linux-kernel - Re: [PATCH 01/21] of: Add cpu node iterator for_each_of_cpu

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Message-ID: <CAL_JsqJmx_vjQfYMTFc5K4Sy4hEVXJi5p2PNL8uCpiyTdSir3A@mail.gmail.com>
Date:   Thu, 1 Nov 2018 10:57:31 -0500
From:   Rob Herring <robh@...nel.org>
To:     segher@...nel.crashing.org
Cc:     Michael Ellerman <mpe@...erman.id.au>, devicetree@...r.kernel.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
Subject: Re: [PATCH 01/21] of: Add cpu node iterator for_each_of_cpu_node()

On Thu, Nov 1, 2018 at 10:12 AM Segher Boessenkool
<segher@...nel.crashing.org> wrote:
>
> On Thu, Nov 01, 2018 at 09:52:57PM +1100, Michael Ellerman wrote:
> > Rob Herring <robh@...nel.org> writes:
> > > Yes, I was aware at least older powerpc DTs don't use 'cpu' for node names.
> >
> > Actually newer ones too, see below :)
>
> Good, because that is required by the Open Firmware standard (the PowerPC
> binding, to be exact):
>
> http://www.openbios.org/data/docs/ppc-2_1.ps
>
> (see 5.1.4, "name").

Yes. I should say I only expect systems following ePAPR (3.7) or DT
Spec will use 'cpu' node names. Those specs also require 'device_type'
which is supposed to indicate what OF methods are available for a node
which doesn't exist on FDT.

Rob