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

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Date:	Thu, 30 Apr 2015 15:19:01 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Rob Herring <robh@...nel.org>
CC:	Sudeep Holla <sudeep.holla@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>
Subject: Re: [PATCH 1/2] ARM: simplify timer initialisation and remove arm_timer.h
 inclusion



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.
>

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.

Regards,
Sudeep
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