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authorDaniel Drake <drake@endlessm.com>2014-08-18 11:39:53 -0500
committerKukjin Kim <kgene.kim@samsung.com>2014-08-18 11:39:53 -0500
commitcc3fe7abda0abb9936598a90feaa2e323d62200d (patch)
tree29f0f50fcecc71d548e07fde53a1c62f1779ea23 /arch/arm/boot/dts
parenteea6653aae7bc85e38104f9c3a22471cba04da68 (diff)
ARM: dts: ODROID i2c improvements for exynos4412-odroid-common
Increase max i2c bus frequency beyond the default for faster data transfers. According to the manual, these faster speeds are only available when the board is wired up the right way. In this case, the vendor kernel has run at this speed for a long time. sda-delay is needed for talking to RTC on PMIC, otherwise the i2c controller never sees an ACK. Strangely the other PMIC i2c slave (the main one) works fine even without this delay. I Chose value 100 to match the vendor kernel. Signed-off-by: Daniel Drake <drake@endlessm.com> Reviewed-by: Tomasz Figa <t.figa@samsung.com> Tested-by: Tomeu Vizoso <tomeu@tomeuvizoso.net> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/boot/dts')
-rw-r--r--arch/arm/boot/dts/exynos4412-odroid-common.dtsi2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
index cb6f55f24ccf..adadaf97ac01 100644
--- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
+++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
@@ -134,6 +134,8 @@
i2c@13860000 {
pinctrl-0 = <&i2c0_bus>;
pinctrl-names = "default";
+ samsung,i2c-sda-delay = <100>;
+ samsung,i2c-max-bus-freq = <400000>;
status = "okay";
usb3503: usb3503@08 {