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a65a397f24
When the hierarchical CPU topology layout is used in DT and the PSCI OSI mode is supported by the PSCI FW, let's initialize a corresponding PM domain topology by using genpd. This enables a CPU and a group of CPUs, when attached to the topology, to be power-managed accordingly. To trigger the attempt to initialize the genpd data structures let's use a subsys_initcall, which should be early enough to allow CPUs, but also other devices to be attached. The initialization consists of parsing the PSCI OF node for the topology and the "domain idle states" DT bindings. In case the idle states are compatible with "domain-idle-state", the initialized genpd becomes responsible of selecting an idle state for the PM domain, via assigning it a genpd governor. Note that, a successful initialization of the genpd data structures, is followed by a call to psci_set_osi_mode(), as to try to enable the OSI mode in the PSCI FW. In case this fails, we fall back into a degraded mode rather than bailing out and returning error codes. Co-developed-by: Lina Iyer <lina.iyer@linaro.org> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Rafael J. Wysocki <rafael@kernel.org>
18 lines
437 B
C
18 lines
437 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __CPUIDLE_PSCI_H
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#define __CPUIDLE_PSCI_H
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struct device_node;
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void psci_set_domain_state(u32 state);
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int __init psci_dt_parse_state_node(struct device_node *np, u32 *state);
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#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
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struct device __init *psci_dt_attach_cpu(int cpu);
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#else
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static inline struct device __init *psci_dt_attach_cpu(int cpu) { return NULL; }
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#endif
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#endif /* __CPUIDLE_PSCI_H */
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