linux-kernel - Re: [RFC PATCH] mmc: Kconfig: Add dependency on GPIOLIB for Arasan driver

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Date:	Tue, 28 Jul 2015 10:30:16 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	Scott Branden <sbranden@...adcom.com>,
	Michal Simek <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>, <monstr@...str.eu>
CC:	Weijun Yang <Weijun.Yang@....com>,
	Andrew Bresticker <abrestic@...omium.org>,
	Jean Delvare <jdelvare@...e.de>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	<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>,
	"Georgi Djakov" <gdjakov@...sol.com>,
	Kevin Hao <haokexin@...il.com>,
	Vincent Yang <vincent.yang.fujitsu@...il.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [RFC PATCH] mmc: Kconfig: Add dependency on GPIOLIB for Arasan
 driver

On 07/27/2015 11:55 PM, Scott Branden wrote:
> Hi Michal,
> 
> comment in line
> 
> On 15-07-24 06:53 AM, Michal Simek wrote:
>> The patch "mmc: sdhci-of-arasan: Call OF parsing for MMC"
>> (sha1: 16b23787fc709fe60c5d2bd05927b1a3da33d4e9) introduce new
>> dependency on GPIOLIB 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>
>> ---
>>
>> This problem is probably in all others drivers.
>> This is one way how this can be solved.
>> Maybe better way is to block return value for cd and wp.
> 
> It appears there is gpio code in sdhci.c as well.  This uses slot-gpio.
> 
> Perhaps a depends on needs to be added to MMC_SDHCI instead?

yes, I know and that's why I did this as RFC. But also not all drivers
calls mmc_of_parse to reach this fault.
Anyway I am happy to send v2 with GPIOLIB dependency for the whole MMC
subsystem.

Thanks,
Michal

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