Re: OMAP3 DM3730 1GHz mainline support

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* Adam Ford <aford173@xxxxxxxxx> [161215 07:53]:
> On Thu, Dec 15, 2016 at 9:40 AM, Tony Lindgren <tony@xxxxxxxxxxx> wrote:
> > * Adam Ford <aford173@xxxxxxxxx> [161215 07:27]:
> >> On Thu, Dec 15, 2016 at 2:44 AM, Daniel Gomez <dgomez@xxxxxxxxxxx> wrote:
> >> > Thanks for your answer Tony,
> >> >
> >> > I would like to fix it but I don't know how to start. Any idea or
> >> > suggestion please?
> >> > I have patched kernel 4.3 with this patch with the same result:
> >> > http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/294018.html
> >> >
> >> > Furthermore, which kernel version is recommended to be use?
> >> >
> >> > Daniel
> >> >
> >> > 2016-12-14 20:52 GMT+01:00 Tony Lindgren <tony@xxxxxxxxxxx>:
> >> >>
> >> >> * Daniel Gomez <dgomez@xxxxxxxxxxx> [161214 08:14]:
> >> >> > HI,
> >> >> >
> >> >> > I would like to know about the status for supporting 1GHz of DM3730
> >> >> > processor (omap3) in the kernel mainline.
> >> >>
> >> >> Yeah unfortunately the voltdomain support is still missing. Somebody
> >> >> just needs to fix it..
> >> >>
> >>
> >> I modified the om36xx.dtsi file to list 1000000 and 1375000 uV, but I
> >> couldn't figure out how to autodetect whether or not the
> >> DM3730/OMAP3630 was 800MHz or 1000.
> >>
> >> I was also told we should be running Smartreflex 1.5 (not 3), but I
> >> wasn't very successful in integrating the SR 1.5 patch to a modern
> >> kernel (but I didn't spend much time on it).
> >>
> >> From my understanding we need to have ABB, but it seems to
> >> semi-working on my 4.9 kernel.  The min and max microvolts appear to
> >> be correct, but the microvolts reading is returning -22, so I think
> >> there might be something more remaining.
> >
> > Probably the version of smartreflex 1.5 patch to look at is the old
> > Nokia n9/n950 tree.
> >
> 
> Looking at Smartreflex 2 in the 4.9 kernel, it shows:
> V2 is the update for the 45nm version of the IP used in OMAP3630 and OMAP4430
> 
> Based on that, is porting 1.5 really necessary?  My understanding is
> that the DM3730 and the OMAP3630 are basically the same thing.

Yes dm3730 is same as omap3630. So yeah maybe 1.5 is only needed for 34xx?

Tony
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