[PATCH v2 0/3] Support regulators coupling on NVIDIA Tegra20/30

Dmitry Osipenko
2019-07-25T15:21:00Z

Hello,

The voltage regulators need to be coupled on NVIDIA Tegra20 and Tegra30
SoCs in order to provide voltage scaling functionality in a generic way.
All necessary regulator-core patches that added support for the regulators
coupling are already have been merge into mainline kernel. This series
adds customized voltage couplers for Tegra20/30 SoCs, paving the way for
a refined CPUFreq driver that will utilize voltage scaling and other neat
features. This is a resend of a leftover patches from a previous series
[1] that was partially applied by Mark Brown. Please review, thanks in
advance!

[1] https://patchwork.ozlabs.org/project/linux-tegra/list/?series=115626

Changelog:

v2: - Some days ago OPP framework got a change that makes CPU regulator
to be enabled at the time of CPUFreq's driver initializing OPPs.
In a result the CPU's voltage is dropped to a minimum value on
CPUFreq's setting up because there are no consumers at the time
of regulator's enabling, thus CPU is getting into a big trouble.
This problem is now resolved in the couplers code by assuming
that min_uV=current_uV for CPU's regulator if it doesn't have
any active consumers.

Dmitry Osipenko (3):
dt-bindings: regulator: Document regulators coupling of NVIDIA
Tegra20/30 SoCs
soc/tegra: regulators: Add regulators coupler for Tegra20
soc/tegra: regulators: Add regulators coupler for Tegra30

.../nvidia,tegra-regulators-coupling.txt | 65 ++++
drivers/soc/tegra/Kconfig | 10 +
drivers/soc/tegra/Makefile | 2 +
drivers/soc/tegra/regulators-tegra20.c | 364 ++++++++++++++++++
drivers/soc/tegra/regulators-tegra30.c | 316 +++++++++++++++
5 files changed, 757 insertions(+)
create mode 100644 Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt
create mode 100644 drivers/soc/tegra/regulators-tegra20.c
create mode 100644 drivers/soc/tegra/regulators-tegra30.c

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