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Subject[RFC V7 2/2] OPP: Allow "opp-hz" and "opp-microvolt" to contain magic values
Date
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.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
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 203e09fe7698..9c5056fb120f 100644
--- a/Documentation/devicetree/bindings/opp/opp.txt
+++ b/Documentation/devicetree/bindings/opp/opp.txt
@@ -166,6 +166,12 @@ properties.
"power-domains" property. Also, either all or none of the OPP nodes in an OPP
table should have it set.

+
+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.

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