| Message ID | 7948ab63fe5c92da280542a9a372349486d40c65.1557742902.git.leonard.crestez@nxp.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | viresh kumar |
| Headers | show |
| Series | cpufreq: Add imx-cpufreq-dt driver for speed grading | expand |
On Mon, 13 May 2019 11:01:39 +0000, Leonard Crestez wrote: > The interpretation of opp-supported-hw bits for imx-cpufreq-dt driver is > not very obvious so attempt to explain it. > > There is no OF compat string associated. > > Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> > --- > .../bindings/cpufreq/imx-cpufreq-dt.txt | 37 +++++++++++++++++++ > 1 file changed, 37 insertions(+) > create mode 100644 Documentation/devicetree/bindings/cpufreq/imx-cpufreq-dt.txt > Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/cpufreq/imx-cpufreq-dt.txt b/Documentation/devicetree/bindings/cpufreq/imx-cpufreq-dt.txt new file mode 100644 index 000000000000..87bff5add3f9 --- /dev/null +++ b/Documentation/devicetree/bindings/cpufreq/imx-cpufreq-dt.txt @@ -0,0 +1,37 @@ +i.MX CPUFreq-DT OPP bindings +================================ + +Certain i.MX SoCs support different OPPs depending on the "market segment" and +"speed grading" value which are written in fuses. These bits are combined with +the opp-supported-hw values for each OPP to check if the OPP is allowed. + +Required properties: +-------------------- + +For each opp entry in 'operating-points-v2' table: +- opp-supported-hw: Two bitmaps indicating: + - Supported speed grade mask + - Supported market segment mask + 0: Consumer + 1: Extended Consumer + 2: Industrial + 3: Automotive + +Example: +-------- + +opp_table { + compatible = "operating-points-v2"; + opp-1000000000 { + opp-hz = /bits/ 64 <1000000000>; + /* grade >= 0, consumer only */ + opp-supported-hw = <0xf>, <0x3>; + }; + + opp-1300000000 { + opp-hz = /bits/ 64 <1300000000>; + opp-microvolt = <1000000>; + /* grade >= 1, all segments */ + opp-supported-hw = <0xe>, <0x7>; + }; +}
The interpretation of opp-supported-hw bits for imx-cpufreq-dt driver is not very obvious so attempt to explain it. There is no OF compat string associated. Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com> --- .../bindings/cpufreq/imx-cpufreq-dt.txt | 37 +++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 Documentation/devicetree/bindings/cpufreq/imx-cpufreq-dt.txt