200-1-git-send-email-dianders@chromium.org>
Am Mittwoch, 10. September 2014, 21:30:15 schrieb Doug Anderson:
> 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@chromium.org>
looks harmless :-)
I've added it to my v3.18-next/dts branch with Addy's tags
> ---
> 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 {
next prev parent reply other threads:[~2014-09-11 9:23 UTC|newest]
Thread overview: 7+ 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
2014-09-11 4:30 ` Doug Anderson
2014-09-11 9:17 ` Addy
2014-09-11 9:17 ` Addy
2014-09-11 9:17 ` Addy
2014-09-11 9:23 ` Heiko Stübner [this message]
2014-09-11 9:23 ` Heiko Stübner
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