Add "clock-frequency" property to avoid below warning on i.MX7ULP:
[ 0.011762] /cpus/cpu@0 missing clock-frequency property
Signed-off-by: Anson Huang <[email protected]>
---
arch/arm/boot/dts/imx7ulp.dtsi | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/imx7ulp.dtsi b/arch/arm/boot/dts/imx7ulp.dtsi
index d37a192..87b2237 100644
--- a/arch/arm/boot/dts/imx7ulp.dtsi
+++ b/arch/arm/boot/dts/imx7ulp.dtsi
@@ -41,6 +41,7 @@
compatible = "arm,cortex-a7";
device_type = "cpu";
reg = <0>;
+ clock-frequency = <500210526>;
};
};
--
2.7.4
On Tue, Nov 05, 2019 at 09:49:38AM +0800, Anson Huang wrote:
> Add "clock-frequency" property to avoid below warning on i.MX7ULP:
>
> [ 0.011762] /cpus/cpu@0 missing clock-frequency property
>
> Signed-off-by: Anson Huang <[email protected]>
> ---
> arch/arm/boot/dts/imx7ulp.dtsi | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/boot/dts/imx7ulp.dtsi b/arch/arm/boot/dts/imx7ulp.dtsi
> index d37a192..87b2237 100644
> --- a/arch/arm/boot/dts/imx7ulp.dtsi
> +++ b/arch/arm/boot/dts/imx7ulp.dtsi
> @@ -41,6 +41,7 @@
> compatible = "arm,cortex-a7";
> device_type = "cpu";
> reg = <0>;
> + clock-frequency = <500210526>;
I cannot find the binding doc for this property. What is the
definition of it, the maximum frequency that the cpu could possibly run
at?
Shawn
> };
> };
>
> --
> 2.7.4
>
> Subject: Re: [PATCH] ARM: dts: imx7ulp: Add cpu clock-frequency property
>
> On Tue, Nov 05, 2019 at 09:49:38AM +0800, Anson Huang wrote:
> > Add "clock-frequency" property to avoid below warning on i.MX7ULP:
> >
> > [ 0.011762] /cpus/cpu@0 missing clock-frequency property
> >
> > Signed-off-by: Anson Huang <[email protected]>
> > ---
> > arch/arm/boot/dts/imx7ulp.dtsi | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/arm/boot/dts/imx7ulp.dtsi
> > b/arch/arm/boot/dts/imx7ulp.dtsi index d37a192..87b2237 100644
> > --- a/arch/arm/boot/dts/imx7ulp.dtsi
> > +++ b/arch/arm/boot/dts/imx7ulp.dtsi
> > @@ -41,6 +41,7 @@
> > compatible = "arm,cortex-a7";
> > device_type = "cpu";
> > reg = <0>;
> > + clock-frequency = <500210526>;
>
> I cannot find the binding doc for this property. What is the definition of it,
> the maximum frequency that the cpu could possibly run at?
The code is as below, maybe the property is missing from the beginning of this code,
this property should mean the current frequency of CPU running at I think:
arch/arm/kernel/topology.c
122 rate = of_get_property(cn, "clock-frequency", &len);
123 if (!rate || len != 4) {
124 pr_err("%pOF missing clock-frequency property\n", cn);
125 continue;
126 }
Thanks,
Anson
+ Vincent
On Tue, Dec 03, 2019 at 01:09:22AM +0000, Anson Huang wrote:
>
> > Subject: Re: [PATCH] ARM: dts: imx7ulp: Add cpu clock-frequency property
> >
> > On Tue, Nov 05, 2019 at 09:49:38AM +0800, Anson Huang wrote:
> > > Add "clock-frequency" property to avoid below warning on i.MX7ULP:
> > >
> > > [ 0.011762] /cpus/cpu@0 missing clock-frequency property
> > >
> > > Signed-off-by: Anson Huang <[email protected]>
> > > ---
> > > arch/arm/boot/dts/imx7ulp.dtsi | 1 +
> > > 1 file changed, 1 insertion(+)
> > >
> > > diff --git a/arch/arm/boot/dts/imx7ulp.dtsi
> > > b/arch/arm/boot/dts/imx7ulp.dtsi index d37a192..87b2237 100644
> > > --- a/arch/arm/boot/dts/imx7ulp.dtsi
> > > +++ b/arch/arm/boot/dts/imx7ulp.dtsi
> > > @@ -41,6 +41,7 @@
> > > compatible = "arm,cortex-a7";
> > > device_type = "cpu";
> > > reg = <0>;
> > > + clock-frequency = <500210526>;
> >
> > I cannot find the binding doc for this property. What is the definition of it,
> > the maximum frequency that the cpu could possibly run at?
>
>
> The code is as below, maybe the property is missing from the beginning of this code,
> this property should mean the current frequency of CPU running at I think:
>
> arch/arm/kernel/topology.c
>
> 122 rate = of_get_property(cn, "clock-frequency", &len);
> 123 if (!rate || len != 4) {
> 124 pr_err("%pOF missing clock-frequency property\n", cn);
> 125 continue;
> 126 }
Yes, I can find the code, but not bindings for it. Considering
frequency of a CPU can be scaled in a quite wide range, we need
a clear understanding on this property. IIUIC, the property is used to
calculate the capacity of CPU, it should be the maximum frequency the
CPU could possibly scale to?
Shawn