On Thu, Apr 04, 2019 at 07:17:30PM +0200, Sylwester Nawrocki wrote: > This patch adds documentation of the Exynos ASV (Adaptive Voltage Supply) > tables DT binding. > > Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx> > --- > .../devicetree/bindings/arm/samsung/asv.txt | 76 +++++++++++++++++++ > 1 file changed, 76 insertions(+) > create mode 100644 Documentation/devicetree/bindings/arm/samsung/asv.txt > > diff --git a/Documentation/devicetree/bindings/arm/samsung/asv.txt b/Documentation/devicetree/bindings/arm/samsung/asv.txt > new file mode 100644 > index 000000000000..0db907263a91 > --- /dev/null > +++ b/Documentation/devicetree/bindings/arm/samsung/asv.txt > @@ -0,0 +1,76 @@ > +Exynos Adaptive Supply Voltage (ASV) tables > +------------------------------------------- > + > +The Adaptive Supply Voltage (ASV) on Exynos SoCs is a technique of adjusting > +operating points, i.e. the power supply voltage for given clock frequency, > +in order to better match actual capabilities of the hardware and optimize power > +consumption. This applies to subsystem 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 by the OS to select more finely matching operating points for > +devices. We already have OPP tables defined for QCom CPUs to do speed bining, and I just reviewed something from Allwinner for similar purposes. We can't have each vendor doing their own thing here. Rob
