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authorDaniel Drake <drake@endlessm.com>2014-07-16 09:50:06 +0100
committerOlof Johansson <olof@lixom.net>2014-08-19 14:12:30 -0700
commit95d516b9fca8ce77d6babd0c35513e7354441e7d (patch)
tree24e2aead8d897a47c21abd339d43b1bb2836a713
parent4cde3733daa044961cdd3b9be63eee73c8b34589 (diff)
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 <drake@endlessm.com> Reviewed-by: Tomasz Figa <t.figa@samsung.com> Tested-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> Signed-off-by: Olof Johansson <olof@lixom.net>
-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 {