On Fri, 06 Dec 2024 22:11:24 +0100, Christian Marangi wrote: > On newer Airoha SoC, CPU Frequency is scaled indirectly with SMC commands > to ATF. > > A virtual clock is exposed. This virtual clock is a get-only clock and > is used to expose the current global CPU clock. The frequency info comes > by the output of the SMC command that reports the clock in MHz. > > The SMC sets the CPU clock by providing an index, this is modelled as > performance states in a power domain. > > CPUs can't be individually scaled as the CPU frequency is shared across > all CPUs and is global. > > Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx> > Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> > --- > Changes v7: > - Add more info to the description for usage of clock and > performance-domain > - Drop redundant nodes from example > Changes v6: > - No changes > Changes v5: > - Add Reviewed-by tag > - Fix OPP node name error > - Rename cpufreq node name to power-domain > - Rename CPU node power domain name to perf > - Add model and compatible to example > Changes v4: > - Add this patch > > .../cpufreq/airoha,en7581-cpufreq.yaml | 55 +++++++++++++++++++ > 1 file changed, 55 insertions(+) > create mode 100644 Documentation/devicetree/bindings/cpufreq/airoha,en7581-cpufreq.yaml > Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>
