[v2,04/11] dt-bindings: opp: Introduce opp-peak-KBps and opp-avg-KBps bindings
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Message ID 20190614041733.120807-5-saravanak@google.com
State New
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Series
  • Introduce Bandwidth OPPs & interconnect devfreq driver
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Commit Message

Saravana Kannan June 14, 2019, 4:17 a.m. UTC
Interconnects often quantify their performance points in terms of
bandwidth. So, add opp-peak-KBps (required) and opp-avg-KBps (optional) to
allow specifying Bandwidth OPP tables in DT.

opp-peak-KBps is a required property that replace opp-hz for Bandwidth OPP
tables.

opp-avg-KBps is an optional property that can be used in Bandwidth OPP
tables.

Signed-off-by: Saravana Kannan <saravanak@google.com>
---
 Documentation/devicetree/bindings/opp/opp.txt | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

Patch
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diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
index 76b6c79604a5..c869e87caa2a 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -83,9 +83,14 @@  properties.
 
 Required properties:
 - opp-hz: Frequency in Hz, expressed as a 64-bit big-endian integer. This is a
-  required property for all device nodes but devices like power domains. The
-  power domain nodes must have another (implementation dependent) property which
-  uniquely identifies the OPP nodes.
+  required property for all device nodes but for devices like power domains or
+  bandwidth opp tables. The power domain nodes must have another (implementation
+  dependent) property which uniquely identifies the OPP nodes. The interconnect
+  opps are required to have the opp-peak-bw property.
+
+- opp-peak-KBps: Peak bandwidth in kilobytes per second, expressed as a 32-bit
+  big-endian integer. This is a required property for all devices that don't
+  have opp-hz. For example, bandwidth OPP tables for interconnect paths.
 
 Optional properties:
 - opp-microvolt: voltage in micro Volts.
@@ -132,6 +137,10 @@  Optional properties:
 - opp-level: A value representing the performance level of the device,
   expressed as a 32-bit integer.
 
+- opp-avg-KBps: Average bandwidth in kilobytes per second, expressed as a
+  32-bit big-endian integer. This property is only meaningful in OPP tables
+  where opp-peak-KBps is present.
+
 - clock-latency-ns: Specifies the maximum possible transition latency (in
   nanoseconds) for switching to this OPP from any other OPP.