[RFC PATCH v2 3/7] iommu: add new iommu_ops callback for adding an OF device

[Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>]

This patch adds a new function to the iommu_ops structure to allow an
OF device to be added to a specific IOMMU instance using the recently
merged generic devicetree binding for IOMMUs. The callback (of_xlate)
takes a struct device representing the master and an of_phandle_args
representing the IOMMU and the correspondong IDs for the new master.

Signed-off-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
---
 include/linux/iommu.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index fdddb14cd8f5..3e766b85daa3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -21,6 +21,7 @@
 
 #include <linux/errno.h>
 #include <linux/err.h>
+#include <linux/of.h>
 #include <linux/types.h>
 #include <trace/events/iommu.h>
 
@@ -136,6 +137,10 @@ struct iommu_ops {
 	/* Get the numer of window per domain */
 	u32 (*domain_get_windows)(struct iommu_domain *domain);
 
+#ifdef CONFIG_OF_IOMMU
+	int (*of_xlate)(struct device *dev, struct of_phandle_args *args);
+#endif
+
 	unsigned long pgsize_bitmap;
 };
 
-- 
2.1.0