PCI: dwc: Add dw_pcie_ep_{read,write}_dbi[2] helpers
The current code calculated some dbi[2] registers' offset by calling dw_pcie_ep_get_dbi[2]_offset() in each function. To improve the code readability, add dw_pcie_ep_{read,write}_dbi[2} and some data-width related helpers. Link: https://lore.kernel.org/linux-pci/20231220053829.1921187-5-yoshihiro.shimoda.uh@renesas.comSigned-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Reviewed-by: Serge Semin <fancer.lancer@gmail.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
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