Subject should rather be: dt-bindings: opp: Allow empty OPP tables On 02-12-20, 17:23, Nicola Mazzucato wrote: > Currently the optional property opp-shared is used within an opp table > to tell that a set of devices share their clock/voltage lines (and the > opp points). > It is therefore possible to use an empty opp table to convey only that > information, useful in situations where the opp points are provided via > other means (hardware. firmware, etc). > > Update the documentation to remark this additional case and provide an > example. > > Signed-off-by: Nicola Mazzucato <nicola.mazzucato@xxxxxxx> > --- > Documentation/devicetree/bindings/opp/opp.txt | 53 +++++++++++++++++++ > 1 file changed, 53 insertions(+) > > diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt > index 9847dfeeffcb..a5f1f993eab9 100644 > --- a/Documentation/devicetree/bindings/opp/opp.txt > +++ b/Documentation/devicetree/bindings/opp/opp.txt > @@ -72,6 +72,9 @@ Optional properties: > switch their DVFS state together, i.e. they share clock/voltage/current lines. > Missing property means devices have independent clock/voltage/current lines, > but they share OPP tables. > + This optional property can be used without any OPP nodes when its only purpose > + is to describe a dependency of clock/voltage/current lines among a set of > + devices. And instead of this, we should rather update "OPP nodes:" section like this: diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt index 9847dfeeffcb..28077ce3a845 100644 --- a/Documentation/devicetree/bindings/opp/opp.txt +++ b/Documentation/devicetree/bindings/opp/opp.txt @@ -63,11 +63,13 @@ This describes the OPPs belonging to a device. This node can have following - compatible: Allow OPPs to express their compatibility. It should be: "operating-points-v2". +Optional properties: - OPP nodes: One or more OPP nodes describing voltage-current-frequency combinations. Their name isn't significant but their phandle can be used to - reference an OPP. + reference an OPP. These are mandatory except for the case where the OPP table + is present only to indicate dependency between devices using the opp-shared + property. -Optional properties: - opp-shared: Indicates that device nodes using this OPP Table Node's phandle switch their DVFS state together, i.e. they share clock/voltage/current lines. Missing property means devices have independent clock/voltage/current lines, -- viresh
