linux-kernel - Re: [PATCH] net: can: Enable xilinx driver for all ARCHs

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Message-ID: <BY2FFO11FD023D29C02DAF9CCBDC40386E21B0@BY2FFO11FD023.protection.gbl>
Date:	Mon, 9 Mar 2015 15:04:28 +0100
From:	Michal Simek <michal.simek@...inx.com>
To:	Marc Kleine-Budde <mkl@...gutronix.de>,
	Jean Delvare <jdelvare@...e.de>
CC:	Michal Simek <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>, <monstr@...str.eu>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	<linux-can@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: can: Enable xilinx driver for all ARCHs

On 03/09/2015 02:55 PM, Marc Kleine-Budde wrote:
> On 03/09/2015 02:53 PM, Jean Delvare wrote:
>> Le Monday 09 March 2015 à 10:56 +0100, Marc Kleine-Budde a écrit :
>>> On 03/09/2015 10:52 AM, Michal Simek wrote:
>>>> On 03/09/2015 10:13 AM, Marc Kleine-Budde wrote:
>>>>> On 03/09/2015 09:58 AM, Michal Simek wrote:
>>>>>> On 03/09/2015 09:50 AM, Marc Kleine-Budde wrote:
>>>>>>> On 03/09/2015 09:48 AM, Michal Simek wrote:
>>>>>>>> Remove Kconfig dependency and enable driver for
>>>>>>>> all ARCHs.
>>>>>>>>
>>>>>>>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>>>>>>>> Acked-by: Sören Brinkmann <soren.brinkmann@...inx.com>
>>>>>>>> ---
>>>>>>>>
>>>>>>>> Test for all archs done by Kbuild test robot without any problem.
>>>>>>>> ---
>>>>>>>>  drivers/net/can/Kconfig | 1 -
>>>>>>>>  1 file changed, 1 deletion(-)
>>>>>>>>
>>>>>>>> diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
>>>>>>>> index 98d73aab52fe..f690c3fb3088 100644
>>>>>>>> --- a/drivers/net/can/Kconfig
>>>>>>>> +++ b/drivers/net/can/Kconfig
>>>>>>>> @@ -131,7 +131,6 @@ config CAN_RCAR
>>>>>>>>  
>>>>>>>>  config CAN_XILINXCAN
>>>>>>>>  	tristate "Xilinx CAN"
>>>>>>>> -	depends on ARCH_ZYNQ || MICROBLAZE || COMPILE_TEST
>>>>>>>
>>>>>>> I think that's what COMPILE_TEST ist for?
>>>>>>
>>>>>> For compilation yes but not for enabling. Currently this driver
>>>>>> can be also used on ARM64 that's why people suggesting directly
>>>>>> to remove dependency on arch and then COMPILE_TEST can be removed
>>>>>> too.
>>>>>
>>>>> In the past (May 2014) I had people complaining that certain ARM SoC
>>>>> specific drivers are enabled on ARM in general, not just on that SoC. As
>>>>> I'm not following arm64 in detail, has the notion of using depends on
>>>>> ARCH changes since then?
>>>>>
>>>>>> Or do you want me to change description to mention that this is for
>>>>>> ARM64 enabling?
>>>>>
>>>>> Given this is consensus, a remark to ARM64 would be appreciated. :)
>>>>
>>>> David has applied this patch which is in general just the same as this one.
>>>>
>>>> (linux-next) Remove architecture dependency
>>>> 28811a8c00fe0d899b8a544421f3b4947425d5e8
>>>>
>>>> Mark Brown has suggested to do so for spi and don't check architecture at
>>>> all.
>>>> I have also sent similar patch for watchdog driver too.
>>>>
>>>> I think it is up to you if you want to add ARM64 to Kconfig or just remove
>>>> that arch dependencies.
>>>> To be honest my goal is to enable this driver for ARM64.
>>>> Please tell me what way you prefer.
>>>
>>> I like the idea of removing the depends on ARCH completely. Jean, what
>>> do you think?
>>
>> Removing the dependency completely will let the option be displayed on
>> systems where the driver is useless. I am in favor of having hardware
>> dependencies on as many drivers as possible to avoid bothering the user
>> with irrelevant questions. The list of Kconfig entries has grown a lot
>> over time!
>>
>> If the current dependency is too strict then I would suggest to extend
>> it or to make it broader (depends on ARM || ARM64 || COMPILE_TEST would
>> be acceptable IMHO.) Dropping it completely only makes sense if the part
>> is used on so many systems that the dependency becomes too long or is a
>> pain to maintain.
> 
> Sounds reasonable. Michael, make it so.

I have sent v2 which add arm64 to Kconfig and I am keeping just dependency on
ARCH_ZYNQ not all ARM platforms.

Thanks,
Michal




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