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PM: domains: Add support for 'required-opps' to set default perf state

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Some devices within power domains with performance states do not
support DVFS, but still need to vote on a default/static state
while they are active. They can express this using the 'required-opps'
property in device tree, which points to the phandle of the OPP
supported by the corresponding power-domains.

Add support to parse this information from DT and then set the
specified performance state during attach and drop it on detach.
runtime suspend/resume callbacks already have logic to drop/set
the vote as needed and should take care of dropping the default
perf state vote on runtime suspend and restore it back on runtime
resume.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rajendra Nayak 2021-08-12 16:57:21 +05:30 • committed by Rafael J. Wysocki
parent 020d86fc0d
commit c016baf7dc
2 changed files with 29 additions and 2 deletions
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1
include/linux/pm_domain.h
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@ -198,6 +198,7 @@ struct generic_pm_domain_data {
struct notifier_block *power_nb;
int cpu;
unsigned int performance_state;
unsigned int default_pstate;
unsigned int rpm_pstate;
ktime_t next_wakeup;
void *data;