linux-kernel - Re: [RFC 1/5] of: Add support for ePAPR "stdout-path" property

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Date:	Fri, 28 Mar 2014 17:32:01 -0700
From:	Grant Likely <grant.likely@...aro.org>
To:	Rob Herring <robherring2@...il.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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>,
	Olof Johansson <olof@...om.net>,
	Rob Herring <rob.herring@...aro.org>
Subject: Re: [RFC 1/5] of: Add support for ePAPR "stdout-path" property

On Fri, 28 Mar 2014 16:56:28 -0500, Rob Herring <robherring2@...il.com> wrote:
> On Fri, Mar 28, 2014 at 4:33 PM, Benjamin Herrenschmidt
> <benh@...nel.crashing.org> wrote:
> > On Fri, 2014-03-28 at 09:08 -0700, Grant Likely wrote:
> >> ePAPR 1.1 defines the "stdout-path" property for specifying the console
> >> device, but Linux currently only handles the older "linux,stdout-path"
> >> property. This patch adds parsing for the new property name.
> >
> > Generally a good idea I think, but of course I need time to review and
> > test ... :-)
> >
> > One thing that's been annoying me lately with the existing code which
> > you don't address is ... in a few cases my consoles are usable *VERY*
> > early. For example PAPR hvc and OPAL hvc can be used before we even turn
> > the MMU on on powerpc (and thus before we unflatten the device-tree).
> >
> > It would be nice to be able to have the console going that early,
> > unfortunately that would imply using the flat device-tree for the
> > parsing / matching of the stdout-path in those drivers.
> 
> I'm working on getting just that working. See my series for "generic
> earlycon". I'm working on cleaning up the FDT part still, but have
> something functional. The "hardest" part with FDT is doing the address
> translation for serial devices, but I just stole that from u-boot.

:-) There have been several use-cases wanting to property parse reg
properties from the flat tree recently. It would be good to get that as
a generic helper.

g.

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