Add GENPD driver for the core power domain of NVIDIA Tegra SoCs. It's needed for enabling of SoC core voltage scaling, resolving overheating problems of the Tegra SoCs. Note that this series is made on top of [1]. It doesn't have any other dependencies, core PD and voltage scaling will become active once all other related patches will be applied, meaning that this series could be applied at any time. [1] https://patchwork.ozlabs.org/project/linux-tegra/list/?series=244075 These and other power-related patches got more testing on more devices, like Transformer and Lenovo tablets. I haven't updated tested-bys since these devices are out-of-tree yet. Ouya Tegra30 game console runs at 40C during system idle in oppose to going over 60C with the enabled core voltage scaling. Matt Merhar collected temperature stats on his Ouya [2], showing a very significant improvement. [2] https://imgur.com/a/z4NDWqk Changelog: v5: - The core power domain node is now placed within the PMC PDs. This was suggested by Thierry Reding to v4, we don't need to add a virtual device-tree node for the domain anymore. v4: - Rebased on top of a new version of the OPP patches [1]. - Fixed new DT binding warning which was reported by the bot for v3. v3: - This series is a continuation of [3][4]. I factored out and grouped these soc/tegra patches since they have a common dependency on the OPP API patches [1] and the rest of PM patches depend on this series. [3] https://lore.kernel.org/lkml/20201217180638.22748-1-digetx@xxxxxxxxx/ [4] https://lore.kernel.org/linux-pm/20210121191410.13781-1-digetx@xxxxxxxxx/ - Added locking around regulators syncing, which was previously done by the OPP core, but then we (me and Viresh) figured out that it will be better to do it within the PD driver. - The Core-PD driver now restores the boot voltage level before shutdown/reboot, which may help some devices not to hang on reboot, like Nexus 7 for example. - Added r-b from Ulf Hansson to "regulators: Support Core domain state syncing" patch, which he gave to v2. - It should be cleaner to add the Core OPP tables and power domain to the device-trees once all drivers will get the PM support, so this series adds the driver and the binding for now. - Added t-b from Paul Fertser, who tested the complete patchset on his AC100 netbook and helped to spot compatibility problem with older DTBs in the patch that will add PM support to the GPU driver. - The DT binding now follows the power-domain spec, which was suggested by Krzysztof Kozlowski in his comment to v2. Dmitry Osipenko (3): dt-bindings: soc: tegra-pmc: Document core power domain soc/tegra: pmc: Add core power domain soc/tegra: regulators: Support Core domain state syncing .../arm/tegra/nvidia,tegra20-pmc.yaml | 35 +++++ drivers/soc/tegra/Kconfig | 14 ++ drivers/soc/tegra/pmc.c | 143 ++++++++++++++++++ drivers/soc/tegra/regulators-tegra20.c | 19 ++- drivers/soc/tegra/regulators-tegra30.c | 18 ++- include/soc/tegra/common.h | 6 + 6 files changed, 233 insertions(+), 2 deletions(-) -- 2.30.2
