linux-kernel - Re: [alsa-devel] [PATCH 2/6] ASoC: codecs: AK4641 depends on GPIOLIB

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Date:	Mon, 3 Oct 2011 17:34:41 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	alsa-devel@...a-project.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Dmitry Artamonow <mad_soft@...ox.ru>,
	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [alsa-devel] [PATCH 2/6] ASoC: codecs: AK4641 depends on
 GPIOLIB

On Mon, Oct 03, 2011 at 06:19:48PM +0200, Arnd Bergmann wrote:

> When the GPIO API is stubbed out, the definition of struct gpio
> is empty, so you cannot access the members, which seems to be
> intentional behavior.

That doesn't seem terribly helpful, it means drivers either need to
ifdef or not use the bulk functions.

>  struct device;
> -struct gpio;
> +struct gpio {
> +       unsigned        gpio;
> +       unsigned long   flags;
> +       const char      *label;
> +};

This looks much more sensible to me.

>  	select SND_SOC_WL1273 if MFD_WL1273_CORE
> -	select SND_SOC_WM1250_EV1 if I2C
> +	select SND_SOC_WM1250_EV1 if I2C && GENERIC_GPIO

Or ifdefs in the driver.
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