linux-kernel - Re: [PATCH 02/14] MIPS: ath79: Add basic device tree support

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Message-ID: <20150424113940.132ac92c@tock>
Date:	Fri, 24 Apr 2015 11:39:40 +0200
From:	Alban <albeu@...e.fr>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Aban Bedel <albeu@...e.fr>, linux-mips@...ux-mips.org,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Qais Yousef <qais.yousef@...tec.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/14] MIPS: ath79: Add basic device tree support

On Mon, 20 Apr 2015 11:50:56 +0200
Paul Bolle <pebolle@...cali.nl> wrote:

> On Sat, 2015-04-18 at 18:31 +0200, Alban wrote:
> > On Sat, 18 Apr 2015 09:05:52 +0200
> > Paul Bolle <pebolle@...cali.nl> wrote:
> > 
> > > On Fri, 2015-04-17 at 16:24 +0200, Alban Bedel wrote:
> > > 
> > > > --- a/arch/mips/ath79/Kconfig
> > > > +++ b/arch/mips/ath79/Kconfig
> > > >  
> > > > +choice
> > > > +	prompt "Builtin devicetree selection"
> > > > +	default DTB_ATH79_NONE
> > > > +	help
> > > > +	  Select the devicetree.
> > > > +
> > > > +	config DTB_ATH79_NONE
> > > > +		bool "None"
> > > > +endchoice
> > > 
> > > This adds a choice block with one config entry. So what this
> > > achieves is that DTB_ATH79_NONE will always be 'y', right?
> > > Besides I didn't notice on a user of CONFIG_DTB_ATH79_NONE. So as
> > > far as I can see this choice has no effect on the build.
> > > 
> > > Why was this choice entry added?
> > 
> > This menu is for boards that need a built-in DTB, as MIPS currently
> > doesn't support appended DTBs it is the only way to load a DTB on
> > boards stuck with a broken boot loader. But as no board has been
> > added yet it only contain the entry for boards that don't need a
> > built-in DTB, which do nothing as you pointed out.
> > 
> > A board is then added in this menu in patch 14, for some reasons git
> > send-email didn't send the whole serie at once :(
> 
> I saw 14/14 fly by now. (And I saw 12/12 of v2, which basically
> replaces 14/14.) That makes things clear.
> 
> Perhaps, if you're going to send a v3, you might move this change into
> 12/12. At least, I see little reason to add this choice block in two
> separate steps in this series.

Ok, I'll do that.

> (Side note: you _might_ be able to drop config DTB_ATH79_NONE entirely
> if you also replace
> 	default DTB_ATH79_NONE
> 
> with
> 	optional
> 
> optional is a little used option for choice blocks. I haven't tested
> this, so this suggestion could end up wasting your time. And even then
> this all looks like a complicated way to set just DTB_TL_WR1043ND_V1.

I'll try that.

> I suppose you expect to add things to this choice block in the
> future.)

This is the only ATH79 board I currently have access to. However
openwrt has patches to add support for quiet a few, so I hope more
boards will be submitted once we have DT support in. Most of these
boards are appliance stuck with old bootloaders, so they will need this
too. 

Alban
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