linux-kernel - Re: [PATCH 1/4] clocksource: pass DT node pointer to init functions

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Date:	Wed, 13 Feb 2013 18:33:39 +0100
From:	Michal Simek <monstr@...str.eu>
To:	Rob Herring <robherring2@...il.com>
Cc:	arm@...nel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Warren <swarren@...dotorg.org>,
	John Stultz <johnstul@...ibm.com>
Subject: Re: [PATCH 1/4] clocksource: pass DT node pointer to init functions

2013/2/13 Rob Herring <robherring2@...il.com>:
> On 02/13/2013 10:21 AM, Michal Simek wrote:
>> 2013/2/7 Rob Herring <robherring2@...il.com>:
>>> From: Rob Herring <rob.herring@...xeda.com>
>>>
>>> In cases where we have multiple nodes of the same type, we may need the
>>> node pointer to know which node was matched. Passing the node pointer
>>> also keeps the init function from having to match the node a 2nd time.
>>>
>>> Signed-off-by: Rob Herring <rob.herring@...xeda.com>
>>> Cc: John Stultz <johnstul@...ibm.com>
>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>> ---
>>>  drivers/clocksource/clksrc-of.c |    4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> Tested-by: Michal Simek <michal.simek@...inx.com>
>>
>> The rest is just the same as I have done. Any option to add these
>> patches to v3.9?
>
> I would like to before we have more users to fix, but it will have to be
> post rc1. If not, Arnd/Olof should be be able to provide a stable branch
> for 3.10.

ok

>> Because I need these patches for zynq timer because we have two in the soc.
>> Is it OK to register several clock source and clockevent devices?
>
> If it is 1 DT node, then that should be fine.

zynq is using two triple timer counter IP . There are also described by two
different DT nodes because there are separated and uses different baseaddresses.

Does it mean that if there are 2 DT nodes that it won't work?


One more thing. Is there any rule which should describe which timer should be
used for clockevent and for clocksource?


>> btw: there is still one issue because you can just setup only one
>> compatibility string.
>
> You can have multiple CLOCKSOURCE_OF_DECLARE statements. The gic code
> does this for irqchips.

Ok. Will look at it.

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform
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