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forked fromtorvalds/linux

Commite856f07

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OPP: Introduce "required-opp" property
Devices have inter-dependencies some times. For example a device thatneeds to run at 800 MHz, needs another device (e.g. Its power domain) tobe configured at a particular operating performance point.This patch introduces a new property "required-opp" which can be presentdirectly in a device's node (if it doesn't need to change its OPPs), orin device's OPP nodes. More details on the property can be seen in thebinding itself.Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>Reviewed-by: Rob Herring <robh@kernel.org>Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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‎Documentation/devicetree/bindings/opp/opp.txt‎

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@@ -159,6 +159,14 @@ Optional properties:
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- status: Marks the node enabled/disabled.
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- required-opp: This contains phandle to an OPP node in another device's OPP
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table. It may contain an array of phandles, where each phandle points to an
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OPP of a different device. It should not contain multiple phandles to the OPP
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nodes in the same OPP table. This specifies the minimum required OPP of the
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device(s), whose OPP's phandle is present in this property, for the
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functioning of the current device at the current OPP (where this property is
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present).
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Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together.
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/ {

‎Documentation/devicetree/bindings/power/power_domain.txt‎

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@@ -126,4 +126,63 @@ The node above defines a typical PM domain consumer device, which is located
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inside a PM domain with index 0 of a power controller represented by a node
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with the label "power".
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Optional properties:
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- required-opp: This contains phandle to an OPP node in another device's OPP
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table. It may contain an array of phandles, where each phandle points to an
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OPP of a different device. It should not contain multiple phandles to the OPP
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nodes in the same OPP table. This specifies the minimum required OPP of the
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device(s), whose OPP's phandle is present in this property, for the
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functioning of the current device at the current OPP (where this property is
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present).
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Example:
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- OPP table for domain provider that provides two domains.
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domain0_opp_table: opp-table0 {
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compatible = "operating-points-v2";
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domain0_opp_0: opp-1000000000 {
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opp-hz = /bits/ 64 <1000000000>;
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opp-microvolt = <975000 970000 985000>;
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};
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domain0_opp_1: opp-1100000000 {
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opp-hz = /bits/ 64 <1100000000>;
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opp-microvolt = <1000000 980000 1010000>;
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};
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};
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domain1_opp_table: opp-table1 {
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compatible = "operating-points-v2";
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domain1_opp_0: opp-1200000000 {
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opp-hz = /bits/ 64 <1200000000>;
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opp-microvolt = <975000 970000 985000>;
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};
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domain1_opp_1: opp-1300000000 {
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opp-hz = /bits/ 64 <1300000000>;
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opp-microvolt = <1000000 980000 1010000>;
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};
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};
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power: power-controller@12340000 {
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compatible = "foo,power-controller";
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reg = <0x12340000 0x1000>;
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#power-domain-cells = <1>;
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operating-points-v2 = <&domain0_opp_table>, <&domain1_opp_table>;
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};
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leaky-device0@12350000 {
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compatible = "foo,i-leak-current";
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reg = <0x12350000 0x1000>;
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power-domains = <&power 0>;
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required-opp = <&domain0_opp_0>;
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};
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leaky-device1@12350000 {
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compatible = "foo,i-leak-current";
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reg = <0x12350000 0x1000>;
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power-domains = <&power 1>;
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required-opp = <&domain1_opp_1>;
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};
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[1]. Documentation/devicetree/bindings/power/domain-idle-state.txt

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