This patch introduce a new API to get the requirement and configure the
interconnect buses across the entire chipset to fit with the current demand.

The API is using a consumer/provider-based model, where the providers are
the interconnect controllers and the consumers could be various drivers.
The consumers request interconnect resources (path) to an endpoint and set
the desired constraints on this data flow path. The provider(s) receive
requests from consumers and aggregate these requests for all master-slave
pairs on that path. Then the providers configure each participating in the
topology node according to the requested data flow path, physical links and
constraints. The topology could be complicated and multi-tiered and is SoC
specific.

Signed-off-by: Georgi Djakov <redacted>
---
 Documentation/interconnect/interconnect.txt |  65 +++++
 drivers/Kconfig                             |   2 +
 drivers/Makefile                            |   1 +
 drivers/interconnect/Kconfig                |  10 +
 drivers/interconnect/Makefile               |   1 +
 drivers/interconnect/interconnect.c         | 376 ++++++++++++++++++++++++++++
 include/linux/interconnect-consumer.h       |  72 ++++++
 include/linux/interconnect-provider.h       | 120 +++++++++
 8 files changed, 647 insertions(+)
 create mode 100644 Documentation/interconnect/interconnect.txt
 create mode 100644 drivers/interconnect/Kconfig
 create mode 100644 drivers/interconnect/Makefile
 create mode 100644 drivers/interconnect/interconnect.c
 create mode 100644 include/linux/interconnect-consumer.h
 create mode 100644 include/linux/interconnect-provider.h

diff --git a/Documentation/interconnect/interconnect.txt b/Documentation/interconnect/interconnect.txt
new file mode 100644
index 000000000000..f761a2fb553c
--- /dev/null
+++ b/Documentation/interconnect/interconnect.txt