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

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Date:   Mon, 23 Jul 2018 17:40:29 +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 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?

      Arnd