linux-kernel - Re: [PATCH v6 2/2] memory: pl353: Add driver for arm pl353 static memory controller

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Date:	Tue, 14 Apr 2015 12:14:32 +0530
From:	punnaiah choudary kalluri <punnaia@...inx.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	"michal.simek@...inx.com" <michal.simek@...inx.com>,
	Grant Likely <grant.likely@...aro.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jason@...edaemon.net" <jason@...edaemon.net>,
	"ezequiel.garcia@...e-electrons.com" 
	<ezequiel.garcia@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	"artem.bityutskiy@...ux.intel.com" <artem.bityutskiy@...ux.intel.com>,
	"jussi.kivilinna@....fi" <jussi.kivilinna@....fi>,
	Alexandre Courbot <acourbot@...dia.com>,
	"Khoronzhuk, Ivan" <ivan.khoronzhuk@...com>,
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	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Punnaiah Choudary <kpc528@...il.com>
Subject: Re: [PATCH v6 2/2] memory: pl353: Add driver for arm pl353 static
 memory controller

Hi Paul Bolle

On Tue, Apr 14, 2015 at 12:19 AM, Paul Bolle <pebolle@...cali.nl> wrote:
> On Mon, 2015-04-13 at 21:41 +0530, Punnaiah Choudary Kalluri wrote:
>> --- a/drivers/memory/Kconfig
>> +++ b/drivers/memory/Kconfig
>
>> +config PL353_SMC
>> +     bool "ARM PL353 Static Memory Controller (SMC) driver"
>> +     depends on ARM
>> +     help
>> +       This driver is for the ARM PL353 Static Memory Controller (SMC)
>> +       module.
>
> This adds a bool symbol.
>
>> --- a/drivers/memory/Makefile
>> +++ b/drivers/memory/Makefile
>
>> +obj-$(CONFIG_PL353_SMC)              += pl353-smc.o
>
> Which means pl353-smc.o can never be part of a module, right?
>
> (If that's not right you can stop reading here.)
>
>> --- /dev/null
>> +++ b/drivers/memory/pl353-smc.c
>
>> + * This program is free software: you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation, either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>
> This states the license is GPL v2 or later.
>
>> +#include <linux/module.h>
>
> I wonder whether this include is needed, since this is built-in only
> code.
>
>> +MODULE_DEVICE_TABLE(of, pl353_smc_of_match);
>
> According to include/linux/module.h this will be preprocessed away for
> built-in code.
>
>> +static struct platform_driver pl353_smc_driver = {
>> +     .probe          = pl353_smc_probe,
>> +     .remove         = pl353_smc_remove,
>> +     .driver         = {
>> +             .name   = "pl353-smc",
>> +             .owner  = THIS_MODULE,
>
> THIS_MODULE will be equivalent to NULL for built-in code, according to
> include/linux/export.h.
>
>> +             .pm     = &pl353_smc_dev_pm_ops,
>> +             .of_match_table = pl353_smc_of_match,
>> +     },
>> +};
>
>> +module_platform_driver(pl353_smc_driver);
>
> Speaking from memory: for built-in only code this is equivalent to
> having a wrapper that only does
>     register_platform_driver(&pl353_smc_driver);
>
> and mark that wrapper with device_initcall().
>
>> +MODULE_AUTHOR("Xilinx, Inc.");
>> +MODULE_DESCRIPTION("ARM PL353 SMC Driver");
>> +MODULE_LICENSE("GPL v2");
>
> For built-in only code these macros will be effectively preprocessed
> away.
>
> (Would you make PL353_SMC a tristate symbol then you should note that
> according to include/linux/module.h "GPL" is the license ident that
> matches the license stated in the comment at the top of this file.)

Ok. I will make PL353_SMC as tristate symbol and also i will change the
licence ident to "GPL".

Thanks for the review.

I will wait some time for further functional comments on this driver before
sending the next version of patches

Thanks,
Punnaiah
>
> Thanks,
>
>
> Paul Bolle
>
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