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

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Date:	Fri, 28 Mar 2014 16:53:15 -0700
From:	Grant Likely <grant.likely@...aro.org>
To:	Rob Herring <robherring2@...il.com>,
	Olof Johansson <olof@...om.net>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rob Herring <rob.herring@...aro.org>
Subject: Re: [RFC 0/5] of: Automatic console registration cleanups

On Fri, 28 Mar 2014 14:19:23 -0500, Rob Herring <robherring2@...il.com> wrote:
> On Fri, Mar 28, 2014 at 1:56 PM, Olof Johansson <olof@...om.net> 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.
> >>
> >> 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.
> 
> I'm working on the early aspect. I've got things working with either
> command line (which I sent out recently) and with parsing the FDT
> (which I haven't sent out yet).

Oooh, I missed that. I'll take a look through the series and comment.

g.
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