On 02/12/2021 15:42, Ulf Hansson wrote: > On Wed, 1 Dec 2021 at 17:41, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> wrote: >> >> The proposed bindings are describing a set of powerzones. >> >> A power zone is the logical name for a component which is capable of >> power capping and where we can measure the power consumption. >> >> A power zone can aggregate several power zones in terms of power >> measurement and power limitations. That allows to apply power >> constraint to a group of components and let the system balance the >> allocated power in order to comply with the constraint. >> >> The ARM System Control and Management Interface (SCMI) can provide a >> power zone description. >> >> The powerzone semantic is also found on the Intel platform with the >> RAPL register. >> >> The Linux kernel powercap framework deals with the powerzones: >> >> https://www.kernel.org/doc/html/latest/power/powercap/powercap.html >> >> The powerzone can also represent a group of children powerzones, hence >> the description can result on a hierarchy. Such hierarchy already >> exists with the hardware or can be represented and computed from the >> kernel. >> >> The hierarchical description was initially proposed but not desired >> given there are other descriptions like the power domain proposing >> almost the same description. >> >> https://lore.kernel.org/all/CAL_JsqLuLcHj7525tTUmh7pLqe7T2j6UcznyhV7joS8ipyb_VQ@xxxxxxxxxxxxxx/ >> >> The description gives the power constraint dependencies to apply on a >> specific group of logically or physically aggregated devices. They do >> not represent the physical location or the power domains of the SoC >> even if the description could be similar. >> >> Cc: Arnd Bergmann <arnd@xxxxxxxx> >> Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx> >> Cc: Rob Herring <robh+dt@xxxxxxxxxx> >> Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> > > This looks good to me, feel free to add: > > Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> Thanks Ulf for your time to review these bindings -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
