linux-kernel - Re: [PATCH (v6) 2/2] mtd: brcmnand: Add support for the BCM63268

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Date:	Wed, 25 Nov 2015 13:53:09 +0100
From:	Jonas Gorski <jogo@...nwrt.org>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	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>
Subject: Re: [PATCH (v6) 2/2] mtd: brcmnand: Add support for the BCM63268

On Wed, Nov 25, 2015 at 1:37 PM, Simon Arlott <simon@...e.lp0.eu> wrote:
> On Wed, November 25, 2015 10:44, Jonas Gorski wrote:
>> On Tue, Nov 24, 2015 at 9:21 PM, Simon Arlott <simon@...e.lp0.eu> wrote:
>>> The BCM63268 has a NAND interrupt register with combined status and enable
>>> registers. It also has a clock for the NAND controller that needs to be
>>> enabled.
>>>
>>> Set up the device by enabling the clock, disabling and acking all
>>> interrupts, then handle the CTRL_READY interrupt.
>>>
>>> Add a brcmnand_get_socdata() function so that bcm63268_nand can obtain its
>>> data and disable the clock when the device is removed.
>>
>> To me this now mostly looks good, one thing though ...
>> (snip)
>>> diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c
>>> index 2c8f67f..99ca69e 100644
>>> --- a/drivers/mtd/nand/brcmnand/brcmnand.c
>>> +++ b/drivers/mtd/nand/brcmnand/brcmnand.c
>>> @@ -2262,6 +2262,13 @@ int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
>>>  }
>>>  EXPORT_SYMBOL_GPL(brcmnand_probe);
>>>
>>> +struct brcmnand_soc *brcmnand_get_socdata(struct platform_device *pdev)
>>> +{
>>> +       struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev);
>>> +
>>> +       return ctrl ? ctrl->soc : NULL;
>>> +}
>>> +
>>
>> Don't you need to EXPORT_SYMBOL_GPL this one in case you build
>> brcmnand as module?
>
> No, because all of the code is built into the one object file:

No it is not:

$ grep BRCMNAND .config
CONFIG_MTD_NAND_BRCMNAND=m
$ make
...
  LD      drivers/mtd/nand/brcmnand/built-in.o
  CC [M]  drivers/mtd/nand/brcmnand/iproc_nand.o
  CC [M]  drivers/mtd/nand/brcmnand/bcm63138_nand.o
  CC [M]  drivers/mtd/nand/brcmnand/brcmstb_nand.o
  CC [M]  drivers/mtd/nand/brcmnand/brcmnand.o
...
  Building modules, stage 2.
  MODPOST 6 modules
  CC      drivers/mtd/nand/brcmnand/bcm63138_nand.mod.o
  LD [M]  drivers/mtd/nand/brcmnand/bcm63138_nand.ko
  CC      drivers/mtd/nand/brcmnand/brcmnand.mod.o
  LD [M]  drivers/mtd/nand/brcmnand/brcmnand.ko
  CC      drivers/mtd/nand/brcmnand/brcmstb_nand.mod.o
  LD [M]  drivers/mtd/nand/brcmnand/brcmstb_nand.ko
  CC      drivers/mtd/nand/brcmnand/iproc_nand.mod.o
  LD [M]  drivers/mtd/nand/brcmnand/iproc_nand.ko

$

> obj-$(CONFIG_MTD_NAND_BRCMNAND)         += iproc_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND)         += bcm63138_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND)         += bcm63268_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND)         += brcmstb_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND)         += brcmnand.o

for this to be built into one it would have to look like:

obj-$(CONFIG_MTD_NAND_BRCMNAND)            += brcmnand_all.o
brcmnand_all-y         += iproc_nand.o
brcmnand_all-y         += bcm63138_nand.o
brcmnand_all-y         += bcm63268_nand.o
brcmnand_all-y         += brcmstb_nand.o
brcmnand_all-y         += brcmnand.o



Jonas
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