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The DBB clock is needed by many IP blocks in order to access system memory via the data backbone. The memory controller and external memory controllers are the central place where these accesses are managed, so make sure that the clock can be controlled from the corresponding driver. Note that not all drivers fully register bandwidth requests, and hence the EMC driver doesn't have enough information to know when it's safe to switch the clock off, so for now it will be kept on permanently. Signed-off-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Jon Hunter <jonathanh@nvidia.com> Link: https://patch.msgid.link/20260116123732.140813-1-thierry.reding@gmail.com Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>