> > This patch adds the documentation for generic exynos bus frequency > driver. > > Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx> > Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> A little changes following: > --- > .../devicetree/bindings/devfreq/exynos-bus.txt | 93 ++++++++++++++++++++++ > 1 file changed, 93 insertions(+) > create mode 100644 Documentation/devicetree/bindings/devfreq/exynos-bus.txt > > diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt > new file mode 100644 > index 000000000000..e32daef328da > --- /dev/null > +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt > @@ -0,0 +1,93 @@ > +* Generic Exynos Bus frequency device > + > +The Samsung Exynos SoC have many buses for data transfer between DRAM +The Samsung Exynos SoC has many buses for data transfer between DRAM or +The Samsung Exynos SoCs have many buses for data transfer between DRAM (because you intend to support mulitple Exynos SoCs) > +and sub-blocks in SoC. Almost Exynos SoC have the common architecture +and sub-blocks in SoC. Most Exynos SoCs share the common architecture > +for buses. Generally, the each bus of Exynos SoC includes the source clock +for buses. Generally, each bus of Exynos SoC includes a source clock > +and power line and then is able to change the clock according to the usage +and a power line, which are able to change the clock frequency > +of each buses on runtime. When gathering the usage of each buses on runtime, +of the bus in runtime. To monitor the usage of each bus in runtime, > +the driver uses the PPMU (Platform Performance Monitoring Unit) which +the driver uses the PPMU (Platform Performance Monitoring Unit), which > +is able to measure the current load of sub-blocks. > + > +There are a little different composition among Exynos SoC because each Exynos > +SoC has the different sub-blocks. So, this difference should be specified +SoC has different sub-blocks. Therefore, such difference should be specified > +in devicetree file instead of each device driver. In result, this driver > +is able to support the bus frequency for all Exynos SoCs. > + [] ��.n��������+%������w��{.n����z�{��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f