linux-kernel - Re: [PATCH v2 1/2] pinctrl: Add driver for Alphascale asm9260 pinctrl

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Date:	Sun, 05 Apr 2015 07:49:50 +0200
From:	Oleksij Rempel <linux@...pel-privat.de>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	linus.walleij@...aro.org, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] pinctrl: Add driver for Alphascale asm9260 pinctrl

Hi Paul,

thank you for your review.

Am 27.03.2015 um 18:10 schrieb Paul Bolle:
> This patch adds a mismatch between the Kconfig symbol (bool) and the
> code (which assumes a modular built too).
> 
> On Fri, 2015-03-27 at 10:36 +0100, Oleksij Rempel wrote:
>> --- a/drivers/pinctrl/Kconfig
>> +++ b/drivers/pinctrl/Kconfig
>> @@ -47,6 +47,14 @@ config PINCTRL_AS3722
>>  	  open drain configuration for the GPIO pins of AS3722 devices. It also
>>  	  supports the GPIO functionality through gpiolib.
>>  
>> +config PINCTRL_ASM9260
>> +	bool "Pinctrl driver for Alphascale asm9260"
> 
> This adds a bool symbol.
> 
>> +	depends on MACH_ASM9260
>> +	select PINMUX
>> +	select GENERIC_PINCONF
>> +	help
>> +	  Say Y here to enable the Alphascale asm9260 pinctrl driver
>> +
> 
>> -- a/drivers/pinctrl/Makefile
>> +++ b/drivers/pinctrl/Makefile
> 
>> +obj-$(CONFIG_PINCTRL_ASM9260)	+= pinctrl-asm9260.o
> 
> So this object can now only be built-in.
> 
>> --- /dev/null
>> +++ b/drivers/pinctrl/pinctrl-asm9260.c
>> @@ -0,0 +1,733 @@
>> +/*
>> + * Pinctrl driver for the Alphascale ASM9260 SoC
>> + *
>> + * Copyright (c) 2014, Oleksij Rempel <linux@...pel-privat.de>
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms and conditions of the GNU General Public License,
>> + * version 2, as published by the Free Software Foundation.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
> 
> This include is probably not needed.

This include is still needed for MODULE_DEVICE_TABLE.

>> +#include <linux/pinctrl/pinconf-generic.h>
>> +#include <linux/pinctrl/pinmux.h>
>> +#include <linux/platform_device.h>
>> +
>> +#include "core.h"
>> +#include "pinctrl-utils.h"
> 
>> +/*
>> + * Pin control driver setup
>> + */
>> +static struct pinctrl_desc asm9260_pinctrl_desc = {
>> +	.pctlops	= &asm9260_pinctrl_ops,
>> +	.pmxops		= &asm9260_pinmux_ops,
>> +	.confops	= &asm9260_pinconf_ops,
>> +	.owner		= THIS_MODULE,
> 
> THIS_MODULE is, basically, equivalent to NULL for built-in code.
> 
>> +};
>> +
> 
>> +MODULE_DEVICE_TABLE(of, asm9260_pinctrl_of_match);
> 
> This will be preprocessed away for built-in code.
> 
>> +module_platform_driver(asm9260_pinctrl_driver);
> 
> The built-in equivalent of this seems to be a wrapper that
> only does
>     platform_driver_register(&asm9260_pinctrl_driver);
> 
> and mark that wrapper as a device_initcall(). There appears to be no
> macro that does all that in one line.
> 
>> +MODULE_AUTHOR("Oleksij Rempel <linux@...pel-privat.de>");
>> +MODULE_DESCRIPTION("Alphascale ASM9260 pinctrl driver");
>> +MODULE_LICENSE("GPL");
> 
> These three macros will be, effectively, preprocessed away for built-in
> code. (By the way, you probably want to use "GPL v2" as the license
> ident if it would be possible to build this code modular.)
> 

According to:
http://lxr.free-electrons.com/source/include/linux/module.h#L100
"GPL"                          [GNU Public License v2 or later]

which reflects statement provided in the header :)

I assume all this changes are in the grey zone between: "make it pretty"
and "it won't make any difference" :D

Are you ok if we leave it as is?

-- 
Regards,
Oleksij


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