linux-kernel - Re: [PATCH v2] ARM: dts: am335x-bone-common: Add i2c2 definition

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Message-ID: <537215D3.70306@ti.com>
Date:	Tue, 13 May 2014 08:53:39 -0400
From:	Tom Rini <trini@...com>
To:	Robert Nelson <robertcnelson@...il.com>,
	Tony Lindgren <tony@...mide.com>
CC:	Matt Ranostay <mranostay@...il.com>, <robh+dt@...nel.org>,
	<mark.rutland@....com>, Russell King <linux@....linux.org.uk>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Pantelis Antoniou <pantelis.antoniou@...il.com>,
	Matt Porter <matt.porter@...aro.org>
Subject: Re: [PATCH v2] ARM: dts: am335x-bone-common: Add i2c2 definition

On 05/12/2014 04:57 PM, Robert Nelson wrote:
>>> Either case if fine with me.  As who knows when the dtc "overlay" will
>>> every truly make it mainline, as the capemgr was the only real kernel
>>> user of the i2c/at24 eeprom information.
>>
>> Sounds like we should keep it disabled though so u-boot can be used
>> to toggle it while waiting for the capemgr. That's because the board
>> has a header for pins, so it's not exactly limited to just the capes.
>>
>> Anybody working on enabling/disabling cape dtb configurations in u-boot?
> 
> Well,
> 
> Would Tom even approve of that in mainline u-boot? He didn't want my
> "invert" the gpio to enable the usb hub on the older beagle xm A/B..
> 
> http://lists.denx.de/pipermail/u-boot/2014-January/172154.html
> 
> http://lists.denx.de/pipermail/u-boot/2014-January/172274.html

I would think that using the 'fdt' command in U-Boot to add all
properties of every cape found on a running system would drive someone
to madness quite quickly.  Moving all of Pantelis' work for dynamic
device trees from the kernel to N bootloaders (U-Boot, barebox, UEFI,
etc) sounds like a step in the wrong direction.

-- 
Tom
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