[PATCH 2/6] ARM: Tegra: Add CPU's OPPs for using cpufreq-cpu0 driver

On Thu, Aug 8, 2013 at 9:37 AM, Viresh Kumar [off-list ref] wrote:

On 8 August 2013 19:52, Lucas Stach [off-list ref] wrote:

quoted

You can certainly define the mapping table in DT where a specialized
Tegra cpufreq driver could read it in and then map frequency to voltage.
But that's a runtime decision, as Speedo and process ID are fuse values
and can not be represented in DT.

quoted

The problem with this is that the hardware description now associates
voltages with certain frequencies and even if they are not used by the
Linux driver they are plain wrong.

Hmm. I understand.
Then we probably need mach-tegra/opp.c to call opp_add() for all such
OPPs.. Neither DT nor cpufreq driver are the right place for this.

This is similar to what I suspected might be the case on other
platforms (in addition to known iMx and OMAP). Could you see/comment
on [1] to see if it meets your needs.

We should like to avoid dealing custom SoC specific OPP, if we are
able to generalize the need.  ofcourse, I am yet to submit a official
proposal, but more SoCs the current proposal can handle, the better it
will be for all of us.

[1] http://marc.info/?l=linux-pm&m=137589225305971&w=2
--
Regards,
Nishanth Menon