linux-kernel - Re: [PATCH 1/2] ARM: simplify timer initialisation and remove arm

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Message-ID: <20150518103302.GB21251@e104818-lin.cambridge.arm.com>
Date:	Mon, 18 May 2015 11:33:02 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Olof Johansson <olof@...om.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] ARM: simplify timer initialisation and remove
 arm_timer.h inclusion

On Fri, May 15, 2015 at 07:03:34PM +0100, Sudeep Holla wrote:
> On 30/04/15 15:19, Sudeep Holla wrote:
> >On 30/04/15 15:09, Rob Herring wrote:
> >>On Thu, Apr 30, 2015 at 5:44 AM, Sudeep Holla <sudeep.holla@....com> wrote:
> >>>The header asm/hardware/arm_timer.h is included in various machine
> >>>specific files to access TIMER_CTRL and initialise to a known state.
> >>>However that's not required as the clock{source,event} driver timer-sp
> >>>initialises all the timer being used.
> >>
> >>I believe the idea is not to initialize the timers being used, but the
> >>ones not being used and perhaps left running by the bootloader. Cases
> >>where the interrupt is shared could cause a problem.
> 
> Russell, can you confirm if that's the case ?

Unless you want to test all these platforms, I would suggest we assume
this is the case. The comments even state "Initialise to a known state
(all timers off)".

> >Ah OK, makes sense. I will wait for Russell to confirm. The main idea
> >was to keep the header file having offsets local to driver/clocksource
> >and avoid sharing it in include/linux but looks like that's not possible.
> 
> Since we need this driver on ARM64, we might have to end up sharing the
> header file with offsets if required for ARM platforms(though it would
> be good to avoid it if there's any better alternative solution than that)

Can you not just move the definitions to
include/clocksource/timer-sp804.h and add some SP804_ prefix to avoid
name collisions?

-- 
Catalin
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