On some platforms the exact frequency or voltage may be hidden from the
OS by the firmware. Allow such configurations to pass magic values in
the "opp-hz" or the "opp-microvolt" properties, which should be
interpreted in a platform dependent way.
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
Documentation/devicetree/bindings/opp/opp.txt | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
index 4e4f30288c8b..00a3bdbd0f1f 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -167,6 +167,12 @@ properties.
functioning of the current device at the current OPP (where this property is
present).
+
+On some platforms the exact frequency or voltage may be hidden from the OS by
+the firmware and the "opp-hz" or the "opp-microvolt" properties may contain
+magic values that represent the frequency or voltage in a firmware dependent
+way, for example an index of an array in the firmware.
+
Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together.
/ {
--
2.15.0.194.g9af6a3dea062
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