linux-kernel - Re: [PATCH 3/6] ARM: dts: sun8i: add a cpu0 label to cpu@0 node on A23/33

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Date:   Wed, 14 Dec 2016 00:31:38 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Icenowy Zheng <icenowy@...c.xyz>,
        Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Jorik Jonker <jorik@...pendief.biz>,
        Hans de Goede <hdegoede@...hat.com>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 3/6] ARM: dts: sun8i: add a cpu0 label to cpu@0 node on A23/33

On Wed, Dec 14, 2016 at 12:09 AM, Sudeep Holla <sudeep.holla@....com> wrote:
>
>
> On 13/12/16 15:22, Icenowy Zheng wrote:
>> A "cpu0" label is needed on cpu@0 for cpufreq-dt to work.
>>
>
> IIUC any label should be fine and I don't see anything in the driver
> looking for such label name. All I see is it looks for cpu0 regulator
> for *legacy* DTs
>
>> Add such a label, in order to prepare for cpufreq support of A23/33.
>>
>
> You need this as you add the same label in the following patches. The
> commit message sounds like cpufreq-dt search for that label by name.

I think a more proper explanation would be:

The cpu's supply regulator is specified at the board level, hence we
need to add a label to it to reference it without replicating the whole
tree structure.

ChenYu