On 16.07.2014 10:50, Daniel Drake wrote:
> 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@xxxxxxxxxxxx>
> ---
> 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 cb6f55f..adadaf9 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 {
>
Reviewed-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
--
Best regards,
Tomasz
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