PCI: host-generic: Allow {en,dis}able_device() to be provided via pci_ecam_ops

In order to let host controller drivers using the host-generic
infrastructure use the {en,dis}able_device() callbacks that can be used to
configure sideband RID mapping hardware, provide these two callbacks as
part of the pci_ecam_ops structure.

Link: https://lore.kernel.org/r/20241204150145.800408-2-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Author: Marc Zyngier

drivers/pci/controller/pci-host-common.c

@@ -75,6 +75,8 @@ int pci_host_common_probe(struct platform_device *pdev)
 
 	bridge->sysdata = cfg;
 	bridge->ops = (struct pci_ops *)&ops->pci_ops;
+	bridge->enable_device = ops->enable_device;
+	bridge->disable_device = ops->disable_device;
 	bridge->msi_domain = true;
 
 	return pci_host_probe(bridge);

include/linux/pci-ecam.h

@@ -45,6 +45,10 @@ struct pci_ecam_ops {
 	unsigned int			bus_shift;
 	struct pci_ops			pci_ops;
 	int				(*init)(struct pci_config_window *);
+	int				(*enable_device)(struct pci_host_bridge *,
+							 struct pci_dev *);
+	void				(*disable_device)(struct pci_host_bridge *,
+							  struct pci_dev *);
 };
 
 /*