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From: haojian.zhuang@linaro.org (Haojian Zhuang)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 03/11] clocksource: sp804: add device tree support
Date: Wed, 13 Mar 2013 23:42:08 +0800
Message-ID: <CAD6h2NQa-RhR555o_1_RYPuPb4366H_AwK1U9S3pRVPdo_xNNg@mail.gmail.com> (raw)
In-Reply-To: <1363188595.3100.101.camel@hornet>

On 13 March 2013 23:29, Pawel Moll <pawel.moll@arm.com> 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 = ???
>
> Pawe?
>
>
>
In my current implementation, I need two things to judge whether
irq is really necessary.

If the timer contains "arm,sp804-clockevent = <evtoffs>" property,
I'll check whether the timer irq is specified at the same time.

TIMINT1 & TIMINTC are not routed. TIMINT2 is used for clock event.

     interrupts = <any number> <1>;

        if (!retevt) {
                if (evtoffs) {
                        /* TIMER2 is clock event */
                        i = 1;
                        evtoffs = TIMER_2_BASE;
                } else {
                        /* TIMER1 is clock event */
                        i = 0;
                        evtoffs = TIMER_1_BASE;
                }
                irq = irq_of_parse_and_map(np, i);
                ...
        }

If the timer contains "arm,sp804-clocksource = <srcoffs>" property,
I won't check the timer irq. You even needn't define it.

TIMINT1 & TIMINTC are not routed. TIMER2 is used for clock source.
      interrupts = <any number> <any number>;
or
      don't define interrupts

        if (!retsrc) {
                if (srcoffs) {
                        /* TIMER2 is clock source */
                        i = 1;
                        srcoffs = TIMER_2_BASE;
                } else {
                        /* TIMER1 is clock source */
                        i = 0;
                        srcoffs = TIMER_1_BASE;
                }
                ...
        }

  parent 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
2013-03-13 15:41                       ` Pawel Moll
2013-03-13 15:44                         ` Haojian Zhuang
2013-03-13 15:42                     ` Haojian Zhuang [this message]
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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