Re: [PATCH] arm64: dts: add all hi6220 uart nodes

[Leo Yan <leo.yan-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

Hi Tyler, Mark,

On Wed, Sep 30, 2015 at 04:54:51PM -0700, Tyler Baker wrote:
> On 30 September 2015 at 12:18, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> > On Wed, Sep 30, 2015 at 11:12:58AM -0700, Tyler Baker wrote:
> >> On 30 September 2015 at 10:31, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> >
> >> + Peter as he has been submitting u-boot patches recently for the HiKey.
> >
> >> Obviously, both UEFI and u-boot can be configured to use either UART,
> >> and at the moment u-boot defaults to using the on board UART. Whereas
> >> UEFI is using UART1 on the LS connector. I'm fine with switching the
> >> console default to use the UART1 on the LS connector as long as there
> >> is agreement to do so.
> >
> > Given that UEFI is switching and the requirement for soldering to get to
> > the on board UART it does seem to make sense, though it will create some
> > pain for current users.
> >
> >> > While we're at it there was a recent talk which mentioned a fairly large
> >> > amount of functionality that's apparently already "upstream" for this
> >> > device but not included in the DT, assuming that means that driver
> >> > support is there it would be good to add the corresponding DT.
> >
> >> Indeed, I think this comment is targeted to toward the d410c though as
> >> there are drivers for eMMC, and microsd drivers upstream but no DT
> >> bindings. I do not believe currently this is the case for HiKey.
> >
> > My understanding is that it applies to both with slightly different
> > driver sets, the slides aren't online yet (!) but if you look at 10:52
> > or so in the video we should have SD/eMMC on HiKey in v4.1 with thermal
> > and CPUfreq added in v4.2.  It also looks like there's just some DT
> > additions needed to enable reset, cpuidle and CPU hotplug using generic
> > code (mainly the constants for PSCI I expect).
> 
> I just skimmed the video and I see your point. I'll need to
> investigate a bit but I'm up for sending some follow up patches to get
> these drivers functioning. First lets get the UART working :)

For Hikey's PM, related patches are ready for upstreaming [1].

Previously i'm waiting for merging mailbox driver, after that i plan
to send out all DT patches to enable cpuidle/cpufreq/thermal/suspend
in one going. Now pending on mailbox driver's merging.

If you think it's necessary, i could send out patches to enable cpuidle
firstly (actually now PSCI has been enabled yet); for cpufreq and
thermal features, need wait until mailbox driver has been merged.

[1] https://github.com/Leo-Yan/linux/commits/tracking-hikey-pm

Thanks,
Leo Yan
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