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Subject[PATCH v2 2/5] cpufreq: dt: Register an Energy Model
Date
Now that PM_OPP provides a helper function to estimate the power
consumed by CPUs, make sure to try and register an Energy Model (EM)
from cpufreq-dt, hence ensuring interested subsystems (the task
scheduler, for example) can make use of that information when available.

Signed-off-by: Quentin Perret <quentin.perret@arm.com>
---
drivers/cpufreq/cpufreq-dt.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index e58bfcb1169e..1d4ad6f67408 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -160,7 +160,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
unsigned int transition_latency;
bool fallback = false;
const char *name;
- int ret;
+ int ret, nr_opp;

cpu_dev = get_cpu_device(policy->cpu);
if (!cpu_dev) {
@@ -231,8 +231,8 @@ static int cpufreq_init(struct cpufreq_policy *policy)
* But we need OPP table to function so if it is not there let's
* give platform code chance to provide it for us.
*/
- ret = dev_pm_opp_get_opp_count(cpu_dev);
- if (ret <= 0) {
+ nr_opp = dev_pm_opp_get_opp_count(cpu_dev);
+ if (nr_opp <= 0) {
dev_dbg(cpu_dev, "OPP table is not ready, deferring probe\n");
ret = -EPROBE_DEFER;
goto out_free_opp;
@@ -280,6 +280,8 @@ static int cpufreq_init(struct cpufreq_policy *policy)
policy->cpuinfo.transition_latency = transition_latency;
policy->dvfs_possible_from_any_cpu = true;

+ dev_pm_opp_of_register_em(policy->cpus, nr_opp);
+
return 0;

out_free_cpufreq_table:
--
2.20.1
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