power-mgmt : occ : Add 'freq-domain-mask' DT property

Add a new device-tree property freq-domain-indicator to define group of
CPUs which would share same frequency. This property has been added under
power-mgmt node. It is a bitmask.

Bitwise AND is taken between this bitmask value and PIR of cpu. All the
CPUs lying in the same frequency domain will have same result for AND.

For example, For POWER9, 0xFFF0 indicates quad wide frequency domain.
Taking AND with the PIR of CPUs will yield us frequency domain which is
quad wise distribution as last 4 bits have been masked which represent the
cores.

Similarly, 0xFFF8 will represent core wide frequency domain for P8.

Also, Add a new device-tree property domain-runs-at which will denote the
strategy OCC is using to change the frequency of a frequency-domain. There
can be two strategy - FREQ_MOST_RECENTLY_SET and FREQ_MAX_IN_DOMAIN.

FREQ_MOST_RECENTLY_SET : the OCC sets the frequency of the quad to the most
recent frequency value requested by the CPUs in the quad.

FREQ_MAX_IN_DOMAIN : the OCC sets the frequency of the CPUs in
the Quad to the maximum of the latest frequency requested by each of
the component cores.

Signed-off-by: Abhishek Goel <huntbag@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

0 files changed, 0 insertions, 0 deletions