From: Doug Anderson <dianders@chromium.org>
Date: Thu, 11 Sep 2014 04:30:15 +0000 (-0700)
Subject: ARM: dts: Switch i2c0 to 400kHz on rk3288-evb-rk808
X-Git-Tag: firefly_0821_release~176^2~3110^2~27^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0f4fc382428f71453d195925a3c63efc48452417;p=firefly-linux-kernel-4.4.55.git

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@chromium.org>
Reviewed-by Addy Ke <addy.ke@rock-chips.com>
Tested-by Addy Ke <addy.ke@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
---

diff --git a/arch/arm/boot/dts/rk3288-evb-rk808.dts b/arch/arm/boot/dts/rk3288-evb-rk808.dts
index 36db177f6a5a..ff522f8e3df4 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 {