From: Doug Anderson <dianders@chromium.org>
To: Heiko Stuebner <heiko@sntech.de>
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,
Doug Anderson <dianders@chromium.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: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
Date: Wed, 10 Sep 2014 21:30:15 -0700 [thread overview]
Message-ID: <1410409815-22200-1-git-send-email-dianders@chromium.org> (raw)
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>
---
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 {
--
2.1.0.rc2.206.gedb03e5
next reply other threads:[~2014-09-11 4:30 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-11 4:30 Doug Anderson [this message]
[not found] ` <1410409815-22200-1-git-send-email-dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2014-09-11 9:17 ` [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808 Addy
2014-09-11 9:23 ` Heiko Stübner
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