Let's introduce the Interconnect subsystem based on the Linux framework which is used to vote for bandwidth across multiple SoC busses.
Each bus endpoints are materialized as "nodes" wich are linked together, and the DT will specify a pair of nodes to enable and set a bandwidth on the route betweeen those endpoints. The hardware resources that provide those nodes and provides the way to vote for the bandwidth are called "providers". The Interconnect uclass code is heavily based on the Linux one, with some small differences: - nodes are allocated as udevices instead of Linux idr_alloc() - tag management is minimal, only normal xlate is supported - dynamic IDs is not implemented - getting nodes states at probe is not implemented - providers are probed on demand while the nodes links are traversed DM Testsuite is missing, will be added soon. This is an RFC to make sure I'm correctly using the DM infrastructure, since it's my first uclass implementation I would like some feedbacks. Qcom implementation depends on: - https://lore.kernel.org/all/[email protected]/ Signed-off-by: Neil Armstrong <[email protected]> --- Neil Armstrong (6): Introduce Interconnect Subsystem MAINTAINERS: add myself as Maintainer of Interconnect interconnect: add support for the Qualcomm RPMh helpers interconnect: add support for the SM8650 SoC ufs: qcom: vote for interconnect bandwidth on probe qcom_defconfig: enable interconnect for SM8650 MAINTAINERS | 8 + configs/qcom_defconfig | 3 + drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/interconnect/Kconfig | 16 + drivers/interconnect/Makefile | 7 + drivers/interconnect/interconnect-uclass.c | 560 ++++++++++ drivers/interconnect/qcom/Kconfig | 12 + drivers/interconnect/qcom/Makefile | 7 + drivers/interconnect/qcom/bcm-voter.c | 340 ++++++ drivers/interconnect/qcom/bcm-voter.h | 19 + drivers/interconnect/qcom/icc-rpmh.c | 226 ++++ drivers/interconnect/qcom/icc-rpmh.h | 128 +++ drivers/interconnect/qcom/sm8650.c | 1662 ++++++++++++++++++++++++++++ drivers/interconnect/qcom/sm8650.h | 144 +++ drivers/ufs/ufs-qcom.c | 13 + include/dm/uclass-id.h | 2 + include/interconnect-uclass.h | 77 ++ include/interconnect.h | 80 ++ 19 files changed, 3307 insertions(+) --- base-commit: 5f04cd73e8051849fb495c001bfb4adc2fc544e6 change-id: 20251003-topic-interconnect-next-4ed75aecc01c Best regards, -- Neil Armstrong <[email protected]>
