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>

diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
index cb6f55f24ccfbdc88c9f90bcd4d8ac2a4d6d3647..adadaf97ac01b78cf02c05d2e117ae181f1a09a0 100644 (file)
--- 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 {