Re: [PATCH RFC v6 2/9] PM / devfreq: Add generic imx bus scaling driver

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On 2019-11-20 08:30, Leonard Crestez wrote:
On 20.11.2019 17:41, Angus Ainslie wrote:
Hi Leonard,

On 2019-11-20 07:04, Leonard Crestez wrote:
On 20.11.2019 16:08, Angus Ainslie wrote:
Is "mainline ATF" an important criteria for Purism?

Yes we intend to bring all of our patches to mainline and were hoping
that NXP would be doing the same. Shouldn't a mainline kernel run on a
mainline ATF ?

You can still use mainline ATF (tested right now) but the imx8m-ddrc
driver won't probe.


Sorry I was talking about the DDR frequency scaling specifically.

The ability to mix and match different branches of firmware and kernel
is very useful for testing. There might be slight incompatibilities but
in theory if a feature depends on both firmware and kernel support then
it should gracefully degrade rather than crash or hang.

I saw the check you put in for the correct ATF version and that's very helpful thanks.


ATF support for this feature will be mainlined eventually, I picked the
linux side first because review is more challenging and changes are much
larger relative to what we have in our internal tree.


Do you have a patch against mainline ATF that we can test this feature with ?

Thanks
Angus

--
Regards,
Leonard



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