Introduce core voltage scaling for NVIDIA Tegra20/30 SoCs, which reduces power consumption and heating of the Tegra chips. Tegra SoC has multiple hardware units which belong to a core power domain of the SoC and share the core voltage. The voltage must be selected in accordance to a minimum requirement of every core hardware unit. The minimum core voltage requirement depends on: 1. Clock enable state of a hardware unit. 2. Clock frequency. 3. Unit's internal idling/active state. This series is tested on Acer A500 (T20), AC100 (T20), Nexus 7 (T30) and Ouya (T30) devices. I also added voltage scaling to the Ventana (T20) and Cardhu (T30) boards which are tested by NVIDIA's CI farm. Tegra30 is now up to 5C cooler on Nexus 7 and stays cool on Ouya (instead of becoming burning hot) while system is idling. It should be possible to improve this further by implementing a more advanced power management features for the kernel drivers. The DVFS support is opt-in for all boards, meaning that older DTBs will continue to work like they did it before this series. It should be possible to easily add the core voltage scaling support for Tegra114+ SoCs based on this grounding work later on, if anyone will want to implement it. WARNING(!) This series is made on top of the memory interconnect patches which are currently under review [1]. The Tegra EMC driver and devicetree-related patches need to be applied on top of the ICC series. [1] https://patchwork.ozlabs.org/project/linux-tegra/list/?series=212196 Dmitry Osipenko (30): dt-bindings: host1x: Document OPP and voltage regulator properties dt-bindings: mmc: tegra: Document OPP and voltage regulator properties dt-bindings: pwm: tegra: Document OPP and voltage regulator properties media: dt: bindings: tegra-vde: Document OPP and voltage regulator properties dt-binding: usb: ci-hdrc-usb2: Document OPP and voltage regulator properties dt-bindings: usb: tegra-ehci: Document OPP and voltage regulator properties soc/tegra: Add sync state API soc/tegra: regulators: Support Tegra SoC device sync state API soc/tegra: regulators: Fix lockup when voltage-spread is out of range regulator: Allow skipping disabled regulators in regulator_check_consumers() drm/tegra: dc: Support OPP and SoC core voltage scaling drm/tegra: gr2d: Correct swapped device-tree compatibles drm/tegra: gr2d: Support OPP and SoC core voltage scaling drm/tegra: gr3d: Support OPP and SoC core voltage scaling drm/tegra: hdmi: Support OPP and SoC core voltage scaling gpu: host1x: Support OPP and SoC core voltage scaling mmc: sdhci-tegra: Support OPP and core voltage scaling pwm: tegra: Support OPP and core voltage scaling media: staging: tegra-vde: Support OPP and SoC core voltage scaling usb: chipidea: tegra: Support OPP and SoC core voltage scaling usb: host: ehci-tegra: Support OPP and SoC core voltage scaling memory: tegra20-emc: Support Tegra SoC device state syncing memory: tegra30-emc: Support Tegra SoC device state syncing ARM: tegra: Add OPP tables for Tegra20 peripheral devices ARM: tegra: Add OPP tables for Tegra30 peripheral devices ARM: tegra: ventana: Add voltage supplies to DVFS-capable devices ARM: tegra: paz00: Add voltage supplies to DVFS-capable devices ARM: tegra: acer-a500: Add voltage supplies to DVFS-capable devices ARM: tegra: cardhu-a04: Add voltage supplies to DVFS-capable devices ARM: tegra: nexus7: Add voltage supplies to DVFS-capable devices .../display/tegra/nvidia,tegra20-host1x.txt | 56 +++ .../bindings/media/nvidia,tegra-vde.txt | 12 + .../bindings/mmc/nvidia,tegra20-sdhci.txt | 12 + .../bindings/pwm/nvidia,tegra20-pwm.txt | 13 + .../devicetree/bindings/usb/ci-hdrc-usb2.txt | 4 + .../bindings/usb/nvidia,tegra20-ehci.txt | 2 + .../boot/dts/tegra20-acer-a500-picasso.dts | 30 +- arch/arm/boot/dts/tegra20-paz00.dts | 40 +- .../arm/boot/dts/tegra20-peripherals-opp.dtsi | 386 ++++++++++++++++ arch/arm/boot/dts/tegra20-ventana.dts | 65 ++- arch/arm/boot/dts/tegra20.dtsi | 14 + .../tegra30-asus-nexus7-grouper-common.dtsi | 23 + arch/arm/boot/dts/tegra30-cardhu-a04.dts | 44 ++ .../arm/boot/dts/tegra30-peripherals-opp.dtsi | 415 ++++++++++++++++++ arch/arm/boot/dts/tegra30.dtsi | 13 + drivers/gpu/drm/tegra/Kconfig | 1 + drivers/gpu/drm/tegra/dc.c | 138 +++++- drivers/gpu/drm/tegra/dc.h | 5 + drivers/gpu/drm/tegra/gr2d.c | 140 +++++- drivers/gpu/drm/tegra/gr3d.c | 136 ++++++ drivers/gpu/drm/tegra/hdmi.c | 63 ++- drivers/gpu/host1x/Kconfig | 1 + drivers/gpu/host1x/dev.c | 87 ++++ drivers/memory/tegra/tegra20-emc.c | 8 +- drivers/memory/tegra/tegra30-emc.c | 8 +- drivers/mmc/host/Kconfig | 1 + drivers/mmc/host/sdhci-tegra.c | 70 ++- drivers/pwm/Kconfig | 1 + drivers/pwm/pwm-tegra.c | 84 +++- drivers/regulator/core.c | 12 +- .../soc/samsung/exynos-regulator-coupler.c | 2 +- drivers/soc/tegra/common.c | 152 ++++++- drivers/soc/tegra/regulators-tegra20.c | 25 +- drivers/soc/tegra/regulators-tegra30.c | 30 +- drivers/staging/media/tegra-vde/Kconfig | 1 + drivers/staging/media/tegra-vde/vde.c | 127 ++++++ drivers/staging/media/tegra-vde/vde.h | 1 + drivers/usb/chipidea/Kconfig | 1 + drivers/usb/chipidea/ci_hdrc_tegra.c | 79 ++++ drivers/usb/host/Kconfig | 1 + drivers/usb/host/ehci-tegra.c | 79 ++++ include/linux/regulator/coupler.h | 6 +- include/soc/tegra/common.h | 22 + 43 files changed, 2360 insertions(+), 50 deletions(-) -- 2.27.0 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel