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Factor out this pattern:
if (!pci->ops || !pci->ops->start_link)
return -EINVAL;
return pci->ops->start_link(pci);
into a new dw_pcie_start_link() wrapper and do the same for the stop_link()
method.
Note that dw_pcie_ep_start() previously returned -EINVAL if there was no
platform start_link() method, which didn't make much sense since that is
not an error. It will now return 0 in that case.
As a side-effect, drop the empty start_link() and dummy dw_pcie_ops
instances from the generic DW PCIe and Layerscape EP platform drivers.
[bhelgaas: commit log]
Link: https://lore.kernel.org/r/20220624143428.8334-14-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
a37beefbde