linux-kernel - Re: [PATCH v4 2/2] soc: Add driver for Freescale Vybrid Platform

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Message-ID: <5565FECE.3000104@suse.de>
Date:	Wed, 27 May 2015 19:28:46 +0200
From:	Andreas Färber <afaerber@...e.de>
To:	maitysanchayan@...il.com, Paul Bolle <pebolle@...cali.nl>
CC:	devicetree@...r.kernel.org, arnd@...db.de,
	linux-kernel@...r.kernel.org, stefan@...er.ch,
	kernel@...gutronix.de, shawn.guo@...aro.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 2/2] soc: Add driver for Freescale Vybrid Platform

Hi,

Am 27.05.2015 um 15:07 schrieb maitysanchayan@...il.com:
> On 15-05-27 09:31:50, Paul Bolle wrote:
>> On Tue, 2015-05-26 at 17:06 +0530, Sanchayan Maity wrote:
>>> --- /dev/null
>>> +++ b/drivers/soc/fsl/Kconfig
>>
>>> +config SOC_VF610
>>> +	   bool "SoC bus device for the Freescale Vybrid platform"
>>> +	   select SOC_BUS
>>> +	   help
>>> +	     Include support for the SoC bus on the Freescale Vybrid platform
>>> +	     providing some sysfs information about the module variant.
>>> \ No newline at end of file
[...]
>>> --- /dev/null
>>> +++ b/drivers/soc/fsl/Makefile
>>
>>> +obj-$(CONFIG_SOC_VF610)		+= soc-vf610.o
>>
>>> --- /dev/null
>>> +++ b/drivers/soc/fsl/soc-vf610.c
>>
>>> +MODULE_DEVICE_TABLE(of, vf610_soc_bus_match);
>>
>>> +module_platform_driver(vf610_soc_driver);
>>
>> (The series starting at https://lkml.org/lkml/2015/5/10/131 would allow
>> to use builtin_platform_driver() for built-in only code.)
[...]
>>> +MODULE_DESCRIPTION("Freescale VF610 SoC bus driver");
>>> +MODULE_LICENSE("GPL v2");
>>
>> I think soc-vf610.o can only be built-in. But its code contains a few
>> module specific macros. Was it perhaps intended for SOC_VF610 to be
>> tristate?
> 
> I too think that should be built-in.

Why? For a generic distro kernel it'd be unfortunate to not allow
putting such a driver into an initrd, if needed early, or into the
rootfs otherwise.

Regards,
Andreas

> Did not have an intention of making
> it tristate, however while using other drivers as references, the perhaps
> unneccessary stuff crept in.
> 
> The MODULE_* references can be removed along with the corresponding header
> file. However that series has not been merged yet, so I can't use builtin_*
> yet?
[snip]

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