linux-kernel - Re: [PATCH 0/4] Decouple X86_32 dependency from the ISA Kconfig option

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Date:	Wed, 13 Apr 2016 16:38:38 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	William Breathitt Gray <vilhelm.gray@...il.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	gregkh@...uxfoundation.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [PATCH 0/4] Decouple X86_32 dependency from the ISA Kconfig
 option


* William Breathitt Gray <vilhelm.gray@...il.com> wrote:

> On Wed, Apr 13, 2016 at 09:26:02AM +0200, Ingo Molnar wrote:
> >What's the practical motivation of this? What exact hardware is this for?
> >
> >Thanks,
> >
> >	Ingo
> 
> The PC/104 bus is equivalent to the ISA bus regarding software
> communication. Many small form factor systems have a PC/104 bus where
> PC/104 cards may be stacked. Nowadays, these systems are commonly
> running 64-bit processors such as the Intel Atom.
> 
> I would like to utilize the ISA bus driver to support these PC/104
> devices (see http://lkml.org/lkml/2016/4/7/418), but the ISA
> configuration option has an arbitrary X86_32 dependency. Decoupling the
> X86_32 dependency from the ISA configuration option will allow these
> PC/104 drivers to build for 64-bit architectures.
> 
> The existing kernel drivers which I intend to utilize the ISA bus driver
> in a X86_64 architecture for PC/104 support are the ACCES 104-DIO-48E
> GPIO driver, the ACCES 104-IDI-48 GPIO driver, the ACCES 104-IDIO-16
> GPIO driver, and the Apex Embedded Systems STX104 DAC driver. I have
> several more PC/104 devices for which I wish to write drivers, but I
> would like to resolve this ISA bus driver situation before submitting
> new code.

Ah, ok, so it's for enabling real hardware, not just a cleanup, right? You might 
want to put that info into the boilerplate mail or so.

I'm perfectly fine with all the patches that touch x86 code:

  Acked-by: Ingo Molnar <mingo@...nel.org>

I suppose you'd like to have these in the driver tree, all in one place?

Thanks,

	Ingo