From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: [PATCH V8 3/3] OPP: Allow "opp-hz" and "opp-microvolt" to contain magic values Date: Mon, 18 Dec 2017 15:51:30 +0530 Message-ID: <476d7ae69184d787ccc6d99f8df6069007fd0a91.1513591822.git.viresh.kumar@linaro.org> References: Return-path: In-Reply-To: In-Reply-To: References: Sender: linux-pm-owner@vger.kernel.org To: ulf.hansson@linaro.org, Kevin Hilman , robh+dt@kernel.org, Viresh Kumar , Nishanth Menon , Stephen Boyd Cc: Viresh Kumar , Rafael Wysocki , linux-pm@vger.kernel.org, Vincent Guittot , rnayak@codeaurora.org, sudeep.holla@arm.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org 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 Signed-off-by: Viresh Kumar --- 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