linux-kernel - Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

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Date:	Tue, 20 Nov 2012 16:51:56 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	kernel@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

On Mon, 19 Nov 2012 10:52:02 +0100, Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com> wrote:
> On 10:31 Thu 15 Nov     , Sascha Hauer wrote:
> > devicetrees may have a linux,stdout-path property in the chosen
> > node describing the console device. This adds a helper function
> > to match a device against this property so a driver can call
> > add_preferred_console for a matching device.
> 
> I like it but I've an issue with it I cannot specify the option for
> 
> as example I need to set the uart at 38400n8 or 115200n8 regarless of wath the
> booloader did

Right. stdout-path can have a set of arguments appended for things like
serial speed.  ePAPR says this about stdout-path:

A string that specifies the full path to the node representing the
device to be used for boot console output. If the character ":" is
present in the value it terminates the path. The value may be an alias.

If the stdin-path property is not specified, stdout-path should be
assumed to define the input device.

So, this function needs to do three more things:
- also look for 'stdout-path' (in addition to 'linux,stdout-path')
- Parse for a ':' in the path and trim that off so it can be used for
  arguments. (Bonus: return the arguments to the caller)
- make sure that it can handle the path containing an alias (I've just
  not checked if the current code will handle this)

g.

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