linux-kernel - Re: [PATCH v3 1/1] i2c: add ACPI support for I2C mux ports

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Message-ID: <20151021083406.GU1526@lahna.fi.intel.com>
Date:	Wed, 21 Oct 2015 11:34:06 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Dustin Byford <dustin@...ulusnetworks.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	rjw@...ysocki.net, andriy.shevchenko@...ux.intel.com
Subject: Re: [PATCH v3 1/1] i2c: add ACPI support for I2C mux ports

On Wed, Oct 21, 2015 at 01:21:16AM -0700, Dustin Byford wrote:
> On Wed Oct 21 11:12, Mika Westerberg wrote:
> > On Tue, Oct 20, 2015 at 10:49:59AM -0700, Dustin Byford wrote:
> > > I considered it, but I thought a default that fairly closely matches the
> > > old behavior was more convenient.
> > > 
> > > On the other hand, leaving it up to the controllers makes it all very
> > > explicit and perhaps simpler to reason about.
> > > 
> > > 
> > > I could be convinced either way.  But, if we move it to the controller
> > > drivers, which ones need the change?
> > > 
> > > grep -i acpi drivers/i2c/busses/i2c*
> > > 
> > > shows 18 drivers that might care.
> > 
> > I'm quite confident the designware I2C is enough for now. Intel uses it
> > for all SoCs with LPSS and I think AMD has the same block for their I2C
> > solution.
> 
> I certainly care about i801, ismt, and isch.  Doesn't this affect any
> i2c controller with clients that may be enumerated through ACPI?

Yes, but so far I haven't seen any other devices being used for this
than the I2C designware.

Which hardware you are testing this patch on?
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