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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Apr 10 2014 at 11:30:41 am BST, armdev <armdev.ftm@xxxxxxxxx> wrote:
> On 10-Apr-2014, at 3:51 pm, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
>
>> On Thu, Apr 10 2014 at 11:09:02 am BST, armdev <armdev.ftm@xxxxxxxxx> wrote:
>>> On 10-Apr-2014, at 3:34 pm, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
>>> 
>>>> On Thu, Apr 10 2014 at 10:28:24 am BST, Chanwoo Choi <cw00.choi@xxxxxxxxxxx> wrote:
>>>>> This patch declare coretex-a7's irqchip to initialze gic from dt
>>>>> with "arm,cortex-a7-gic" data.
>>>>> 
>>>>> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
>>>>> Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
>>>>> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
>>>>> ---
>>>>> 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.

Not exactly. We just happen to support two revisions of the GIC
architecture with the same binding. GICv3 has an entierely separate
binding.

> gicv1 - 2 address sets (gicc and gicd)

Yes.

> gicv2 - 4 sets (gicc gicd gicv gich) and 1 maintenance interrupt. Right?

No.

The presence of the GICV, GICH and maintenance interrupt are indicative
of the support for the Virtualization Extentions. GICv2 itself can
perfectly be built without it.

	M.
-- 
Jazz is not dead. It just smells funny.
--
To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux SoC Development]     [Linux Rockchip Development]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Linux SCSI]     [Yosemite News]

  Powered by Linux