linux-kernel - Re: [PATCH] mmc: Kconfig: Add dependency on GPIOLIB for MMC

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Date:	Thu, 27 Aug 2015 14:30:30 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Simek <monstr@...str.eu>,
	Scott Branden <sbranden@...adcom.com>,
	Weijun Yang <Weijun.Yang@....com>,
	Andrew Bresticker <abrestic@...omium.org>,
	Jean Delvare <jdelvare@...e.de>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	addy ke <addy.ke@...k-chips.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Chaotian Jing <chaotian.jing@...iatek.com>,
	Kevin Hao <haokexin@...il.com>,
	Vincent Yang <vincent.yang.fujitsu@...il.com>
Subject: Re: [PATCH] mmc: Kconfig: Add dependency on GPIOLIB for MMC_SDHCI

On 27 August 2015 at 13:43, Michal Simek <michal.simek@...inx.com> wrote:
> Hi Ulf,
>
> On 08/27/2015 01:32 PM, Ulf Hansson wrote:
>> On 25 August 2015 at 14:04, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>>> On 6 August 2015 at 07:39, Michal Simek <michal.simek@...inx.com> wrote:
>>>> Add GPIOLIB dependency for MMC_SDHCI.
>>>>
>>>> Problem was observed after adding the patch
>>>> "mmc: sdhci-of-arasan: Call OF parsing for MMC"
>>>> (sha1: 16b23787fc709fe60c5d2bd05927b1a3da33d4e9) which calls
>>>> mmc_of_parse() -> mmc_gpiod_request_cd() (slot-gpio.c) which
>>>> calls devm_gpiod_get_index() which returns -ENOSYS.
>>>>
>>>> Error log:
>>>> sdhci-arasan ff160000.sdhci: parsing dt failed (4294967258)
>>>> sdhci-arasan: probe of ff160000.sdhci failed with error -38
>>>>
>>>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>>>
>>> Thanks, applied for next!
>>
>> kbuild test robot reports a warning for this one, so I am dropping it
>> from my next branch.
>
> I think is just better to fix the problem there instead of dropping this
> patch which fix GPIO dependency.
>
> Fix is quite easy.
> diff --git a/arch/powerpc/platforms/44x/Kconfig
> b/arch/powerpc/platforms/44x/Kconfig
> index 5538e57c36c1..874f07c7d0b8 100644
> --- a/arch/powerpc/platforms/44x/Kconfig
> +++ b/arch/powerpc/platforms/44x/Kconfig
> @@ -219,6 +219,7 @@ config AKEBONO
>         select USB_EHCI_HCD_PLATFORM if USB_EHCI_HCD
>         select MMC_SDHCI
>         select MMC_SDHCI_PLTFM
> +       select GPIOLIB
>         select ATA
>         select SATA_AHCI_PLATFORM
>         help
>
> But the question is if we should keep these ancient targets in the tree.
>
> I am happy to send this patch but it should go via PPC tree. Or are you
> happy to apply it to your tree?

It's getting really late for 4.3 so I would rather postpone this to
the next release cycle.

As I stated in my earlier reply, do we really want to add the GPIOLIB
dependency to the Kconfig file for SDHCI?
I assume we have lots of other Kconfig dependencies, then these should
also to be added for the same reasons. I doubt this is the right thing
to do.

How about if the mmc core instead treat GPIOs as optional from an API
point of view and thus it won't cause ->probe() to fail. Is that a way
forward for you?

Kind regards
Uffe
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