[PATCH v3 0/7] interconnect: Introduce xlate_extended()

[Georgi Djakov]

Currently the interconnect framework provides the xlate() callback for
mapping the endpoints from phandle arguments in DT. This is implemented
by the provider drivers. But the endpoints (or the path between the
endpoints) might have an additional attributes, which should be parsed
and populated. During previous discussions [1], it was suggested that
adding more and more DT properties will not scale very well. So instead
of adding DT properties, such data should be put into the 'interconnects'
arguments.

This patchset is introducing a new xlate_extended() callback, which
would allow the interconnect provider drivers to parse additional data
(such as path tags) and allow the framework to make use of them.

Thanks to Sibi for the preliminary feedback and testing this patchset
on the sc7180 platform.

The patchset is based on linux-next (next-20200903).

Changelog:
v3:
* Rebase and update both dts patches as Doug reported that i missed to
  update the cells for the GPU and also other stuff changed in DT recently.
* Pick Rob's Reviewed-by

v2: http://lore.kernel.org/r/20200806163126.22667-1-georgi.djakov@xxxxxxxxxx
* Add a patch to update the DT documentation, which i missed initially.
* Minor changes in commit text of patch 1/7. (Sibi)
* Remove a useless null check in patch 4/7. (Sibi)
* Print a warning if the number of DT args is higher than what we expect
  in patch 3/7. (Matthias)
* Pick Reviewed-by/Tested-by tags.
* TODO: Replace tag IDs with macros in patches 5/7 and 7/7 when [2] lands.

v1: http://lore.kernel.org/r/20200723130942.28491-1-georgi.djakov@xxxxxxxxxx

[1] https://lore.kernel.org/linux-devicetree/20200519185836.GA469006@bogus/
[2] https://lore.kernel.org/r/20200801033215.1440-2-mdtipton@xxxxxxxxxxxxxx

Georgi Djakov (5):
  interconnect: Introduce xlate_extended() callback
  dt-bindings: interconnect: Document the support of optional path tag
  interconnect: qcom: Implement xlate_extended() to parse tags
  interconnect: qcom: sdm845: Replace xlate with xlate_extended
  arm64: dts: qcom: sdm845: Increase the number of interconnect cells

Sibi Sankar (2):
  interconnect: qcom: sc7180: Replace xlate with xlate_extended
  arm64: dts: qcom: sc7180: Increase the number of interconnect cells

 .../bindings/interconnect/interconnect.txt    |  24 +-
 arch/arm64/boot/dts/qcom/sc7180.dtsi          | 218 +++++++++---------
 arch/arm64/boot/dts/qcom/sdm845.dtsi          |  48 ++--
 drivers/interconnect/core.c                   |  73 ++++--
 drivers/interconnect/qcom/icc-rpmh.c          |  27 +++
 drivers/interconnect/qcom/icc-rpmh.h          |   1 +
 drivers/interconnect/qcom/sc7180.c            |   2 +-
 drivers/interconnect/qcom/sdm845.c            |   2 +-
 include/linux/interconnect-provider.h         |  17 +-
 9 files changed, 251 insertions(+), 161 deletions(-)