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

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Message-ID: <20140331071014.GN17250@pengutronix.de>
Date:	Mon, 31 Mar 2014 09:10:15 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	devicetree@...r.kernel.org, christoffer.dall@...aro.org,
	linux-kernel@...r.kernel.org, olof@...om.net,
	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.

I gave it a test on i.MX. It works as expected with both
linux,stdout-path and stdout-path. Specifying a console on the
commandline still works and overrides the devicetree setting.

Tested-by: Sascha Hauer <s.hauer@...gutronix.de>

Sascha

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