[U-Boot] Add support for imxrt

[Giulio Benetti]

Hi Stefano and Fabio,

On 9/11/19 8:50 AM, Stefano Babic wrote:
> Hi Giulio,
> 
> On 10/09/19 20:32, Giulio Benetti wrote:
>> Hello everybody,
>>
>> I would like to port imxrt to u-boot and I would like to ask you:
>> - do you have the interest on upstreaming it?
>> if yes:
>> I've seen how they've dealt with 'stm32' and 'stm32mp' that is similar
>> to 'imxrt' and 'imx'. So should follow the same criterias for porting? I
>> mean adding the new folder 'mach-imxrt'?
> 
> Agree - we should follow the same schema.

While porting IMXRT I'm realizing that things would fit better if adding 
to mach-imx folder. This is because IMXRT has a lot in common with imx 
on low level side, i.e. iomux, clock. So I would go for mach-imx instead 
of mach-imxrt, is it ok?

But then I can't understand if going on trying to initialize everything 
through dts, even on SPL, or trying to imitate how other imx work, i.e. 
imx6 where they directly call low-level functions(iomuxc etc.) in board 
init.
Which approach would be better for you all?

I wait for your answer

Thanks in advance
Kind regards
-- 
Giulio Benetti
Benetti Engineering sas