linux-kernel - Re: What does ISA/PCI really mean to ARM architecture?

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Message-ID: <CAMuHMdWbyrDaaV5TWiEafEpjuscoGKXKKYzNBw_CSSWYLbNaPQ@mail.gmail.com>
Date:	Thu, 27 Dec 2012 10:51:40 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Woody Wu <narkewoody@...il.com>
Cc:	kernelnewbies@...nelnewbies.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: What does ISA/PCI really mean to ARM architecture?

On Thu, Dec 27, 2012 at 9:27 AM, Woody Wu <narkewoody@...il.com> wrote:
> Can a peripheral chip that claims to be ISA or PCI device be used in a
> ARM based embedded system?  For these kind of chips, I only concern
> about the planar kind of devices, means they are not on a dedicated
> expansion card.
>
> From hardware point of view, to attach a ISA or PCI planar chip, is
> there any requirement need to fulfill on a ARM bard?
>
> From Linux driver point of view, what are needed to support an ISA or
> PCI driver in ARM architecture?  More important, is ISA or PCI device a
> platform device?  If not, how to add these kind of devices in my board
> definition?

An ISA device is typically a platform device. For ARM, which uses device trees,
this means you define it in the device tree.

A PCI device is not a platform device, as devices on a PCI bus can be
probed automatically. The PCI host bridge is typically a platform device,
though, so it it should be in your device tree.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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