[PATCH 2/4] of/gpio: Add support for two-stage registration for the of_gpio_chips

[David Brownell]

On Monday 25 January 2010, Anton Vorontsov wrote:
> With this patch there are two ways to register OF GPIO controllers:
> 
> 1. Allocating the of_gpio_chip structure and passing the
>    &of_gc->gc pointer to the gpiochip_add. (Can use container_of
>    to convert the gpio_chip to the of_gpio_chip.)
> 
> 2. Allocating and registering the gpio_chip structure separately
>    from the of_gpio_chip. (Since two allocations are separate,
>    container_of won't work.)
> 
> As time goes by we'll kill the first option.

Why have two options, instead of just the first/simpler one??