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From: robherring2@gmail.com (Rob Herring)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 03/11] clocksource: sp804: add device tree support
Date: Wed, 13 Mar 2013 10:39:41 -0500
Message-ID: <51409DBD.5080209@gmail.com> (raw)
In-Reply-To: <1363188595.3100.101.camel@hornet>

On 03/13/2013 10:29 AM, Pawel Moll wrote:
> On Wed, 2013-03-13 at 15:25 +0000, Haojian Zhuang wrote:
>> On 13 March 2013 23:23, Pawel Moll <pawel.moll@arm.com> wrote:
>>> On Wed, 2013-03-13 at 14:17 +0000, Rob Herring wrote:
>>>> How about:
>>>>
>>>> 1 irq - TIMINT1
>>>> 2 irqs w/ same source # - TIMINTC
>>>> 2 irqs w/ different source # - TIMINT1 and TIMINT2
>>>
>>> On Wed, 2013-03-13 at 15:11 +0000, Haojian Zhuang wrote:
>>>> What's the scenario that we must use TIMINTC? TIMINT1 & TIMINT2 are
>>>> already enough on these two TIMERs. If we really needn't TIMINTC, we
>>>> need to support it. Since it's over-designed.
>>>>
>>>> If TIMINT1 & TIMINT2 aren't routed, and only TIMINTC is routed. It's another
>>>> case. We can consider it as replacement of TIMINT1.
>>>
>>> Just a thought... How to describe a SP804 with only TIMINT2 wired up?
>>>
>>> Pawe?
>>>
>>>
>> There's no difference on TIMINTC is only used to replace TIMINT1 or TIMINT2.
>> We only need to tell sp804 driver which timer is using irq, and the irq number.
> 
> If I understand you well:
> 
> * Both TIMINT1 and TIMINT2 wired up - TIMINTC doesn't matter
> 
> 	interrupts = <1>, <2>;
> 
> * TIMINT1 wired up, TIMINT2 not wired up
> 
> 	interrupts = <1>;
> 
> * Only TIMINTC wired up - treat it as TIMINT1
> 
> 	interrupts = <1>;
> 
> So far so good. My question is, how do you describe the following:
> 
> * _Only_ TIMINT2 wired up, TIMINT1 and TIMINTC _not_ wired up
> 
> 	interrupts = ???

I previously described that to add a property in that case. That makes
INT1 and INT2 only handling asymetric though. An alternative would be an
optional property "arm,sp804-has-irq = <#>" in the case of only INT1 or
INT2 connected. The combined irq would be a single irq without the
"arm,sp804-has-irq" property and both connected would be 2 irqs.

Rob

  reply index

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-13  5:05 [PATCH v3 00/11] add hisilicon SoC support Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 01/11] clocksource: move sp timer driver Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 02/11] clocksource: select USE_OF by default Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 03/11] clocksource: sp804: add device tree support Haojian Zhuang
2013-03-13 11:05   ` Pawel Moll
2013-03-13 11:37     ` Haojian Zhuang
2013-03-13 11:41       ` Pawel Moll
2013-03-13 14:17     ` Rob Herring
2013-03-13 14:42       ` Pawel Moll
2013-03-13 14:51         ` Rob Herring
2013-03-13 14:55           ` Pawel Moll
2013-03-13 15:11             ` Haojian Zhuang
2013-03-13 15:23               ` Pawel Moll
2013-03-13 15:25                 ` Haojian Zhuang
2013-03-13 15:29                   ` Pawel Moll
2013-03-13 15:39                     ` Rob Herring [this message]
2013-03-13 15:41                       ` Pawel Moll
2013-03-13 15:44                         ` Haojian Zhuang
2013-03-13 15:42                     ` Haojian Zhuang
2013-03-13 15:49                       ` Pawel Moll
2013-03-13 16:35                         ` Arnd Bergmann
2013-03-13 16:41                           ` Pawel Moll
2013-03-15 12:20       ` Russell King - ARM Linux
2013-03-13  5:05 ` [PATCH v3 04/11] ARM: integrator: use clocksource_of_init for sp804 Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 05/11] ARM: highbank: " Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 06/11] ARM: vexpress: " Haojian Zhuang
2013-03-13 11:10   ` Pawel Moll
2013-03-13 11:42     ` Haojian Zhuang
2013-03-13 11:46       ` Pawel Moll
2013-03-13 12:21         ` Haojian Zhuang
2013-03-13 14:48           ` Pawel Moll
2013-03-13 15:01             ` Haojian Zhuang
2013-03-13 15:19               ` Pawel Moll
2013-03-13 15:59                 ` Haojian Zhuang
2013-03-13 16:28                   ` Pawel Moll
2013-03-13 16:32                   ` Rob Herring
2013-03-15 12:34                     ` Russell King - ARM Linux
2013-03-15 12:58                       ` Pawel Moll
2013-03-15 18:10                         ` Russell King - ARM Linux
2013-03-13  5:05 ` [PATCH v3 07/11] ARM: debug: support debug ll on hisilicon soc Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 08/11] clk: hi3xxx: add clock support Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 09/11] ARM: hi3xxx: add board support with device tree Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 10/11] ARM: hi3xxx: enable hi4511 " Haojian Zhuang
2013-03-13  5:05 ` [PATCH v3 11/11] ARM: config: append arch hi3xxx into multi defconfig Haojian Zhuang

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