linux-kernel - Re: [PATCH] drivers/memory/Kconfig: Add CONFIG

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Date:   Mon, 23 Jul 2018 18:04:52 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH] drivers/memory/Kconfig: Add CONFIG_OF dependency

On Mon, Jul 23, 2018 at 5:40 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Mon, Jul 23, 2018 at 11:41 AM, Boris Brezillon
> <boris.brezillon@...tlin.com> wrote:
>> On Mon, 23 Jul 2018 11:34:43 +0200
>> Arnd Bergmann <arnd@...db.de> wrote:
>>
>>> On Sun, Jul 22, 2018 at 8:29 AM, Boris Brezillon
>>> <boris.brezillon@...tlin.com> wrote:
>>> > +Arnd, Rob and the DT ML.
>>> >
>>> > On Sat, 21 Jul 2018 14:53:47 -0700
>>> > Randy Dunlap <rdunlap@...radead.org> wrote:
>>> >
>>> >> On 07/21/2018 01:00 PM, Anders Roxell wrote:
>>> >> > JZ4780_NEMC doesn't depend on OF, and if OF isn't enabled we get this
>>> >> > error:
>>> >> > drivers/memory/jz4780-nemc.c: In function ‘jz4780_nemc_num_banks’:
>>> >> > drivers/memory/jz4780-nemc.c:72:10: error: implicit declaration of
>>> >> >  function ‘of_read_number’; did you mean ‘down_read_nested’?
>>> >> >  [-Werror=implicit-function-declaration]
>>> >> >    bank = of_read_number(prop, 1);
>>> >> >           ^~~~~~~~~~~~~~
>>> >> >           down_read_nested
>>> >
>>> > Looks like of.h defines stubs so that people can compile-test without
>>> > CONFIG_OF selected. Maybe we should move of_read_number() and
>>> > of_read_ulong() out of the #ifdef CONFIG_OF section.
>>>
>>> That seems fine, though the added dependency seems appropriate
>>> here as well. of_read_number() is rarely used, and for the most part in
>>> powerpc specific code that is guaranteed to have CONFIG_OF enabled,
>>> so it's not that likely to cause many more problems.
>>
>> Ok, then I'll let Miquel apply Anders' patch to the NAND tree.
>>
>> Thanks for your feedback.
>
> My randconfig build bot just ran into a second problem with this driver
> with CONFIG_GPIOLIB disabled:
>
> drivers/mtd/nand/raw/jz4740_nand.c: In function 'jz_nand_dev_ready':
> drivers/mtd/nand/raw/jz4740_nand.c:133:9: error: implicit declaration
> of function 'gpiod_get_value_cansleep'; did you mean
> 'gpio_get_value_cansleep'? [-Werror=implicit-function-declaration]
>   return gpiod_get_value_cansleep(nand->busy_gpio);
>          ^~~~~~~~~~~~~~~~~~~~~~~~
>          gpio_get_value_cansleep
> drivers/mtd/nand/raw/jz4740_nand.c: In function 'jz_nand_probe':
> drivers/mtd/nand/raw/jz4740_nand.c:388:20: error: implicit declaration
> of function 'devm_gpiod_get_optional'; did you mean
> 'devm_gpio_request_one'? [-Werror=implicit-function-declaration]
>   nand->busy_gpio = devm_gpiod_get_optional(&pdev->dev, "busy", GPIOD_IN);
>                     ^~~~~~~~~~~~~~~~~~~~~~~
>                     devm_gpio_request_one
> drivers/mtd/nand/raw/jz4740_nand.c:388:64: error: 'GPIOD_IN'
> undeclared (first use in this function); did you mean 'GPIOF_IN'?
>   nand->busy_gpio = devm_gpiod_get_optional(&pdev->dev, "busy", GPIOD_IN);
>                                                                 ^~~~~~~~
>                                                                 GPIOF_IN
>
>
> We could add another dependency here or (my preference) include
> linux/gpio/consumer.h to fix that. Do you want a separate patch for
> it, or should Anders send a combined patch?

One more failure, not analyzed yet:

/git/arm-soc/drivers/mtd/nand/raw/jz4740_nand.c: In function
'jz_nand_select_chip':
/git/arm-soc/drivers/mtd/nand/raw/jz4740_nand.c:87:9: error: implicit
declaration of function 'readl'; did you mean 'krealloc'?
[-Werror=implicit-function-declaration]
  ctrl = readl(nand->base + JZ_REG_NAND_CTRL);
         ^~~~~

        Arnd