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

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Message-Id: <254FD85F-0C8E-4D16-8207-5BA4E7FBDE65@gmail.com>
Date:	Thu, 10 Apr 2014 16:00:41 +0530
From:	armdev <armdev.ftm@...il.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>,
	"kgene.kim@...sung.com" <kgene.kim@...sung.com>,
	"t.figa@...sung.com" <t.figa@...sung.com>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"hyunhee.kim@...sung.com" <hyunhee.kim@...sung.com>,
	"sw0312.kim@...sung.com" <sw0312.kim@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yj44.cho@...sung.com" <yj44.cho@...sung.com>,
	"inki.dae@...sung.com" <inki.dae@...sung.com>,
	"kyungmin.park@...sung.com" <kyungmin.park@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mark Rutland <Mark.Rutland@....com>
Subject: Re: [PATCH 07/27] irqchip: Declare cortex-a7's irqchip to initialize gic from dt


On 10-Apr-2014, at 3:51 pm, Marc Zyngier <marc.zyngier@....com> wrote:

> On Thu, Apr 10 2014 at 11:09:02 am BST, armdev <armdev.ftm@...il.com> wrote:
>> On 10-Apr-2014, at 3:34 pm, Marc Zyngier <marc.zyngier@....com> wrote:
>> 
>>> 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.
>>> 
>> 
>> How about keeping it simple and tied to arm gic versions
>> arm,gicv1, arm,gicv2, arm,gicv2ve
> 
> That's a variation on the same theme. As for GICv2, we don't need to
> distinguish between having the Virtualization Extentions, the binding
> already allows you to tell one from the other.
> 
So if there be just 2 types of gic, it would be simple.
gicv1 - 2 address sets (gicc and gicd)
gicv2 - 4 sets (gicc gicd gicv gich) and 1 maintenance interrupt. Right?

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

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