linux-kernel - Re: sysfs for my chips

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Message-ID: <CAMuHMdU_90EhPng0NYPVmWAwDt2NOowB3thPB+jJarme-A7eew@mail.gmail.com>
Date:	Fri, 11 Oct 2013 08:52:00 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>, Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: sysfs for my chips

On Thu, Oct 10, 2013 at 11:30 PM, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
> On Thu, 2013-10-10 at 22:26 +0200, Geert Uytterhoeven wrote:
>> > This is not CPUs. CPUs are threads really. Even if they were cores,
>> that
>> > still wouldn't cut it. I'm looking at chips here and not all of them
>> > actually processor chips. The SCOM bus address space is global to a
>> > physical chip and allows to access various resources that are only
>> > remotely related to the cores on it.
>>
>> What about a "bus" for the sideband bus? That allows to decouple it
>> from cores, and allows to support non-processor chips, too?
>
> Not sure what you mean .... create a linux bus type with devices on
> it ?

Yes, that's what I meant.

>From the nodes on that bus you can have symlinks in sysfs to e.g. the CPUs
in the rest of the sysfs tree.

It's a bit like smbus/i2c connecting various peripherals that may also be
connected in some other way (e.g. media devices).

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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