linux-kernel - Re: Arndale Timer Interrupt Question

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Message-id: <52E26EBE.8080905@samsung.com>
Date:	Fri, 24 Jan 2014 14:46:38 +0100
From:	Tomasz Figa <t.figa@...sung.com>
To:	Mj Embd <mj.embd@...il.com>
Cc:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-samsung-soc@...r.kernel.org
Subject: Re: Arndale Timer Interrupt Question



On 23.01.2014 07:10, Mj Embd wrote:
> On 1/10/14, Tomasz Figa <t.figa@...sung.com> wrote:
>> Hi,
>>
>> On 09.01.2014 13:52, Bartlomiej Zolnierkiewicz wrote:
>>>
>>> added linux-samsung-soc to cc:,
>>> it is a better suited list for this question
>>>
>>> On Thursday, January 09, 2014 10:30:56 AM Mj Embd wrote:
>>>> I am a bit confused on the interrupt number for CNTVIRQ..CNTHPIRQ. Can
>>>> you please help here.
>>>>
>>>> As per the exynos5 public manual
>>>> What is the difference between  CPU_nCNTHPIRQ[0] and CNTHPIRQ.
>>
>> I'm not sure if this is really what I think it is, but looking at the
>> manual, CPU_nCNTHPIRQ[0] and [1] SPI ports and CNTHPIRQ PPI port seem to
>> be the same signals, with the difference that the first two are shared
>> interrupts connected through the combiner, while the last one is a
>> per-processor interrupt, directly connected to GIC PPI port, allowing
>> each CPU to get its own CNTHPIRQ signal ([0] for CPU 0 and [1] for CPU 1).
>
> So while registering the IRQ which one has to be used Core0:26/33 Core1:26/54 ?

Well, it depends on your driver. If it supports per-CPU interrupts then 
you use CNTHPIRQ PPI port, othwerise nCNTHPIRQ[0] and [1] SPI ports.

Best regards,
Tomasz
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