linux-kernel - Re: [PATCH 07/27] irqchip: Declare cortex-a7's irqchip to initialize gic from dt

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Message-ID: <87vbuh1my8.fsf@approximate.cambridge.arm.com>
Date:	Thu, 10 Apr 2014 11:46:39 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Chanho Park <chanho61.park@...sung.com>
Cc:	'Chanwoo Choi' <cw00.choi@...sung.com>,
	Mark Rutland <Mark.Rutland@....com>,
	"linux-samsung-soc\@vger.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"t.figa\@samsung.com" <t.figa@...sung.com>,
	"hyunhee.kim\@samsung.com" <hyunhee.kim@...sung.com>,
	"sw0312.kim\@samsung.com" <sw0312.kim@...sung.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	"yj44.cho\@samsung.com" <yj44.cho@...sung.com>,
	"inki.dae\@samsung.com" <inki.dae@...sung.com>,
	"kyungmin.park\@samsung.com" <kyungmin.park@...sung.com>,
	"kgene.kim\@samsung.com" <kgene.kim@...sung.com>,
	'Thomas Gleixner' <tglx@...utronix.de>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 07/27] irqchip: Declare cortex-a7's irqchip to initialize gic from dt

On Thu, Apr 10 2014 at 11:37:12 am BST, Chanho Park <chanho61.park@...sung.com> wrote:
> Hi,
>
>> -----Original Message-----
>> From: linux-arm-kernel [mailto:linux-arm-kernel-
>> bounces@...ts.infradead.org] On Behalf Of Marc Zyngier
>> Sent: Thursday, April 10, 2014 7:05 PM
>> To: Chanwoo Choi
>> Cc: mark.rutland@....com; linux-samsung-soc@...r.kernel.org;
>> t.figa@...sung.com; hyunhee.kim@...sung.com; sw0312.kim@...sung.com;
>> linux-kernel@...r.kernel.org; yj44.cho@...sung.com; inki.dae@...sung.com;
>> kyungmin.park@...sung.com; kgene.kim@...sung.com; Thomas Gleixner;
>> linux-arm-kernel@...ts.infradead.org
>> Subject: Re: [PATCH 07/27] irqchip: Declare cortex-a7's irqchip to
>> initialize gic from dt
>> 
>> On Thu, Apr 10 2014 at 10:28:24 am BST, Chanwoo Choi
>> <cw00.choi@...sung.com> wrote:
>> > This patch declare coretex-a7's irqchip to initialze gic from dt
>> > with "arm,cortex-a7-gic" data.
>> >
>> > Cc: Thomas Gleixner <tglx@...utronix.de>
>> > Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> > Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
>> > ---
>> >  drivers/irqchip/irq-gic.c | 1 +
>> >  1 file changed, 1 insertion(+)
>> >
>> > diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
>> > index 4300b66..8e906e4 100644
>> > --- a/drivers/irqchip/irq-gic.c
>> > +++ b/drivers/irqchip/irq-gic.c
>> > @@ -1069,6 +1069,7 @@ gic_of_init(struct device_node *node, struct
>> device_node *parent)
>> >  }
>> >  IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
>> >  IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
>> > +IRQCHIP_DECLARE(cortex_a7_gic, "arm,cortex-a7-gic", gic_of_init);
>> >  IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
>> >  IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
>> 
>> Frankly, this patch adds no value. Are we going to add
>> "arm,cortex-a12-gic", "arm,cortex-a17-gic", "arm,cortex-a53-gic",
>> "arm,cortex-a57-gic"? And that's just to mention the ARM Ltd cores...
>> 
>> Instead, how about defining a generic "arm,gic" property, and mandate
>> that new DT files are using that? We can always use a more precise
>> compatible for quirks.
>
> I prefer it would be arm,gicv2 instead arm-gic.

If you prefer, fine by me. Consider spelling it "arm,gic-v2", which
seems to be the current convention for version numbers.

> In case of GICv3 of arm64, it can be arm,gicv3.

GICv3 and arm64 are independent of each other, and the binding has
already been specified as "arm,gic-v3".

	M.
-- 
Jazz is not dead. It just smells funny.
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