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

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Date:   Tue, 30 Oct 2018 09:52:00 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Raju P L S S S N <rplsssn@...eaurora.org>
Cc:     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>,
        Lina Iyer <ilina@...eaurora.org>
Subject: Re: [PATCH] arm64: dts: sdm845: Add PSCI cpuidle low power states

Resending since I accidentally clicked back to HTML and lists all bounced.  :(

On Tue, Oct 30, 2018 at 9:24 AM Raju P L S S S N <rplsssn@...eaurora.org> wrote:
>
> On 10/24/2018 12:06 AM, Doug Anderson wrote:
> > Hi,
> >
> > On Mon, Oct 15, 2018 at 10:02 AM Raju P.L.S.S.S.N
> > <rplsssn@...eaurora.org> wrote:
> >> +               idle-states {
> >> +                       entry-method = "psci";
> >> +
> >> +                       C0_CPU_SPC: c0_spc {
> >
> > nit: all these nodes should have dashes instead of spaces in the node
> > names (labels can still have spaces).  AKA:
> >
> > C0_CPU_SPC: c0-spc {
>
> Sure. I will change this. (However, from device tree specification v0.2,
> I see that Table 2.1 mentions underscore as valid character for node.
> Please correct me if I'm missing something)

You're right that I don't see it there.  I've always heard that they
are allowed but discouraged.  One place that mentions this:

https://elinux.org/Device_Tree_Linux

> Linux conventions
> * node names
>   * use dash "-" instead of underscore "_"

That same site points that the majority of people use dashes in node
names instead of underscores.

-Doug