Subject: Re: [Openipmi-developer] [patch 1/1] ipmi: add autosensing of ipmi device on powerpc using device-tree

From: Arnd Bergmann <[email-masked]>
Date: Sat, 9 Dec 2006 12:46:19 +0100

On Saturday 09 December 2006 10:46, Segher Boessenkool wrote:
> How do you know? =A0Some later compatible implementation might add
> some regs. =A0Also, there are implementations that simply ignore
> the lower address bits, so size=3D1 in the "reg" property is wrong
> for those.
>=20
> > but depending on the HW implementation, they may be
> > between 1 and 4 bytes wide, and can have a different spacing.
>=20
> Always one byte wide.

AFAICS, some implementations require word access on the registers,
even if only part of it is used. That's why the driver has
the concept of reg-size and reg-shift.

	Arnd <><