occ: Add pstate corresponding to base frequency to DT

Unlike POWER8, nominal frequency is not the highest guaranteed
frequency of the POWER9 chip. In POWER9, the highest guaranteed
frequency is greater than the nominal frequency and is referred
to as base frequency. In POWER9 base frequency is the highest
frequency the processor will operate at when ALL cores are active
and in ANY operating condition. This patch exports the turbo pstate
as the base frequency as per OCC documentation.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
[oliver: delete ibm,pstate-base on fast reboot]
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/hw/occ.c b/hw/occ.c
index f054379..db2744f 100644
--- a/hw/occ.c
+++ b/hw/occ.c
@@ -703,6 +703,7 @@ static bool add_cpu_pstate_properties(struct dt_node *power_mgt,
 		dt_add_property(power_mgt, "ibm,pstate-core-max", dt_cmax,
 				nr_cores * sizeof(u32));
 
+		dt_add_property_cells(power_mgt, "ibm,pstate-base", pturbo);
 		free(dt_cmax);
 	}
 
@@ -1747,6 +1748,7 @@ void occ_pstates_init(void)
 				"ibm,pstate-nominal",
 				"ibm,pstate-turbo",
 				"ibm,pstate-ultra-turbo",
+				"ibm,pstate-base",
 				"#address-cells",
 				"#size-cells",
 				};