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Subject: Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and T4240QDS
From: Scott Wood <scottwood@freescale.com>
To: Tang Yuantian-B29983 <B29983@freescale.com>
Date: Fri, 6 Sep 2013 10:17:17 -0500
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Cc: Wood Scott-B07421 <B07421@freescale.com>,
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On Thu, 2013-09-05 at 21:30 -0500, Tang Yuantian-B29983 wrote:
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: 2013=E5=B9=B49=E6=9C=886=E6=97=A5 =E6=98=9F=E6=9C=9F=E4=BA=94 2=
:41
> > To: Tang Yuantian-B29983
> > Cc: Yang,Wei; Jia Hongtao-B38951; Wood Scott-B07421; linuxppc-
> > dev@lists.ozlabs.org
> > Subject: Re: [PATCH] powerpc: Add I2C bus multiplexer node for B4 and
> > T4240QDS
> >=20
> > On Tue, 2013-09-03 at 22:30 -0500, Tang Yuantian-B29983 wrote:
> > > Hi,
> > >
> > > These eeproms are never used by kernel. So no need to add them.
> >=20
> > The device tree describes the hardware, not what Linux does with it.
> >=20
> Missing some nodes doesn't mean it is not describing the hardware.
> There are almost fifty I2C devices on T4 connected to PCA9547.
> Do you think we need to list them all?

Ideally, yes.  I realize it's not uncommon for some things to be
missing, but that's not a reason to tell people to leave things out just
because Linux doesn't use them.

-Scott