[alsa-devel] [PATCH 2/2 v2] ALSA: ASoC: Add reset-gpio DT property to cs4270 driver

Mark Brown broonie at opensource.wolfsonmicro.com
Wed Jul 25 15:18:16 CEST 2012

On Wed, Jul 25, 2012 at 09:03:29AM +0200, Daniel Mack wrote:
> In the process of moving over from static board files to the device
> tree, reset pins of peripheral reset pins should be handled by their
> corresponding drivers.
> Add a reset-gpio DT property to the cs4270 driver, and de-assert it
> before probing the chip. The logic could be augmented some day to
> re-assert it when codec is put to suspend.

I'm missing 1/2...  Please also don't bury patches in the middle of
previous threads.

> +		enum of_gpio_flags flags;
> +		int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
> +
> +		if (gpio_is_valid(gpio))
> +			devm_gpio_request_one(&i2c_client->dev, gpio,
> +				     flags & OF_GPIO_ACTIVE_LOW ?
> +				     "cs4270 reset");

This ignores the return code and won't work well with probe deferral, if
we manage to get a GPIO from the DT then we should fail if we're unable
request it.  Passing back the return code should get you deferral
support for free in 3.6 and onwards.
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