[PATCH 2/2] gpiolib: import gpio_request_array() from linux 3.7

[Sascha Hauer]

Hi Antony,

On Fri, Nov 22, 2013 at 12:11:24AM +0400, Antony Pavlov wrote:
> Also import related functions gpio_request_one() and
> gpio_free_array().
> 
> This commit imports code from linux 3.7 as
> the more recent linux kernel versions use gpiolib descriptors,
> see this commit for details:
> 
>   commit 372e722ea4dd4ca11c3d04845e11cbc15f32144c
>   Author: Alexandre Courbot <acourbot at nvidia.com>
>   Date:   Sun Feb 3 01:29:29 2013 +0900
> 
>       gpiolib: use descriptors internally
> 
>       Make sure gpiolib works internally with descriptors and (chip, offset)
>       pairs instead of using the global integer namespace. This prepares the
>       ground for the removal of the global gpio_desc[] array and the
>       introduction of the descriptor-based GPIO API.
> 
> Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>

What a pitty, we duplicated some work. I created exactly the same patch
recently but haven't posted it yet, shame on me.

> +static inline int gpio_request_one(unsigned gpio,
> +					unsigned long flags, const char *label)
> +{
> +	return 0;
> +}
> +
> +static inline int gpio_request_array(const struct gpio *array, size_t num)
> +{
> +	return 0;
> +}
> +

That's the only place our patches differ. In my version I return -ENOSYS
since gpio_request_one() and gpio_request_array() not only request gpios
but also configure them. We can't return success without configuring the
gpios. I applied your version but with -ENOSYS here.

Sascha

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