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

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:
[...]

quoted

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.

   Andrew