I had a long chat with Rajendra offline and clarified few things..
On 08-05-17, 11:06, Rajendra Nayak wrote:
On 05/08/2017 09:45 AM, Viresh Kumar wrote:
On 06-05-17, 11:58, Kevin Hilman wrote:
I had the same question. Seems the same comment about an abstract "index" is needed for voltage also.
Why should we do that? Here are the cases that I had in mind while writing this:
DT only contains the performance-index and nothing else (i.e. voltages aren't exposed).
We wouldn't be required to fill the microvolt property as it is optional.
So the performance-index is specified in opp-hz property?
Yes, but in the OPP table of the power-domain and not the device. The device can still have its own OPP table with normal freq/voltage values (for a separate regulator).
What if the microcontroller firmware maps the performance-index to voltage but expects linux to scale the frequency?
As you clarified on the chat, you were talking about the device here. It isn't a problem as we will have two separate tables here, one for the device and one for the domain.