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

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Date:	Thu, 23 Apr 2015 21:28:46 +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 23, 2015, at 21:22 , Rob Herring <robherring2@...il.com> wrote:
> 
> 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
> 

A bit cryptically named, no?

> Rob

Regards

— Pantelis

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