From 95d516b9fca8ce77d6babd0c35513e7354441e7d Mon Sep 17 00:00:00 2001 From: Daniel Drake Date: Wed, 16 Jul 2014 09:50:06 +0100 Subject: [PATCH] ARM: dts: ODROID i2c improvements 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 Reviewed-by: Tomasz Figa Tested-by: Tomeu Vizoso Signed-off-by: Olof Johansson --- arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 2 ++ 1 file changed, 2 insertions(+) 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 {