linux-kernel - Re: Platform device id

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Message-Id: <20070908001835.C7F721B729B@adsl-69-226-248-13.dsl.pltn13.pacbell.net>
Date:	Fri, 07 Sep 2007 17:18:35 -0700
From:	David Brownell <david-b@...bell.net>
To:	hmh@....eng.br
Cc:	linux-kernel@...r.kernel.org, khali@...ux-fr.org, gregkh@...e.de,
	dmitry.torokhov@...il.com
Subject: Re: Platform device id

> > (Also, note that "platform", "host", and "board" are ambiguous.
> > In some contexts each is synonymous; in others, not.  I avoid
>
> In this specific case I am talking about, they're not.

That is, in *YOUR* usage context they're not.  I had to parse
what you wrote a few times before your comments about $SUBJECT
started to make sense.  I've *never* heard "host" used that way,
and rarely hear "platform" used that way either.

> The platform for a ThinkPad is either i386 or amd64.

Both i386 and x86_64 are clearly an "arch".  They even live in
an "arch" directory:  linux/arch/{i386,x86_64}.

When folk talk about a "PC Platform", they're talking about a
thing that doesn't quite exist in today's Linux tree.  If we
ever get to an arch/x86, that could have a plat-pc (or mach-pc)
subdirectory.  ThinkPads should then be a variant of that.

> I don't feel like drivers like hdaps, thinkpad-acpi, dock, bay,
> and many others really belong in the platform bus.  But that's
> what happens right now.

As a rule, there needs to be a Good Reason to create a new bus
type.  A "feel" is a pretty weak reason...

- Dave

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