Hello,
On 2014-09-12 18:34, Will Deacon wrote:
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 <[email protected]>
---
include/linux/iommu.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 4256f3ce1673..821eb0bd9f6c 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>
@@ -140,6 +141,10 @@ 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
If I understand correctly, this callback is intended to do per-master
initialization
of the iommu structures required by the given iommu driver (I stored them in
dev->archdata.iommu). However I really don't get what is the meaning of
the return
value. Is it a boolean value? It is used only by of_iommu_configure to
check if
the parse loop should be terminated...
+
unsigned long pgsize_bitmap;
};
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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