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Date:   Thu, 18 Aug 2022 23:36:13 +0200
From:   Pali =?utf-8?B?Um9ow6Fy?= <pali@kernel.org>
To:     Rob Herring <robh@kernel.org>
Cc:     Marek =?utf-8?B?QmVow7pu?= <kabel@kernel.org>,
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Subject: Re: [PATCH] dt-bindings: bus: add device tree bindings for
 fsl,p1021rdb-pc-cpld
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On Tuesday 12 July 2022 11:05:35 Rob Herring wrote:
> On Wed, Jul 06, 2022 at 06:56:02PM +0200, Marek Behún wrote:
> > On Tue, 5 Jul 2022 14:09:36 -0600
> > Rob Herring <robh+dt@kernel.org> wrote:
> > 
> > > Not really a simple-bus if it has registers to init/program the bus.
> > 
> > It doesn't.
> 
> Then what is in 'reg'? It looks the same range as 'ranges', so maybe you 
> don't need 'reg'.
> 
> Rob

Without 'reg' kernel cannot register devices on this bus, e.g.
register-bit-led does not work. So 'reg' is needed. Why? I do not know.