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Date: Wed, 04 Apr 2007 11:13:12 +1000
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: David Woodhouse <dwmw2@...radead.org>
Cc: David Miller <davem@...emloft.net>, flar@...andria.com,
paulus@...ba.org, linuxppc-dev@...abs.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Stop pmac_zilog from abusing 8250's device numbers.
On Tue, 2007-04-03 at 20:12 -0400, David Woodhouse wrote:
> On Tue, 2007-04-03 at 17:02 -0700, David Miller wrote:
> > Sparc does the same thing, it's a common convention and you really
> > should not break it.
>
> I thought that argument was lost many years ago. It _used_ to be a
> common convention; we got better.
>
> > Every powerpc and sparc system out that is using ttyS0 with dynamic
> > minor numbers being allocated. I really think this should be
> > generalized instead of breaking serial on every powerpc machine out
> > there.
>
> Nobody's breaking anything. The patch _fixes_ serial, and allows powerpc
> machines to use both z8530 and 8250 ports at the same time; something
> which has been broken for a long time.
It worked before the new serial core, we had a "tweak" in the old 8250
driver to be able to share minors, but that got busted when Russell
rewrote the whole thing. I remember asking him back when he still was
the serial maintainer, and he refused to bring back some sharing of
minors.
Ben.
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