[PATCH 2/8] cpufreq: add driver for Armada XP

Andrew Lunn andrew at lunn.ch
Fri Jul 4 07:15:41 PDT 2014

On Fri, Jul 04, 2014 at 03:52:14PM +0200, Lucas Stach wrote:
> Am Freitag, den 04.07.2014, 13:12 +0200 schrieb Thomas Petazzoni:
> [...]
> > This doesn't work very well with the idea of having the OPP table
> > statically encoded in to the Device Tree. Options are:
> > 
> >  - Improve the cpufreq-cpu0 driver so that the OPP table can be passed
> >    through platform_data, and therefore built dynamically by the
> >    platform code and passed when registering the cpufreq
> >    platform_device.
> > 
> >  - Dynamically build/update the OPP table in the Device Tree.
> This sounds like the right thing to do. Ideally your bootloader would do
> this for you, so you don't have to encode those properties statically at
> all.
> Barebox already has facilities to fixup any loaded device tree. Have a
> look at of_register_fixup() there.

We are talking about legacy devices here, which have been in the field
for years. There is very little chance of a boot loader
upgrade. Appended DT is the norm for these devices, and modifying the
DT would have to happen in kernel.


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