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Date: Sun, 09 Sep 2012 15:27:09 +0200
From: Richard Weinberger <richard@nod.at>
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Subject: Re: [uml-devel] Emulate I2C subsystem/slaves
To: =?ISO-8859-15?Q?Peter_H=FCwe?= <PeterHuewe@gmx.de>
Cc: Jean Delvare <khali@linux-fr.org>, Geert Uytterhoeven <geert@linux-m68k.org>, user-mode-linux-devel@lists.sourceforge.net
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Am 09.09.2012 15:11, schrieb Peter H=FCwe:
>>>> Maybe some parts of the I2C sub-system can also just depend on
>>>> GENERIC_IO instead of HAS_IOMEM.
>>>> An arch has GENERIC_IO=3Dy if it supports everything defined in
>>>> generic-asm/io.h which is more than enough for most stub drivers.
>>>
>>> The only thing which seems to be missing on UML is the ioremap functi=
on
>>> family ;/
>>
>> Why do you need ioremap() in a stub driver?
>> This sounds strange.
>=20
>=20
> This was a misunderstanding - the main part of the I2C subsystem doesn'=
t=20
> depend at all on HAS_IOMEM, only the main part of the i2c/busses sectio=
n.
> And almost all of those drivers use ioremap.

Sure. They need real hardware. :-)

> For my stub driver I don't need any of that, I'd be fine with the move =
of=20
> HAS_IOMEM as proposed by Jean.

IMHO you should replace the HAS_IOMEM with GENERIC_IO.
Otherwise you may break the build on s390.

Thanks,
//richard


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