lkml.org 
[lkml]   [2013]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [PATCH 2/6] ARM: Tegra: Add CPU's OPPs for using cpufreq-cpu0 driver
    From
    On 8 August 2013 19:28, Lucas Stach <l.stach@pengutronix.de> wrote:
    > From what I learned those voltage levels are dependent on both the
    > Speedo and the process ID of the specific Tegra processor. So you really
    > get a two dimensional mapping table instead of a single OPP.
    > Also you can not scale the CPU voltage on it's own, but have to make
    > sure the core voltage isn't too far away from. Then core voltage also
    > depends on the operating states of engines like GR2D or even display.

    So if they depend on a certain type of SoC, which they should, then we
    can get these initialized from that SoC's dts/dtsi file instead of a common
    file.. And so that would resolve the issue you just reported.

    Now I haven't proposed in the patch that we will change these voltage
    levels at all.. This is regulator specific code and would come into play
    only when regulators are registered for cpu.. Otherwise we will just
    play with frequency..

    Passing OPP instead of just list of frequencies is the generic way this
    is done now a days..


    \
     
     \ /
      Last update: 2013-08-08 19:01    [W:2.341 / U:0.156 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site