[U-Boot] [PATCH 3/4] gpio: atmel: add gpio common API support

["Andreas Bießmann" <andreas.devel@googlemail.com>]

On 08/13/2013 08:38 AM, Bo Shen wrote:
> add gpio common API support for gpio command
> 
> Signed-off-by: Bo Shen <voice.shen@atmel.com>
> ---
>  drivers/gpio/at91_gpio.c |   43 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
> 
> diff --git a/drivers/gpio/at91_gpio.c b/drivers/gpio/at91_gpio.c
> index 15f396f..3de0844 100644
> --- a/drivers/gpio/at91_gpio.c
> +++ b/drivers/gpio/at91_gpio.c
> @@ -363,3 +363,46 @@ int at91_get_pio_value(unsigned port, unsigned pin)
>  
>  	return pdsr != 0;
>  }
> +
> +/* Common GPIO API */
> +
> +#define at91_gpio_to_port(gpio)		(gpio / 32)
> +#define at91_gpio_to_pin(gpio)		(gpio % 32)
> +
> +int gpio_request(unsigned gpio, const char *label)
> +{
> +	return 0;
> +}
> +
> +int gpio_free(unsigned gpio)
> +{
> +	return 0;
> +}
> +
> +int gpio_direction_input(unsigned gpio)
> +{
> +	at91_set_pio_input(at91_gpio_to_port(gpio),
> +			   at91_gpio_to_pin(gpio), 0);
> +	return 0;
> +}
> +
> +int gpio_direction_output(unsigned gpio, int value)
> +{
> +	at91_set_pio_output(at91_gpio_to_port(gpio),
> +			    at91_gpio_to_pin(gpio), value);
> +	return 0;
> +}
> +
> +int gpio_get_value(unsigned gpio)
> +{
> +	return (int) at91_get_pio_value(at91_gpio_to_port(gpio),
> +					at91_gpio_to_pin(gpio));

why cast to int here?

> +}
> +
> +int gpio_set_value(unsigned gpio, int value)
> +{
> +	at91_set_pio_value(at91_gpio_to_port(gpio),
> +			   at91_gpio_to_pin(gpio), value);
> +
> +	return 0;
> +}
> 

Great, I love this. But wasn't there some define for generic GPIO?
Shouldn't we encapsulate this API into this other define?

Best regards

Andreas Bie?mann