linux-kernel - Re: [PATCH v2] arm64: dts: sdm845: Add PSCI cpuidle low power states

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Date:   Thu, 20 Dec 2018 15:55:58 -0700
From:   Lina Iyer <ilina@...eaurora.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     "Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-soc@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, Stephen Boyd <sboyd@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v2] arm64: dts: sdm845: Add PSCI cpuidle low power states

On Thu, Dec 20 2018 at 14:42 -0700, Doug Anderson wrote:
>Hi,
>
>On Fri, Nov 30, 2018 at 7:41 AM Lina Iyer <ilina@...eaurora.org> wrote:
>>
>> On Tue, Oct 30 2018 at 11:23 -0600, Raju P.L.S.S.S.N wrote:
>> >Add device bindings for cpuidle states for cpu devices.
>> >
>> >Cc: <devicetree@...r.kernel.org>
>> >Signed-off-by: Raju P.L.S.S.S.N <rplsssn@...eaurora.org>
>> >---
>> >Changes in v2
>> > - Address comments from Doug
>> >---
>> >---
>> > arch/arm64/boot/dts/qcom/sdm845.dtsi | 62 ++++++++++++++++++++++++++++++++++++
>> > 1 file changed, 62 insertions(+)
>> >
>> >diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> >index 0c9a2aa..3a8381e 100644
>> >--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> >+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
>> >@@ -96,6 +96,7 @@
>> >                       reg = <0x0 0x0>;
>> >                       enable-method = "psci";
>> >                       next-level-cache = <&L2_0>;
>> >+                      cpu-idle-states = <&C0_CPU_PD &C0_CPU_RPD &CLUSTER_PD>;
>> I think it might be better to use
>> <&C0_CPU_PD>, <&C0_CPU_RPD>, <&CLUSTER_PD>
>
>I disagree.  All existing examples in both bindings and other device
>trees use the syntax that Raju uses.  It doesn't matter
>functionality-wise, but I'd much rather match everyone else.  We
>should land what Raju has posted and if someone feels super strongly
>that the examples in the bindings are wrong then they should attempt
>to convince Rob Herring to Ack a change to the examples in the
>bindings.  Doesn't seem like a good use of time to me, though.
>
No strong preference from my end.

-- Lina