linux-kernel - Re: [RFC 0/5] of: Automatic console registration cleanups

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Date:	Fri, 28 Mar 2014 11:56:53 -0700
From:	Olof Johansson <olof@...om.net>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	devicetree@...r.kernel.org, christoffer.dall@...aro.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	rob.herring@...aro.org
Subject: Re: [RFC 0/5] of: Automatic console registration cleanups

On Fri, Mar 28, 2014 at 09:08:00AM -0700, Grant Likely wrote:
> Hi all,
> 
> This is a series that I've been playing with over the last few days to
> clean up the selection of default console devices when using the device
> tree. The device tree defines a way of specifying the console by using a
> "stdout-path" property in the /chosen node, but very few drivers
> actually attempt to use that data, and so for most platforms there needs
> to be a "console=" line in the command line if a serial port is intended
> to be used as the console.
> 
> With this series, if there is a /chosen/stdout-path property, and if
> that property points to a serial port node, then when the serial driver
> registers the port, the core uart_add_one_port() function will notice
> and if no console= argument was provided then add it as a preferred
> console.
> 
> I've not tested this very extensively yet, but I want to get some
> feedback before I go further.
> 
> The one downside with this approach is that it doesn't do anything for
> early console setup. That still needs to be added on a per-driver basis,
> but at least it shouldn't conflict with this approach.

Looks sane to me (as discussed in person). I gave it a run on PWRficient with
and without console= line (8250-based uart), and it behaved as expected.

A couple of nits on the series, replied to two of the patches.

I'll give it a run through the board farm here too, but I'll keep console=
bootargs there for those boots at this time, too much to change to take it out
everywhere. :-)


-Olof
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