From mboxrd@z Thu Jan 1 00:00:00 1970 From: pawel.moll@arm.com (Pawel Moll) Date: Wed, 13 Mar 2013 15:29:55 +0000 Subject: [PATCH v3 03/11] clocksource: sp804: add device tree support In-Reply-To: References: <1363151142-32162-1-git-send-email-haojian.zhuang@linaro.org> <1363151142-32162-4-git-send-email-haojian.zhuang@linaro.org> <1363172730.3100.17.camel@hornet> <51408A71.9090501@gmail.com> <1363185757.3100.66.camel@hornet> <51409276.8050601@gmail.com> <1363186548.3100.75.camel@hornet> <1363188238.3100.95.camel@hornet> Message-ID: <1363188595.3100.101.camel@hornet> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, 2013-03-13 at 15:25 +0000, Haojian Zhuang wrote: > On 13 March 2013 23:23, Pawel Moll 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?