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Subject[PATCH RFC 0/8] Exynos Adaptive Supply Voltage support
Date
The Adaptive Supply Voltage (ASV) on Exynos SoCs is a technique of adjusting
subsystem operating points, i.e. power supply voltage for given clock
frequency, in order to better match actual capabilities of the hardware
and optimize power consumption. This applies to subsystems of the SoC like:
CPU clusters, GPU, the memory controller or camera ISP. During production
process the SoC chip is assigned to one of several bins (ASV groups) and
the group information is encoded in the SoC CHIPID block registers and/or
OTP memory. This information is then used to select more finely matching
operating points for devices.

The motivation of this patch set was, amongst others, to ensure proper
Odroid XU3/XU4 operation with highest performance operating points.

This patch set adds a driver parsing ASV tables from DT and finely
adjusting CPU operating points to optimize power consumption and ensure
proper operation for each SoC revision.

I just recently noticed there are already somewhat similar drivers located
in drivers/power/avs, I'm considering moving exynos-asv driver there in next
iteration of this patch set.

This patch set includes Exynos CHIPID driver posted by Pankaj Dubey and
futher improved by Bartlomiej Zolnierkiewicz [1].

Tested on Odroid XU3, XU3 Lite, XU4 and Exynos5433 TM2 board (with further
patches not included in this series).

The DT binding documented in patch 3/8 doesn't describe any hardware,
it's purely software description. I'd like to get some feedback specially
on that one, I thought it was reasonable to put that data in DT. There
will be many of this tables, per each SoC type and the driver looks much
better with those tables in DT IMHO.

[1] https://lkml.org/lkml/2018/11/15/908

Pankaj Dubey (3):
soc: samsung: Add exynos chipid driver support
ARM: EXYNOS: enable exynos_chipid for ARCH_EXYNOS
ARM64: EXYNOS: enable exynos_chipid for ARCH_EXYNOS

Sylwester Nawrocki (5):
soc: samsung: Exynos chipid driver update
dt-bindings: exynos: Add ASV tables binding documentation
soc: samsung: Add Exynos Adaptive Supply Voltage driver
ARM: EXYNOS: Enable exynos-asv driver for ARCH_EXYNOS
ARM: dts: exynos: Add ASV tables for exynos5422/5800

.../devicetree/bindings/arm/samsung/asv.txt | 76 +++++
arch/arm/boot/dts/exynos5.dtsi | 2 +-
arch/arm/boot/dts/exynos5800.dtsi | 207 +++++++++++++
arch/arm/mach-exynos/Kconfig | 2 +
arch/arm64/Kconfig.platforms | 1 +
drivers/soc/samsung/Kconfig | 16 +
drivers/soc/samsung/Makefile | 5 +
drivers/soc/samsung/exynos-asv.c | 279 ++++++++++++++++++
drivers/soc/samsung/exynos-asv.h | 114 +++++++
drivers/soc/samsung/exynos-chipid.c | 113 +++++++
drivers/soc/samsung/exynos-chipid.h | 48 +++
drivers/soc/samsung/exynos5422-asv.c | 209 +++++++++++++
drivers/soc/samsung/exynos5422-asv.h | 25 ++
13 files changed, 1096 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/arm/samsung/asv.txt
create mode 100644 drivers/soc/samsung/exynos-asv.c
create mode 100644 drivers/soc/samsung/exynos-asv.h
create mode 100644 drivers/soc/samsung/exynos-chipid.c
create mode 100644 drivers/soc/samsung/exynos-chipid.h
create mode 100644 drivers/soc/samsung/exynos5422-asv.c
create mode 100644 drivers/soc/samsung/exynos5422-asv.h

--
2.17.1

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