linux-kernel - Re: [PATCH 2/8] ARM: zynq: move ttc timer code to drivers/clocksource

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Message-ID: <5097D1E8.2000403@gmail.com>
Date:	Mon, 05 Nov 2012 08:49:12 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Michal Simek <michal.simek@...inx.com>
CC:	Josh Cartwright <josh.cartwright@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Russell King <linux@....linux.org.uk>,
	Mike Turquette <mturquette@...com>,
	John Stultz <johnstul@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Linn <John.Linn@...inx.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH 2/8] ARM: zynq: move ttc timer code to drivers/clocksource



On 11/05/2012 05:22 AM, Michal Simek wrote:
> 2012/10/29 Josh Cartwright <josh.cartwright@...com>:
>> Suggested cleanup by Arnd Bergmann.  Move the ttc timer.c code to
>> drivers/clocksource, and out of the mach-zynq directory.
>>
>> The common.h (which only held the timer declaration) was renamed to
>> xilinx_ttc.h and moved into include/linux.
>>
>> Signed-off-by: Josh Cartwright <josh.cartwright@...com>
>> Cc: Arnd Bergmann <arnd@...db.de>
>> ---
>>  arch/arm/mach-zynq/Makefile                                    | 2 +-
>>  arch/arm/mach-zynq/common.c                                    | 2 +-
>>  drivers/clocksource/Makefile                                   | 1 +
>>  arch/arm/mach-zynq/timer.c => drivers/clocksource/xilinx_ttc.c | 1 -
>>  arch/arm/mach-zynq/common.h => include/linux/xilinx_ttc.h      | 4 ++--
>>  5 files changed, 5 insertions(+), 5 deletions(-)
>>  rename arch/arm/mach-zynq/timer.c => drivers/clocksource/xilinx_ttc.c (99%)
>>  rename arch/arm/mach-zynq/common.h => include/linux/xilinx_ttc.h (91%)
> 
> Not going to apply this patch till there is clean way how to move all
> drivers there.
> Especially I don't like to add xilinx_ttc.h to include/linux folder.
> 

A cleaner way is how we are doing irqchips [1]. This needs a single
function (or one each for clksrc and clkevt) that has a DT match list of
all known timers and calls their init function. It should be a bit
simpler than irqchips init function because you don't need to worry
about hierarchy init ordering. That doesn't solve non-DT though and if
there are any extra functions like we have with irqchips, you still need
the header in include/linux.

Rob

[1] http://www.spinics.net/lists/arm-kernel/msg203687.html
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