linux-phytec-ti

PCI: endpoint: Add API to get reference to EPC from device-tree

Add of_pci_epc_get() and of_pci_epc_get_by_name() to get reference
to EPC from device-tree. This is added in preparation to define
an endpoint function from device tree.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>