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Message-Id: <1410409815-22200-1-git-send-email-dianders@chromium.org>
Date: Wed, 10 Sep 2014 21:30:15 -0700
From: Doug Anderson <dianders@...omium.org>
To: Heiko Stuebner <heiko@...ech.de>
Cc: Chris Zhong <zyw@...k-chips.com>, Addy Ke <addy.ke@...k-chips.com>,
linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org,
Doug Anderson <dianders@...omium.org>, robh+dt@...nel.org,
pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
linux@....linux.org.uk, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
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@...omium.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
--
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