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

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Date:	Thu, 23 Apr 2015 13:22:25 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Pantelis Antoniou <pantelis.antoniou@...sulko.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

On Thu, Apr 23, 2015 at 7:03 AM, Pantelis Antoniou
<pantelis.antoniou@...sulko.com> wrote:
> 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.

They are separate already with CONFIG_OF_EARLY_FLATTREE

Rob
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