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authorGeorgi Djakov <georgi.djakov@linaro.org>2020-09-03 16:31:29 +0300
committerGeorgi Djakov <georgi.djakov@linaro.org>2020-09-08 16:28:58 +0300
commit9a34e7ad2e123b4ed02a1c579939aadf148683c5 (patch)
treef1f88f2c8c63a1239b17ff10d5573f64aaf06887 /Documentation
parent1521e22bfa12db6225002ba3b040572a78dff996 (diff)
downloadlinux-9a34e7ad2e123b4ed02a1c579939aadf148683c5.tar.bz2
dt-bindings: interconnect: Document the support of optional path tag
Let's document that we now support specifying path tag information in the arg cells of the 'interconnects' DT property. This information would be populated when the xlate_extended() callback is used. Specifying the tag in DT will allow the interconnect framework to do the aggregation based on the tag automatically. The users can still use the icc_set_tag() API if/when needed. Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20200903133134.17201-3-georgi.djakov@linaro.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/interconnect/interconnect.txt24
1 files changed, 23 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/interconnect/interconnect.txt b/Documentation/devicetree/bindings/interconnect/interconnect.txt
index 6f5d23a605b7..138c544c8c8c 100644
--- a/Documentation/devicetree/bindings/interconnect/interconnect.txt
+++ b/Documentation/devicetree/bindings/interconnect/interconnect.txt
@@ -19,7 +19,8 @@ directly.
Required properties:
- compatible : contains the interconnect provider compatible string
- #interconnect-cells : number of cells in a interconnect specifier needed to
- encode the interconnect node id
+ encode the interconnect node id and optionally add a
+ path tag
Example:
@@ -44,6 +45,10 @@ components it has to interact with.
Required properties:
interconnects : Pairs of phandles and interconnect provider specifier to denote
the edge source and destination ports of the interconnect path.
+ An optional path tag value could specified as additional argument
+ to both endpoints and in such cases, this information will be passed
+ to the interconnect framework to do aggregation based on the attached
+ tag.
Optional properties:
interconnect-names : List of interconnect path name strings sorted in the same
@@ -62,3 +67,20 @@ Example:
interconnects = <&pnoc MASTER_SDCC_1 &bimc SLAVE_EBI_CH0>;
interconnect-names = "sdhc-mem";
};
+
+Example with path tags:
+
+ gnoc: interconnect@17900000 {
+ ...
+ interconnect-cells = <2>;
+ };
+
+ mnoc: interconnect@1380000 {
+ ...
+ interconnect-cells = <2>;
+ };
+
+ cpu@0 {
+ ...
+ interconnects = <&gnoc MASTER_APPSS_PROC 3 &mnoc SLAVE_EBI1 3>;
+ }