> On Thu, Sep 08, 2016 at 02:13:26PM +0100, Mark Rutland wrote:
> > On Mon, Sep 05, 2016 at 06:01:31PM +0800, shh.xie@xxxxxxxxx wrote:
> > > + cpus {
> > > + #address-cells = <1>;
> > > + #size-cells = <0>;
> > > +
> > > + cpu0: cpu@0 {
> > > + device_type = "cpu";
> > > + compatible = "arm,cortex-a72";
> > > + reg = <0x0>;
> > > + clocks = <&clockgen 1 0>;
> > > + next-level-cache = <&l2>;
> > > + cpu-idle-states = <&CPU_PH20>;
> > > + };
> >
> > [...]
> >
> > > + };
> > > +
> > > + idle-states {
> > > + entry-method = "arm,psci";
> > > +
> > > + CPU_PH20: cpu-ph20 {
> > > + compatible = "arm,idle-state";
> > > + idle-state-name = "PH20";
> > > + arm,psci-suspend-param = <0x00010000>;
> > > + entry-latency-us = <1000>;
> > > + exit-latency-us = <1000>;
> > > + min-residency-us = <3000>;
> > > + };
> > > + };
> >
> > There's no PSCI node in this file, and none from am included file, so
> > this doesn't look right.
>
> Looking again, none of the cpu nodes has an enable-method property, and
> subsequent patches don't seem to add that to any cpu node.
>
> Has this DT actually been tested?
[S.H] The PSCI node and the enable-method property are added by U-boot.
U-boot can determine if using PSCI. If U-boot enables PSCI, it will add these
missed parts in the dts. If not, it will not add these missed parts,
so kernel will not use PSCI.
In other words, the dts does not enable PSCI by default.
It's U-boot which adds the missed part if it determines to use PSCI.
Thanks,
Shaohui
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
