linux-kernel - Re: [RFC PATCH 5/6] arm64: dts: ti: Add Support for AM654 SoC

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Date:   Tue, 5 Jun 2018 07:14:30 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Vignesh R <vigneshr@...com>, Tero Kristo <t-kristo@...com>,
        Russell King <linux@...linux.org.uk>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [RFC PATCH 5/6] arm64: dts: ti: Add Support for AM654 SoC

* Rob Herring <robh+dt@...nel.org> [180605 14:08]:
> On Tue, Jun 5, 2018 at 1:05 AM, Nishanth Menon <nm@...com> wrote:
> > +       soc0: soc0 {
> > +               compatible = "simple-bus";
> > +               #address-cells = <2>;
> > +               #size-cells = <2>;
> > +               ranges;
> 
> Really need 64-bit addresses and sizes? Use ranges to limit the
> address space if possible.

And in addition to using ranges, please set up separate bus instances
for the interconnects. This will then allow you to probe WKUP or
similar instance first and the other bus instances after. And that
pretty much allows you to get rid of the annoying -EPROBE_DEFER
ping pong and allows making clocks proper device drivers ;)

Regards,

Tony