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

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Date:	Sat, 18 Apr 2015 18:31:49 +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 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 :(

Alban
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