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

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Date:	Mon, 20 Apr 2015 11:50:56 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Alban <albeu@...e.fr>
Cc:	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 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.

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

Thanks,


Paul Bolle

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