linux-kernel - Re: [PATCH 1/3] of: Allow OF to be enabled if COMPILE

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Date:	Thu, 23 Apr 2015 15:03:28 +0300
From:	Pantelis Antoniou <pantelis.antoniou@...sulko.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] of: Allow OF to be enabled if COMPILE_TEST to increase coverage

Hi Rob,

> On Apr 6, 2015, at 16:13 , Rob Herring <robherring2@...il.com> wrote:
> 
> +Pantelis
> 
> On Sun, Apr 5, 2015 at 9:59 AM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>> Currently the OF configuration symbol is explicitly selected on
>> architectures that support device trees and/or Open Firmware.
>> However, there's no technical reason to limit the device tree
>> infrastructure to these architectures. Hence allow OF to be enabled when
>> compile testing, to increase compile coverage.
>> 
>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>> ---
>> drivers/of/Kconfig | 6 +++++-
>> 1 file changed, 5 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
>> index 7bcaeec876c0c3a5..4c98f14694458794 100644
>> --- a/drivers/of/Kconfig
>> +++ b/drivers/of/Kconfig
>> @@ -2,7 +2,11 @@ config DTC
>>        bool
>> 
>> config OF
>> -       bool
>> +       bool "Device Tree and Open Firmware support" if COMPILE_TEST
> 
> Actually, I think we want to just make this always visible. There are
> now use cases with overlays where we may want to enable DT even if the
> architecture is not booting with DT. However, there may be more work
> needed to do that.
> 

We have to decouple the notion of CONFIG_OF of the following two different things.

1. I’m booting using a device tree blob.
2. I’m using the in-kernel live device tree to represent my hardware device state.

so CONFIG_OF_DTB_BLOB for the first case, and CONFIG_OF for the second.

Up to now we bundle those two together.

> Rob
> 

Regards

— Pantelis

>> +       help
>> +         This option enables the device tree infrastructure.
>> +         If is automatically selected by platforms that need it, but can
>> +         be enabled manually to increase compile-coverage.
>> 
>> menu "Device Tree and Open Firmware support"
>>        depends on OF
>> --
>> 1.9.1
>> 
>> --
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