powerpc: Enable /dev/port when isa_io_special is set
isa_io_special is set when the platform provides a "special" implementation of inX/outX via some FW interface for example. Such a platform doesn't need an ISA bridge on PCI, and so /dev/port should be made available even if one isn't present. This makes the LPC bus IOs accessible via /dev/port on PowerNV Power8 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -21,7 +21,7 @@ extern struct pci_dev *isa_bridge_pcidev;
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/*
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* has legacy ISA devices ?
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*/
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#define arch_has_dev_port() (isa_bridge_pcidev != NULL)
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#define arch_has_dev_port() (isa_bridge_pcidev != NULL || isa_io_special)
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#endif
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#include <linux/device.h>
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