Commit ac237b65 authored Aug 29, 2013 by Benjamin Herrenschmidt

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>

parent 30647430

arch/powerpc/include/asm/io.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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>