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PCI: brcmstb: Add control of subdevice voltage regulators
This Broadcom STB PCIe RC driver has one port and connects directly to one device, be it a switch or an endpoint. We want to be able to leverage the recently added mechanism that allocates and turns on/off subdevice regulators. All that needs to be done is to put the regulator DT nodes in the bridge below host and to set the pci_ops methods add_bus and remove_bus. Note that the pci_subdev_regulators_add_bus() method is wrapped for two reasons: 1. To achieve link up after the voltage regulators are turned on. 2. If, in the case of an unsuccessful link up, to redirect any PCIe accesses to subdevices, e.g. the scan for DEV/ID. This redirection is needed because the Broadcom PCIe HW will issue a CPU abort if such an access is made when the link is down. The pci_subdev_regulators_remove_bus() is wrapped as well as we must avoid invoking it if we see that there is a collision in the use of dev->driver_data. [bhelgaas: fold in https://lore.kernel.org/r/20220112013100.48029-1-jim2101024@gmail.com] Link: https://lore.kernel.org/r/20220106160332.2143-7-jim2101024@gmail.com Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
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