linux-kernel - Re: [RFC PATCH 0/3] m68k goes DT

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Message-ID: <20250106113749.GA32654@allandria.com>
Date: Mon, 6 Jan 2025 03:37:49 -0800
From: Brad Boyer <flar@...andria.com>
To: Greg Ungerer <gerg@...nel.org>
Cc: Daniel Palmer <daniel@...f.com>, geert@...ux-m68k.org,
	fthain@...ux-m68k.org, linux-m68k@...ts.linux-m68k.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/3] m68k goes DT

On Mon, Jan 06, 2025 at 12:59:04AM +1000, Greg Ungerer wrote:
> On 5/1/25 17:14, Daniel Palmer wrote:
> >Short version:
> >I want to start converting m68k (including nommu) to use DT for booting
> >so I can add few cool boards I have (e.g. dual 040/060 VME board..).
> >I need ideas, help etc. Maybe if someone converted an m68k machine they
> >are using to DT alongside me this would have some hope of actually happening?
> 
> I have been thinking about this for a while for the ColdFire targets.
> In a few cases the drivers its uses are already devicetree enabled,
> since they are used on some of the NXP/Freescale ARM SoC devices.
> So this is interesting work to me.

The m68k mac platform is similar in this due to sharing some drivers
with ppc macs using Open Firmware. There are a few drivers where we
could eliminate complexity and #ifdef trickery if it was all
device tree based. For example, pmac_zilog.c relies on the data from
OF on a powermac but is getting platform data from the tables in
config.c on m68k. The code in via-cuda.c similarly looks up the
hardware info from OF on a powermac but has hard-coded data on m68k.

	Brad Boyer
	flar@...andria.com