The Master AXI clock can be disabled when it is not used i.e., when there
is no traffic on the PCIe bus. This helps to save power during idle state.

[bhelgaas: tidy and wrap comment]
Link: https://lore.kernel.org/r/20220914075350.7992-8-manivannan.sadhasivam@linaro.orgSigned-off-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: NLorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>