linux-kernel - Re: [PATCH v2 3/3] mtd: nand: tmio_nand.c: prefer sharpslpart MTD partition parser

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Date:   Thu, 25 May 2017 22:47:37 +0200
From:   Andrea Adami <andrea.adami@...il.com>
To:     Brian Norris <computersforpeace@...il.com>
Cc:     linux-mtd@...ts.infradead.org,
        David Woodhouse <dwmw2@...radead.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <zajec5@...il.com>
Subject: Re: [PATCH v2 3/3] mtd: nand: tmio_nand.c: prefer sharpslpart MTD
 partition parser

On Thu, May 25, 2017 at 9:25 PM, Brian Norris
<computersforpeace@...il.com> wrote:
> On Sat, Apr 22, 2017 at 01:20:13PM +0200, Andrea Adami wrote:
>> This is the specific parser for Sharp SL Series (Zaurus)
>>
>> Signed-off-by: Andrea Adami <andrea.adami@...il.com>
>> ---
>>  drivers/mtd/nand/tmio_nand.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/mtd/nand/tmio_nand.c b/drivers/mtd/nand/tmio_nand.c
>> index fc5e773..f3612ac 100644
>> --- a/drivers/mtd/nand/tmio_nand.c
>> +++ b/drivers/mtd/nand/tmio_nand.c
>> @@ -357,6 +357,8 @@ static void tmio_hw_stop(struct platform_device *dev, struct tmio_nand *tmio)
>>               cell->disable(dev);
>>  }
>>
>> +static const char * const probes[] = { "sharpslpart", NULL };
>
> This breaks anyone who might have used (or might want to use) the ofpart
> or cmdlinepart parsers. At a minimum, you need to include those in your
> array here.

I have been under the wrong assumption there is cmdlinepart as last
option (if compiled) so I have taken a wrong example.
Grepping in /mt for probes gives many examples: what if I change it with

static const char * const probes[] = { "sharpslpart", "cmdlinepart", NULL };

ofpart is utopic at the moment: these machines are not yet converted
to devicetree and it will take a while.

With this patchset we can move a step forward DT, removing all the
static partition definition from spitz.c, tosa.c, corgi.c and poodle.c

I don't dare adding ofpart here: this will be done once Zaurus pxa
platform is moved to devicetree.

>
> But really, I'd rather not add any more parser listings like this in
> drivers. Parser selection should be determined by the platform, not by
> the driver. See my last response to Rafal, who is trying to extend
> support for device-tree based listing of parsers:
>
> http://lists.infradead.org/pipermail/linux-mtd/2017-April/073729.html

Ok then but remember these are obsolete devices and as far as I know
these nand drivers are only used on Zaurus devices. No future use I
guess.

>
> He has some more work posted to the mailing list since then; search the
> archives.
>
> I'll take a look at the parser itself, and maybe we can merge that. But
> I'm not likely to merge this patch, in any form.
>
The little parser itself is universal for all Zaurus pxa variants.
As said above, please consider we can remove many lines of board code.

Thanks
Andrea

> Brian
>
>> +
>>  static int tmio_probe(struct platform_device *dev)
>>  {
>>       struct tmio_nand_data *data = dev_get_platdata(&dev->dev);
>> @@ -440,7 +442,7 @@ static int tmio_probe(struct platform_device *dev)
>>               goto err_irq;
>>
>>       /* Register the partitions */
>> -     retval = mtd_device_parse_register(mtd, NULL, NULL,
>> +     retval = mtd_device_parse_register(mtd, probes, NULL,
>>                                          data ? data->partition : NULL,
>>                                          data ? data->num_partitions : 0);
>>       if (!retval)
>> --
>> 2.7.4
>>