mirror of
https://github.com/torvalds/linux.git
synced 2024-12-18 00:53:40 +00:00
754dcf35f3
It would be better to name OPP nodes as opp@<opp-hz> as that will ensure that multiple DT nodes don't contain the same frequency. Of course we expect the writer to name the node with its opp-hz frequency and not any other frequency. And that will let the compile error out if multiple nodes are using the same opp-hz frequency. Suggested-by: Stephen Boyd <sboyd@codeaurora.org> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
520 lines
14 KiB
Plaintext
520 lines
14 KiB
Plaintext
Generic OPP (Operating Performance Points) Bindings
|
|
----------------------------------------------------
|
|
|
|
Devices work at voltage-current-frequency combinations and some implementations
|
|
have the liberty of choosing these. These combinations are called Operating
|
|
Performance Points aka OPPs. This document defines bindings for these OPPs
|
|
applicable across wide range of devices. For illustration purpose, this document
|
|
uses CPU as a device.
|
|
|
|
This document contain multiple versions of OPP binding and only one of them
|
|
should be used per device.
|
|
|
|
Binding 1: operating-points
|
|
============================
|
|
|
|
This binding only supports voltage-frequency pairs.
|
|
|
|
Properties:
|
|
- operating-points: An array of 2-tuples items, and each item consists
|
|
of frequency and voltage like <freq-kHz vol-uV>.
|
|
freq: clock frequency in kHz
|
|
vol: voltage in microvolt
|
|
|
|
Examples:
|
|
|
|
cpu@0 {
|
|
compatible = "arm,cortex-a9";
|
|
reg = <0>;
|
|
next-level-cache = <&L2>;
|
|
operating-points = <
|
|
/* kHz uV */
|
|
792000 1100000
|
|
396000 950000
|
|
198000 850000
|
|
>;
|
|
};
|
|
|
|
|
|
Binding 2: operating-points-v2
|
|
============================
|
|
|
|
* Property: operating-points-v2
|
|
|
|
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.
|
|
|
|
If required, this can be extended for SoC vendor specfic 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>".
|
|
|
|
* OPP Table Node
|
|
|
|
This describes the OPPs belonging to a device. This node can have following
|
|
properties:
|
|
|
|
Required properties:
|
|
- compatible: Allow OPPs to express their compatibility. It should be:
|
|
"operating-points-v2".
|
|
|
|
- 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.
|
|
|
|
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,
|
|
but they share OPP tables.
|
|
|
|
- status: Marks the OPP table enabled/disabled.
|
|
|
|
|
|
* OPP Node
|
|
|
|
This defines voltage-current-frequency combinations along with other related
|
|
properties.
|
|
|
|
Required properties:
|
|
- opp-hz: Frequency in Hz, expressed as a 64-bit big-endian integer.
|
|
|
|
Optional properties:
|
|
- opp-microvolt: voltage in micro Volts.
|
|
|
|
A single regulator's voltage is specified with an array of size one or three.
|
|
Single entry is for target voltage and three entries are for <target min max>
|
|
voltages.
|
|
|
|
Entries for multiple regulators must be present in the same order as
|
|
regulators are specified in device's DT node.
|
|
|
|
- opp-microvolt-<name>: Named opp-microvolt property. This is exactly similar to
|
|
the above opp-microvolt property, but allows multiple voltage ranges to be
|
|
provided for the same OPP. At runtime, the platform can pick a <name> and
|
|
matching opp-microvolt-<name> property will be enabled for all OPPs. If the
|
|
platform doesn't pick a specific <name> or the <name> doesn't match with any
|
|
opp-microvolt-<name> properties, then opp-microvolt property shall be used, if
|
|
present.
|
|
|
|
- opp-microamp: The maximum current drawn by the device in microamperes
|
|
considering system specific parameters (such as transients, process, aging,
|
|
maximum operating temperature range etc.) as necessary. This may be used to
|
|
set the most efficient regulator operating mode.
|
|
|
|
Should only be set if opp-microvolt is set for the OPP.
|
|
|
|
Entries for multiple regulators must be present in the same order as
|
|
regulators are specified in device's DT node. If this property isn't required
|
|
for few regulators, then this should be marked as zero for them. If it isn't
|
|
required for any regulator, then this property need not be present.
|
|
|
|
- opp-microamp-<name>: Named opp-microamp property. Similar to
|
|
opp-microvolt-<name> property, but for microamp instead.
|
|
|
|
- clock-latency-ns: Specifies the maximum possible transition latency (in
|
|
nanoseconds) for switching to this OPP from any other OPP.
|
|
|
|
- turbo-mode: Marks the OPP to be used only for turbo modes. Turbo mode is
|
|
available on some platforms, where the device can run over its operating
|
|
frequency for a short duration of time limited by the device's power, current
|
|
and thermal limits.
|
|
|
|
- opp-suspend: Marks the OPP to be used during device suspend. Only one OPP in
|
|
the table should have this.
|
|
|
|
- opp-supported-hw: This enables us to select only a subset of OPPs from the
|
|
larger OPP table, based on what version of the hardware we are running on. We
|
|
still can't have multiple nodes with the same opp-hz value in OPP table.
|
|
|
|
It's an user defined array containing a hierarchy of hardware version numbers,
|
|
supported by the OPP. For example: a platform with hierarchy of three levels
|
|
of versions (A, B and C), this field should be like <X Y Z>, where X
|
|
corresponds to Version hierarchy A, Y corresponds to version hierarchy B and Z
|
|
corresponds to version hierarchy C.
|
|
|
|
Each level of hierarchy is represented by a 32 bit value, and so there can be
|
|
only 32 different supported version per hierarchy. i.e. 1 bit per version. A
|
|
value of 0xFFFFFFFF will enable the OPP for all versions for that hierarchy
|
|
level. And a value of 0x00000000 will disable the OPP completely, and so we
|
|
never want that to happen.
|
|
|
|
If 32 values aren't sufficient for a version hierarchy, than that version
|
|
hierarchy can be contained in multiple 32 bit values. i.e. <X Y Z1 Z2> in the
|
|
above example, Z1 & Z2 refer to the version hierarchy Z.
|
|
|
|
- status: Marks the node enabled/disabled.
|
|
|
|
Example 1: Single cluster Dual-core ARM cortex A9, switch DVFS states together.
|
|
|
|
/ {
|
|
cpus {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
cpu@0 {
|
|
compatible = "arm,cortex-a9";
|
|
reg = <0>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 0>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply0>;
|
|
operating-points-v2 = <&cpu0_opp_table>;
|
|
};
|
|
|
|
cpu@1 {
|
|
compatible = "arm,cortex-a9";
|
|
reg = <1>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 0>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply0>;
|
|
operating-points-v2 = <&cpu0_opp_table>;
|
|
};
|
|
};
|
|
|
|
cpu0_opp_table: opp_table0 {
|
|
compatible = "operating-points-v2";
|
|
opp-shared;
|
|
|
|
opp@1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt = <970000 975000 985000>;
|
|
opp-microamp = <70000>;
|
|
clock-latency-ns = <300000>;
|
|
opp-suspend;
|
|
};
|
|
opp@1100000000 {
|
|
opp-hz = /bits/ 64 <1100000000>;
|
|
opp-microvolt = <980000 1000000 1010000>;
|
|
opp-microamp = <80000>;
|
|
clock-latency-ns = <310000>;
|
|
};
|
|
opp@1200000000 {
|
|
opp-hz = /bits/ 64 <1200000000>;
|
|
opp-microvolt = <1025000>;
|
|
clock-latency-ns = <290000>;
|
|
turbo-mode;
|
|
};
|
|
};
|
|
};
|
|
|
|
Example 2: Single cluster, Quad-core Qualcom-krait, switches DVFS states
|
|
independently.
|
|
|
|
/ {
|
|
cpus {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
cpu@0 {
|
|
compatible = "qcom,krait";
|
|
reg = <0>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 0>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply0>;
|
|
operating-points-v2 = <&cpu_opp_table>;
|
|
};
|
|
|
|
cpu@1 {
|
|
compatible = "qcom,krait";
|
|
reg = <1>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 1>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply1>;
|
|
operating-points-v2 = <&cpu_opp_table>;
|
|
};
|
|
|
|
cpu@2 {
|
|
compatible = "qcom,krait";
|
|
reg = <2>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 2>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply2>;
|
|
operating-points-v2 = <&cpu_opp_table>;
|
|
};
|
|
|
|
cpu@3 {
|
|
compatible = "qcom,krait";
|
|
reg = <3>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 3>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply3>;
|
|
operating-points-v2 = <&cpu_opp_table>;
|
|
};
|
|
};
|
|
|
|
cpu_opp_table: opp_table {
|
|
compatible = "operating-points-v2";
|
|
|
|
/*
|
|
* Missing opp-shared property means CPUs switch DVFS states
|
|
* independently.
|
|
*/
|
|
|
|
opp@1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt = <970000 975000 985000>;
|
|
opp-microamp = <70000>;
|
|
clock-latency-ns = <300000>;
|
|
opp-suspend;
|
|
};
|
|
opp@1100000000 {
|
|
opp-hz = /bits/ 64 <1100000000>;
|
|
opp-microvolt = <980000 1000000 1010000>;
|
|
opp-microamp = <80000>;
|
|
clock-latency-ns = <310000>;
|
|
};
|
|
opp@1200000000 {
|
|
opp-hz = /bits/ 64 <1200000000>;
|
|
opp-microvolt = <1025000>;
|
|
opp-microamp = <90000;
|
|
lock-latency-ns = <290000>;
|
|
turbo-mode;
|
|
};
|
|
};
|
|
};
|
|
|
|
Example 3: Dual-cluster, Dual-core per cluster. CPUs within a cluster switch
|
|
DVFS state together.
|
|
|
|
/ {
|
|
cpus {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
|
|
cpu@0 {
|
|
compatible = "arm,cortex-a7";
|
|
reg = <0>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 0>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply0>;
|
|
operating-points-v2 = <&cluster0_opp>;
|
|
};
|
|
|
|
cpu@1 {
|
|
compatible = "arm,cortex-a7";
|
|
reg = <1>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 0>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply0>;
|
|
operating-points-v2 = <&cluster0_opp>;
|
|
};
|
|
|
|
cpu@100 {
|
|
compatible = "arm,cortex-a15";
|
|
reg = <100>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 1>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply1>;
|
|
operating-points-v2 = <&cluster1_opp>;
|
|
};
|
|
|
|
cpu@101 {
|
|
compatible = "arm,cortex-a15";
|
|
reg = <101>;
|
|
next-level-cache = <&L2>;
|
|
clocks = <&clk_controller 1>;
|
|
clock-names = "cpu";
|
|
cpu-supply = <&cpu_supply1>;
|
|
operating-points-v2 = <&cluster1_opp>;
|
|
};
|
|
};
|
|
|
|
cluster0_opp: opp_table0 {
|
|
compatible = "operating-points-v2";
|
|
opp-shared;
|
|
|
|
opp@1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt = <970000 975000 985000>;
|
|
opp-microamp = <70000>;
|
|
clock-latency-ns = <300000>;
|
|
opp-suspend;
|
|
};
|
|
opp@1100000000 {
|
|
opp-hz = /bits/ 64 <1100000000>;
|
|
opp-microvolt = <980000 1000000 1010000>;
|
|
opp-microamp = <80000>;
|
|
clock-latency-ns = <310000>;
|
|
};
|
|
opp@1200000000 {
|
|
opp-hz = /bits/ 64 <1200000000>;
|
|
opp-microvolt = <1025000>;
|
|
opp-microamp = <90000>;
|
|
clock-latency-ns = <290000>;
|
|
turbo-mode;
|
|
};
|
|
};
|
|
|
|
cluster1_opp: opp_table1 {
|
|
compatible = "operating-points-v2";
|
|
opp-shared;
|
|
|
|
opp@1300000000 {
|
|
opp-hz = /bits/ 64 <1300000000>;
|
|
opp-microvolt = <1045000 1050000 1055000>;
|
|
opp-microamp = <95000>;
|
|
clock-latency-ns = <400000>;
|
|
opp-suspend;
|
|
};
|
|
opp@1400000000 {
|
|
opp-hz = /bits/ 64 <1400000000>;
|
|
opp-microvolt = <1075000>;
|
|
opp-microamp = <100000>;
|
|
clock-latency-ns = <400000>;
|
|
};
|
|
opp@1500000000 {
|
|
opp-hz = /bits/ 64 <1500000000>;
|
|
opp-microvolt = <1010000 1100000 1110000>;
|
|
opp-microamp = <95000>;
|
|
clock-latency-ns = <400000>;
|
|
turbo-mode;
|
|
};
|
|
};
|
|
};
|
|
|
|
Example 4: Handling multiple regulators
|
|
|
|
/ {
|
|
cpus {
|
|
cpu@0 {
|
|
compatible = "arm,cortex-a7";
|
|
...
|
|
|
|
cpu-supply = <&cpu_supply0>, <&cpu_supply1>, <&cpu_supply2>;
|
|
operating-points-v2 = <&cpu0_opp_table>;
|
|
};
|
|
};
|
|
|
|
cpu0_opp_table: opp_table0 {
|
|
compatible = "operating-points-v2";
|
|
opp-shared;
|
|
|
|
opp@1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt = <970000>, /* Supply 0 */
|
|
<960000>, /* Supply 1 */
|
|
<960000>; /* Supply 2 */
|
|
opp-microamp = <70000>, /* Supply 0 */
|
|
<70000>, /* Supply 1 */
|
|
<70000>; /* Supply 2 */
|
|
clock-latency-ns = <300000>;
|
|
};
|
|
|
|
/* OR */
|
|
|
|
opp@1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt = <970000 975000 985000>, /* Supply 0 */
|
|
<960000 965000 975000>, /* Supply 1 */
|
|
<960000 965000 975000>; /* Supply 2 */
|
|
opp-microamp = <70000>, /* Supply 0 */
|
|
<70000>, /* Supply 1 */
|
|
<70000>; /* Supply 2 */
|
|
clock-latency-ns = <300000>;
|
|
};
|
|
|
|
/* OR */
|
|
|
|
opp@1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt = <970000 975000 985000>, /* Supply 0 */
|
|
<960000 965000 975000>, /* Supply 1 */
|
|
<960000 965000 975000>; /* Supply 2 */
|
|
opp-microamp = <70000>, /* Supply 0 */
|
|
<0>, /* Supply 1 doesn't need this */
|
|
<70000>; /* Supply 2 */
|
|
clock-latency-ns = <300000>;
|
|
};
|
|
};
|
|
};
|
|
|
|
Example 5: opp-supported-hw
|
|
(example: three level hierarchy of versions: cuts, substrate and process)
|
|
|
|
/ {
|
|
cpus {
|
|
cpu@0 {
|
|
compatible = "arm,cortex-a7";
|
|
...
|
|
|
|
cpu-supply = <&cpu_supply>
|
|
operating-points-v2 = <&cpu0_opp_table_slow>;
|
|
};
|
|
};
|
|
|
|
opp_table {
|
|
compatible = "operating-points-v2";
|
|
status = "okay";
|
|
opp-shared;
|
|
|
|
opp@600000000 {
|
|
/*
|
|
* Supports all substrate and process versions for 0xF
|
|
* cuts, i.e. only first four cuts.
|
|
*/
|
|
opp-supported-hw = <0xF 0xFFFFFFFF 0xFFFFFFFF>
|
|
opp-hz = /bits/ 64 <600000000>;
|
|
opp-microvolt = <900000 915000 925000>;
|
|
...
|
|
};
|
|
|
|
opp@800000000 {
|
|
/*
|
|
* Supports:
|
|
* - cuts: only one, 6th cut (represented by 6th bit).
|
|
* - substrate: supports 16 different substrate versions
|
|
* - process: supports 9 different process versions
|
|
*/
|
|
opp-supported-hw = <0x20 0xff0000ff 0x0000f4f0>
|
|
opp-hz = /bits/ 64 <800000000>;
|
|
opp-microvolt = <900000 915000 925000>;
|
|
...
|
|
};
|
|
};
|
|
};
|
|
|
|
Example 6: opp-microvolt-<name>, opp-microamp-<name>:
|
|
(example: device with two possible microvolt ranges: slow and fast)
|
|
|
|
/ {
|
|
cpus {
|
|
cpu@0 {
|
|
compatible = "arm,cortex-a7";
|
|
...
|
|
|
|
operating-points-v2 = <&cpu0_opp_table>;
|
|
};
|
|
};
|
|
|
|
cpu0_opp_table: opp_table0 {
|
|
compatible = "operating-points-v2";
|
|
opp-shared;
|
|
|
|
opp@1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt-slow = <900000 915000 925000>;
|
|
opp-microvolt-fast = <970000 975000 985000>;
|
|
opp-microamp-slow = <70000>;
|
|
opp-microamp-fast = <71000>;
|
|
};
|
|
|
|
opp@1200000000 {
|
|
opp-hz = /bits/ 64 <1200000000>;
|
|
opp-microvolt-slow = <900000 915000 925000>, /* Supply vcc0 */
|
|
<910000 925000 935000>; /* Supply vcc1 */
|
|
opp-microvolt-fast = <970000 975000 985000>, /* Supply vcc0 */
|
|
<960000 965000 975000>; /* Supply vcc1 */
|
|
opp-microamp = <70000>; /* Will be used for both slow/fast */
|
|
};
|
|
};
|
|
};
|