linux-kernel - Re: [PATCH v2] mmc: mmci.c: Defer probe() in case of yet uninitialized GPIOs

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Date:	Sat, 16 Jun 2012 21:04:17 +0200
From:	Roland Stigge <stigge@...com.de>
To:	Arnd Bergmann <arnd@...db.de>
CC:	linux-arm-kernel@...ts.infradead.org, cjb@...top.org,
	grant.likely@...retlab.ca, rob.herring@...xeda.com,
	rmk+kernel@....linux.org.uk, ulf.hansson@...ricsson.com,
	linus.walleij@...aro.org, sebastian.rasmussen@...ricsson.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	aletes.xgr@...il.com
Subject: Re: [PATCH v2] mmc: mmci.c: Defer probe() in case of yet uninitialized
 GPIOs

On 16/06/12 19:23, Arnd Bergmann wrote:
> On Saturday 16 June 2012, Roland Stigge wrote:
>> +       if (of_get_property(np, "wp-gpios", NULL)) {
>> +               pdata->gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
>> +               if (pdata->gpio_wp == -ENODEV)
>> +                       pdata->gpio_wp = -EPROBE_DEFER;
>> +       } else {
>> +               pdata->gpio_wp = -ENODEV;
>> +       }
> 
> This is still very ugly and there is a certain danfer that we might
> have to duplicate this across more drivers. Can't we make
> of_get_named_gpio_flags return -EPROBE_DEFER in cases where we can't
> find the GPIO number yet but still have a chance of returning it at
> a later point?

OK, will post a new patch.

Roland
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