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On some SoCs the Adaptive Voltage Scaling (AVS) technique is employed to optimize the operating voltage of a device. At a given frequency, the hardware monitors dynamic factors and either makes a suggestion for how much to adjust a voltage for the current frequency, or it automatically adjusts the voltage without software intervention. Add an API to the OPP library for the former case, so that AVS type devices can update the voltages for an OPP when the hardware determines the voltage should change. The assumption is that drivers like CPUfreq or devfreq will register for the OPP notifiers and adjust the voltage according to suggestions that AVS makes. This patch is derived from [1] submitted by Stephen. [1] https://lore.kernel.org/patchwork/patch/599279/ Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> [Roger Lu: Changed to rcu less implementation] Signed-off-by: Roger Lu <roger.lu@mediatek.com> [s.nawrocki@samsung.com: added handling of OPP min/max voltage] Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> |
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| .. | ||
| core.c | ||
| cpu.c | ||
| debugfs.c | ||
| Kconfig | ||
| Makefile | ||
| of.c | ||
| opp.h | ||
| ti-opp-supply.c | ||