Patchwork [v4,1/7] dt-bindings: interconnect: Add a dma interconnect name

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Submitter Maxime Ripard
Date March 14, 2019, 8:26 p.m.
Message ID <9512c3223c26c12b02376cf4ba4a74ca29de1132.1552595146.git-series.maxime.ripard@bootlin.com>
Download mbox | patch
Permalink /patch/749049/
State New
Headers show

Comments

Maxime Ripard - March 14, 2019, 8:26 p.m.
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@bootlin.com>
---
 Documentation/devicetree/bindings/interconnect/interconnect.txt | 4 ++++
 1 file changed, 4 insertions(+)

Patch

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 {