linux-kernel - Re: [PATCH v4 2/8] OF: Introduce DT overlay support.

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Date:	Wed, 14 May 2014 06:18:58 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grant Likely <grant.likely@...retlab.ca>
CC:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Pete Popov <pete.popov@...sulko.com>,
	Dan Malek <dan.malek@...sulko.com>,
	Georgi Vlaev <georgi.vlaev@...sulko.com>,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: Re: [PATCH v4 2/8] OF: Introduce DT overlay support.

On 05/14/2014 06:03 AM, Geert Uytterhoeven wrote:
> On Wed, May 14, 2014 at 12:08 PM, Grant Likely
> <grant.likely@...retlab.ca> wrote:
>>> +config OF_OVERLAY
>>> +     bool "OF overlay support"
>>> +     depends on OF
>>> +     select OF_DYNAMIC
>>> +     select OF_DEVICE
>>> +     select OF_RESOLVE
>>> +     help
>>> +       OpenFirmware overlay support. Allows you to modify on runtime the
>>> +       live tree using overlays.
>>
>> Should not be a user-visable option. Drivers using it should select it
>
> Why not? It's up to the (final) user to use it, or not.
>
>> or otherwise cause it to be enabled.
>
> Why should this be driver-specific? Shouldn't this just work with all drivers?
>

It does once enabled.

I think what Grant refers to is that there has to be a driver which implements
the actual overlay insertion and removal (ie calls the new API functions),
and that the Kconfig option for this driver should select OF_OVERLAY
instead of depending on it.

Guenter

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