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@xxxxxxxxxx> 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.