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powerpc: Enable /dev/port when isa_io_special is set

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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>
This commit is contained in:
Benjamin Herrenschmidt 2013-08-29 16:55:07 +10:00
parent 306474304f
commit ac237b65f5
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/include/asm/io.h
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@ -21,7 +21,7 @@ extern struct pci_dev *isa_bridge_pcidev;
/*
* has legacy ISA devices ?
*/
#define arch_has_dev_port() (isa_bridge_pcidev != NULL)
#define arch_has_dev_port() (isa_bridge_pcidev != NULL || isa_io_special)
#endif
#include <linux/device.h>