netdev - Re: [PATCH net-next 4/4] igb: enable auxiliary PHC functions for the i210.

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Message-ID: <1369859530.1971.29.camel@bwh-desktop.uk.level5networks.com>
Date:	Wed, 29 May 2013 21:32:10 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Richard Cochran <richardcochran@...il.com>
CC:	"Keller, Jacob E" <jacob.e.keller@...el.com>,
	"Vick, Matthew" <matthew.vick@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: Re: [PATCH net-next 4/4] igb: enable auxiliary PHC functions for
 the i210.

On Wed, 2013-05-29 at 09:24 +0200, Richard Cochran wrote:
> On Tue, May 28, 2013 at 09:12:02PM +0000, Keller, Jacob E wrote:
> > 
> > I think ethtool would be good, but what about using sysfs?
> 
> The problem I see with ethtool is that configuring GPIOs (and these
> SDPs are really just GPIOs by a different name) is really the job of
> the device tree. But of course, most x86 users of the i210 don't have
> this option.
> 
> Also, using ethtool or sysfs is not really attractive for embedded
> designs (let's not forget the poor embedded guys). I think we need to
> have a way to specify the pin functions at (or before) kernel boot
> time.  Barring DT and kconfig, using a module parameter is the only
> way to accomplish this.

On x86 the correct place to put this information would presumably be an
ACPI table.  And if the BIOS doesn't provide it, there is
CONFIG_ACPI_CUSTOM_DSDT, though that may be a bit of a sledgehammer...

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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