PCI: designware-ep: Add multiple PFs support for DWC
Add multiple PFs support for DWC, due to different PF have different config space, we use func_conf_select callback function to access the different PF's config space, the different chip company need to implement this callback function when use the DWC IP core and intend to support multiple PFs feature. Link: https://lore.kernel.org/r/20200918080024.13639-2-Zhiqiang.Hou@nxp.comSigned-off-by: NXiaowei Bao <xiaowei.bao@nxp.com> Signed-off-by: NHou Zhiqiang <Zhiqiang.Hou@nxp.com> Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: NRob Herring <robh@kernel.org> Acked-by: NGustavo Pimentel <gustavo.pimentel@synopsys.com>
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