[PATCH V8 3/3] OPP: Allow "opp-hz" and "opp-microvolt" to contain magic values
From: Viresh Kumar <viresh.kumar@linaro.org>
Date: 2017-12-18 10:21:51
Also in:
linux-pm, lkml
Subsystem:
open firmware and flattened device tree bindings, operating performance points (opp), the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Viresh Kumar, Nishanth Menon, Stephen Boyd, Linus Torvalds
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 <redacted> 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 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. / {
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2.15.0.194.g9af6a3dea062