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

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Message-ID: <20140401061216.GQ17250@pengutronix.de>
Date:	Tue, 1 Apr 2014 08:12:16 +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 Mon, Mar 31, 2014 at 10:41:24AM +0100, Grant Likely wrote:
> On Mon, 31 Mar 2014 09:10:15 +0200, Sascha Hauer <s.hauer@...gutronix.de> wrote:
> > 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>
> 
> Brilliant! Thanks Sascha.
> 
> Can you supply a patch to add stdout to the imx dts files?

The information which console is used on each board is not in the
kernel. I can create a patch adding stdout for a handful of boards I
know, but I won't catch all.

Sascha

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