backports: add linux/irqdomain.h

ssb uses this header file, but does not use any of the functions in
there in the default config, because that is only used when
SSB_DRIVER_GPIO and SSB_EMBEDDED are activated.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/backport/backport-include/linux/irqdomain.h b/backport/backport-include/linux/irqdomain.h
new file mode 100644 (file)
index 0000000..a889a29
--- /dev/null
+++ b/backport/backport-include/linux/irqdomain.h
@@ -0,0 +1,9 @@
+#ifndef __BACKPORT_LINUX_IRQDOMAIN_H
+#define __BACKPORT_LINUX_IRQDOMAIN_H
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
+#include_next <linux/irqdomain.h>
+#endif
+
+#endif /* __BACKPORT_LINUX_IRQDOMAIN_H */