* [RFD] DT binding for a new CPU cooling device
@ 2019-12-13 17:32 Daniel Lezcano
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From: Daniel Lezcano @ 2019-12-13 17:32 UTC (permalink / raw)
To: Rob Herring, Linux Kernel Mailing List; +Cc: Linus Walleij
Hi,
currently the binding for a cooling device associated with a thermal
zone is a phandle to the cooling device itself, like:
cooling-device = <&cpu0 0 2>;
cooling-device = <&gpu0 0 2>;
cooling-device = <&lcd0 5 10>;
cooling-device = <&fan0 THERMAL_NO_LIMIT 4>;
In the case of the cpu, now we can mitigate by injecting idle period [1]
and this can co-exist with the existing DVFS mitigation (at different
trip point).
As it is not possible to use also a phandle to a CPU because the binding
is used by the DVFS cpu cooling device, does it make sense to refer to
an idle state? like:
cooling-device = <&CPU_SLEEP THERMAL_NO_LIMITE THERMAL_NO_LIMIT>;
Thanks in advance for any advice
-- Daniel
[1] https://lkml.org/lkml/2019/12/11/1902
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