linux-kernel - Re: [PATCH (v4) 2/2] mtd: brcmnand: Add support for the BCM63268

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Message-ID: <56535D15.7070307@simon.arlott.org.uk>
Date:	Mon, 23 Nov 2015 18:38:13 +0000
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Jonas Gorski <jogo@...nwrt.org>
Cc:	Rob Herring <robh@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Brian Norris <computersforpeace@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	MTD Maling List <linux-mtd@...ts.infradead.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH (v4) 2/2] mtd: brcmnand: Add support for the BCM63268

On 23/11/15 15:42, Jonas Gorski wrote:
> On Sun, Nov 22, 2015 at 11:17 PM, Simon Arlott <simon@...e.lp0.eu> wrote:
>> +       priv->clk = of_clk_get(dev->of_node, 0);
> 
> 
> Why not use a named clock here? That way you can make use of
> devm_clk_get and don't need to care about putting it.

Ok.

>> +
>> +static struct platform_driver bcm63268_nand_driver = {
>> +       .probe                  = bcm63268_nand_probe,
>> +       .remove                 = brcmnand_remove,
>> +       .driver = {
>> +               .name           = "bcm63268_nand",
>> +               .pm             = &brcmnand_pm_ops,
>> +               .of_match_table = bcm63268_nand_of_match,
>> +       }
>> +};
>> +module_platform_driver(bcm63268_nand_driver);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Simon Arlott");
>> +MODULE_DESCRIPTION("NAND driver for BCM63268");
>> diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
>> index 2c8f67f..7b4988f 100644
>> --- a/drivers/mtd/nand/brcmnand/brcmnand.c
>> +++ b/drivers/mtd/nand/brcmnand/brcmnand.c
>> @@ -2270,6 +2270,9 @@ int brcmnand_remove(struct platform_device *pdev)
>>         list_for_each_entry(host, &ctrl->host_list, node)
>>                 nand_release(&host->mtd);
>>
>> +       if (ctrl->soc && ctrl->soc->remove_device)
>> +               ctrl->soc->remove_device(ctrl->soc);
>> +
> 
> This is a bit weird, why don't you just use your own .remove callback
> for the driver that like you did for .probe? then you won't need to
> add a remove_device callback at all.

I don't have access to the struct brcmnand_soc which is stored by
brcmnand_probe() as the containing struct is defined in brcmnand.c.

I could move that struct out to a header file and use it directly from a
bcm63268_nand_remove() function but I'd have to move a few other defines
too.

>>         dev_set_drvdata(&pdev->dev, NULL);
>>
>>         return 0;
>> diff --git a/drivers/mtd/nand/brcmnand/brcmnand.h b/drivers/mtd/nand/brcmnand/brcmnand.h
>> index ef5eabb..5c5dc2d 100644
>> --- a/drivers/mtd/nand/brcmnand/brcmnand.h
>> +++ b/drivers/mtd/nand/brcmnand/brcmnand.h
>> @@ -24,6 +24,7 @@ struct brcmnand_soc {
>>         bool (*ctlrdy_ack)(struct brcmnand_soc *soc);
>>         void (*ctlrdy_set_enabled)(struct brcmnand_soc *soc, bool en);
>>         void (*prepare_data_bus)(struct brcmnand_soc *soc, bool prepare);
>> +       void (*remove_device)(struct brcmnand_soc *soc);
>>  };
>>
>>  static inline void brcmnand_soc_data_bus_prepare(struct brcmnand_soc *soc)
> 
> 
> Jonas
> 


-- 
Simon Arlott
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