linux-kernel - Re: [PATCH 2/3] clk: mvebu: Use of_get_cpu

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Date:   Tue, 11 Apr 2023 09:04:01 -0500
From:   Rob Herring <robh@...nel.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Michael Turquette <mturquette@...libre.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH 2/3] clk: mvebu: Use of_get_cpu_hwid() to read CPU ID

On Mon, Apr 10, 2023 at 04:36:21PM -0700, Stephen Boyd wrote:
> Quoting Rob Herring (2023-03-27 11:43:19)
> > Use of_get_cpu_hwid() rather than the open coded reading of the CPU
> > nodes "reg" property. The existing code is in fact wrong as the "reg"
> > address cells size is 2 cells for arm64. The existing code happens to
> > work because the DTS files are wrong as well.
> > 
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> > Note this should be marked for stable so that if/when the DTS files are
> > fixed, then at least stable kernels will work. This is untested, so I
> > didn't mark for stable.
> 
> That makes it sound like it breaks for existing DTS files. Is that the
> case?

No, if the DTS files are fixed, then they will not work with the 
existing code. This change should work for both existing and fixed DTS 
files.

Rob