| Message ID | 2b244ea0a09deaf50237fb8b7578273a8284499e.1509453284.git.viresh.kumar@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [RFC,V7,1/2] OPP: Allow OPP table to be used for power-domains | expand |
On 31 October 2017 at 13:47, Viresh Kumar <viresh.kumar@linaro.org> wrote: > Power-domains can also have their active states and this patch enhances > the OPP binding to define those. > > The power domains can use the OPP bindings mostly as is. Though there > are some changes required to support special cases: > > - Allow "operating-points-v2" to contain multiple phandles for power > domain providers providing multiple domains. > > - A new property "power-domain-opp" is added for devices to specify the > minimum required OPP of the master domain for the functioning of the > device. We can add this property directly to device's node if the > device has a fixed minimum OPP requirement from the master power Please avoid the terminology "master power domain", it's confusing. Instead use only "power domain". This applies to a couple of more places of $subject patch, please fix those as well. > domain. Or we can add this property to each OPP node of the device, if > different OPP nodes have different minimum OPP requirement from the > master power domain. > > Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> > --- > Documentation/devicetree/bindings/opp/opp.txt | 12 +++++ > .../devicetree/bindings/power/power_domain.txt | 62 ++++++++++++++++++++++ > 2 files changed, 74 insertions(+) > > diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt > index 9d733af26be7..203e09fe7698 100644 > --- a/Documentation/devicetree/bindings/opp/opp.txt > +++ b/Documentation/devicetree/bindings/opp/opp.txt > @@ -45,6 +45,11 @@ Devices supporting OPPs must set their "operating-points-v2" property with > phandle to a OPP table in their DT node. The OPP core will use this phandle to > find the operating points for the device. > > +This can contain more than one phandle for power domain providers that provide > +multiple power domains. That is, one phandle for each power domain. If only one > +phandle is available, then the same OPP table will be used for all power domains > +provided by the power domain provider. > + > If required, this can be extended for SoC vendor specific bindings. Such bindings > should be documented as Documentation/devicetree/bindings/power/<vendor>-opp.txt > and should have a compatible description like: "operating-points-v2-<vendor>". > @@ -154,6 +159,13 @@ properties. > > - status: Marks the node enabled/disabled. > > +- power-domain-opp: This contains phandle to one of the OPP nodes of the master > + power domain. This specifies the minimum required OPP of the master domain for > + the functioning of the device in this OPP (where this property is present). > + This property can only be set for a device if the device node contains the > + "power-domains" property. Also, either all or none of the OPP nodes in an OPP > + table should have it set. > + > Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together. > > / { > diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt > index 14bd9e945ff6..0d8608f2d133 100644 > --- a/Documentation/devicetree/bindings/power/power_domain.txt > +++ b/Documentation/devicetree/bindings/power/power_domain.txt > @@ -40,6 +40,12 @@ phandle arguments (so called PM domain specifiers) of length specified by the > domain's idle states. In the absence of this property, the domain would be > considered as capable of being powered-on or powered-off. > > +- operating-points-v2 : Phandles to the OPP tables of power domains provided by > + a power domain provider. If the provider provides a single power domain only > + or all the power domains provided by the provider have identical OPP tables, > + then this shall contain a single phandle. Refer to ../opp/opp.txt for more > + information. > + > Example: > > power: power-controller@12340000 { > @@ -120,4 +126,60 @@ The node above defines a typical PM domain consumer device, which is located > inside a PM domain with index 0 of a power controller represented by a node > with the label "power". > > +Optional properties: > +- power-domain-opp: This contains phandle to one of the OPP nodes of the master > + power domain. This specifies the minimum required OPP of the master domain for > + the functioning of the device. This property can only be set for a device, if > + the device node contains the "power-domains" property. > + > +Example: > +- OPP table for domain provider that provides two domains. > + > + domain0_opp_table: opp_table0 { > + compatible = "operating-points-v2"; > + > + domain0_opp_0: opp-1000000000 { > + opp-hz = /bits/ 64 <1000000000>; > + opp-microvolt = <975000 970000 985000>; > + }; > + domain0_opp_1: opp-1100000000 { > + opp-hz = /bits/ 64 <1100000000>; > + opp-microvolt = <1000000 980000 1010000>; > + }; > + }; > + > + domain1_opp_table: opp_table1 { > + compatible = "operating-points-v2"; > + > + domain1_opp_0: opp-1200000000 { > + opp-hz = /bits/ 64 <1200000000>; > + opp-microvolt = <975000 970000 985000>; > + }; > + domain1_opp_1: opp-1300000000 { > + opp-hz = /bits/ 64 <1300000000>; > + opp-microvolt = <1000000 980000 1010000>; > + }; > + }; > + > + parent: power-controller@12340000 { > + compatible = "foo,power-controller"; > + reg = <0x12340000 0x1000>; > + #power-domain-cells = <1>; > + operating-points-v2 = <&domain0_opp_table>, <&domain1_opp_table>; > + }; > + > + leaky-device0@12350000 { > + compatible = "foo,i-leak-current"; > + reg = <0x12350000 0x1000>; > + power-domains = <&parent 0>; > + power-domain-opp = <&domain0_opp_0>; > + }; > + > + leaky-device1@12350000 { > + compatible = "foo,i-leak-current"; > + reg = <0x12350000 0x1000>; > + power-domains = <&parent 1>; > + power-domain-opp = <&domain1_opp_1>; > + }; > + > [1]. Documentation/devicetree/bindings/power/domain-idle-state.txt > -- Besides the minor nitpick(s), this looks good to me. Feel free to add: Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Kind regards Uffe
diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt index 9d733af26be7..203e09fe7698 100644 --- a/Documentation/devicetree/bindings/opp/opp.txt +++ b/Documentation/devicetree/bindings/opp/opp.txt @@ -45,6 +45,11 @@ Devices supporting OPPs must set their "operating-points-v2" property with phandle to a OPP table in their DT node. The OPP core will use this phandle to find the operating points for the device. +This can contain more than one phandle for power domain providers that provide +multiple power domains. That is, one phandle for each power domain. If only one +phandle is available, then the same OPP table will be used for all power domains +provided by the power domain provider. + If required, this can be extended for SoC vendor specific bindings. Such bindings should be documented as Documentation/devicetree/bindings/power/<vendor>-opp.txt and should have a compatible description like: "operating-points-v2-<vendor>". @@ -154,6 +159,13 @@ properties. - status: Marks the node enabled/disabled. +- power-domain-opp: This contains phandle to one of the OPP nodes of the master + power domain. This specifies the minimum required OPP of the master domain for + the functioning of the device in this OPP (where this property is present). + This property can only be set for a device if the device node contains the + "power-domains" property. Also, either all or none of the OPP nodes in an OPP + table should have it set. + Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together. / { diff --git a/Documentation/devicetree/bindings/power/power_domain.txt b/Documentation/devicetree/bindings/power/power_domain.txt index 14bd9e945ff6..0d8608f2d133 100644 --- a/Documentation/devicetree/bindings/power/power_domain.txt +++ b/Documentation/devicetree/bindings/power/power_domain.txt @@ -40,6 +40,12 @@ phandle arguments (so called PM domain specifiers) of length specified by the domain's idle states. In the absence of this property, the domain would be considered as capable of being powered-on or powered-off. +- operating-points-v2 : Phandles to the OPP tables of power domains provided by + a power domain provider. If the provider provides a single power domain only + or all the power domains provided by the provider have identical OPP tables, + then this shall contain a single phandle. Refer to ../opp/opp.txt for more + information. + Example: power: power-controller@12340000 { @@ -120,4 +126,60 @@ The node above defines a typical PM domain consumer device, which is located inside a PM domain with index 0 of a power controller represented by a node with the label "power". +Optional properties: +- power-domain-opp: This contains phandle to one of the OPP nodes of the master + power domain. This specifies the minimum required OPP of the master domain for + the functioning of the device. This property can only be set for a device, if + the device node contains the "power-domains" property. + +Example: +- OPP table for domain provider that provides two domains. + + domain0_opp_table: opp_table0 { + compatible = "operating-points-v2"; + + domain0_opp_0: opp-1000000000 { + opp-hz = /bits/ 64 <1000000000>; + opp-microvolt = <975000 970000 985000>; + }; + domain0_opp_1: opp-1100000000 { + opp-hz = /bits/ 64 <1100000000>; + opp-microvolt = <1000000 980000 1010000>; + }; + }; + + domain1_opp_table: opp_table1 { + compatible = "operating-points-v2"; + + domain1_opp_0: opp-1200000000 { + opp-hz = /bits/ 64 <1200000000>; + opp-microvolt = <975000 970000 985000>; + }; + domain1_opp_1: opp-1300000000 { + opp-hz = /bits/ 64 <1300000000>; + opp-microvolt = <1000000 980000 1010000>; + }; + }; + + parent: power-controller@12340000 { + compatible = "foo,power-controller"; + reg = <0x12340000 0x1000>; + #power-domain-cells = <1>; + operating-points-v2 = <&domain0_opp_table>, <&domain1_opp_table>; + }; + + leaky-device0@12350000 { + compatible = "foo,i-leak-current"; + reg = <0x12350000 0x1000>; + power-domains = <&parent 0>; + power-domain-opp = <&domain0_opp_0>; + }; + + leaky-device1@12350000 { + compatible = "foo,i-leak-current"; + reg = <0x12350000 0x1000>; + power-domains = <&parent 1>; + power-domain-opp = <&domain1_opp_1>; + }; + [1]. Documentation/devicetree/bindings/power/domain-idle-state.txt
Power-domains can also have their active states and this patch enhances the OPP binding to define those. The power domains can use the OPP bindings mostly as is. Though there are some changes required to support special cases: - Allow "operating-points-v2" to contain multiple phandles for power domain providers providing multiple domains. - A new property "power-domain-opp" is added for devices to specify the minimum required OPP of the master domain for the functioning of the device. We can add this property directly to device's node if the device has a fixed minimum OPP requirement from the master power domain. Or we can add this property to each OPP node of the device, if different OPP nodes have different minimum OPP requirement from the master power domain. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> --- Documentation/devicetree/bindings/opp/opp.txt | 12 +++++ .../devicetree/bindings/power/power_domain.txt | 62 ++++++++++++++++++++++ 2 files changed, 74 insertions(+) -- 2.15.0.rc1.236.g92ea95045093