[PATCH RFC] ARM: EXYNOS5: Setup legacy i2c controller interrupts on SMDK5250

[Abhilash Kesavan]

Hi Thomas,

Thanks for the suggestions.

On Tue, Nov 6, 2012 at 1:45 PM, Thomas Abraham
<thomas.abraham at linaro.org> wrote:
> On 6 November 2012 11:48, Abhilash Kesavan <a.kesavan at samsung.com> wrote:
>> On Exynos5 we have a new high-speed i2c controller. The interrupt
>> sources for the legacy and new controller are muxed and are controlled
>> via the SYSCON I2C_CFG register.
>> At reset the interrupt source is configured for the high-speed controller,
>> to continue using the old i2c controller we need to modify the I2C_CFG
>> register.
>
> If the high-speed i2c controllers are not used, can this configuration
> be moved into the bootloader?
>
> The other option could be, in the exynos5250_dt_machine_init()
> function, first check if the platform is compatible with
> "samsung,exynos5250" and if so search for a high-speed i2c controller
> compatible node. If a high-speed controller node is found and if that
> node is not disabled, then do not change the reset value of I2C_CFG
> register.
>
I'd like to try this out. Do we have to a scenario where both hs-i2c and legacy
i2c nodes are added to the dts file without disabling either of them or is it
expected that one of these will always be disabled in the board-specific
dts file (as only one can work at a time) ?

> Thanks,
> Thomas.
>