RE: [PATCH 1/2] ARM: dts: imx7s: enable cpuidle driver
From: Anson Huang
Date: Sun Sep 02 2018 - 21:50:55 EST
Anson Huang
Best Regards!
> -----Original Message-----
> From: Shawn Guo <shawnguo@xxxxxxxxxx>
> Sent: Monday, September 3, 2018 9:16 AM
> To: Anson Huang <anson.huang@xxxxxxx>
> Cc: s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx; Fabio Estevam
> <fabio.estevam@xxxxxxx>; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx;
> linux@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; dl-linux-imx
> <linux-imx@xxxxxxx>
> Subject: Re: [PATCH 1/2] ARM: dts: imx7s: enable cpuidle driver
>
> On Wed, Aug 29, 2018 at 01:00:46PM +0800, Anson Huang wrote:
> > Enable cpuidle for i.MX7S/D using generic ARM cpuidle driver, below 2
> > idle states enabled:
> >
> > 1. ARM WFI;
> > 2. SoC WAIT mode.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
> > ---
> > arch/arm/boot/dts/imx7d.dtsi | 1 +
> > arch/arm/boot/dts/imx7s.dtsi | 14 ++++++++++++++
> > 2 files changed, 15 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/imx7d.dtsi
> > b/arch/arm/boot/dts/imx7d.dtsi index 7cbc2ff..4d0d0f6 100644
> > --- a/arch/arm/boot/dts/imx7d.dtsi
> > +++ b/arch/arm/boot/dts/imx7d.dtsi
> > @@ -20,6 +20,7 @@
> > reg = <1>;
> > clock-frequency = <996000000>;
> > operating-points-v2 = <&cpu0_opp_table>;
> > + cpu-idle-states = <&CPU_SLEEP>;
> > };
> > };
> >
> > diff --git a/arch/arm/boot/dts/imx7s.dtsi
> > b/arch/arm/boot/dts/imx7s.dtsi index 93884ce..cf5570b 100644
> > --- a/arch/arm/boot/dts/imx7s.dtsi
> > +++ b/arch/arm/boot/dts/imx7s.dtsi
> > @@ -54,6 +54,19 @@
> > #address-cells = <1>;
> > #size-cells = <0>;
> >
> > + idle-states {
> > + entry-method = "psci";
> > +
> > + CPU_SLEEP: WAIT {
>
> I understand uppercase is allowed, but we conventionally use lowercase for
> label and node name. Can we do something like below?
>
> cpu_sleep_wait: cpu-sleep-wait {
> ...
> }
Sure, please review V2 patch, thanks!
Anson
>
> Shawn
>
> > + compatible = "arm,idle-state";
> > + arm,psci-suspend-param = <0x0010000>;
> > + local-timer-stop;
> > + entry-latency-us = <100>;
> > + exit-latency-us = <50>;
> > + min-residency-us = <1000>;
> > + };
> > + };
> > +
> > cpu0: cpu@0 {
> > compatible = "arm,cortex-a7";
> > device_type = "cpu";
> > @@ -61,6 +74,7 @@
> > clock-frequency = <792000000>;
> > clock-latency = <61036>; /* two CLK32 periods */
> > clocks = <&clks IMX7D_CLK_ARM>;
> > + cpu-idle-states = <&CPU_SLEEP>;
> > };
> > };
> >
> > --
> > 2.7.4
> >
> >
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