The current DT bindings assume that the DMA will be performed by the
devices through their parent DT node, and rely on that assumption for the
address translation using dma-ranges.
However, some SoCs have devices that will perform DMA through another bus,
with separate address translation rules. We therefore need to express that
relationship, through the special interconnect name "dma".
Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
---
Documentation/devicetree/bindings/interconnect/interconnect.txt | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/devicetree/bindings/interconnect/interconnect.txt b/Documentation/devicetree/bindings/interconnect/interconnect.txt
index 5a3c575b387a..6f5d23a605b7 100644
--- a/Documentation/devicetree/bindings/interconnect/interconnect.txt
+++ b/Documentation/devicetree/bindings/interconnect/interconnect.txt
@@ -51,6 +51,10 @@ interconnect-names : List of interconnect path name strings sorted in the same
interconnect-names to match interconnect paths with interconnect
specifier pairs.
+ Reserved interconnect names:
+ * dma-mem: Path from the device to the main memory of
+ the system
+
Example:
sdhci@7864000 {
--
git-series 0.9.1
