gpio: export add/remove lookup table functions

For hot-pluggable devices adding GPIOs dynamically we need to
assemble and add the gpio lookup tables at probe time in modules,
so that requesting these GPIOs in attached drivers can work.
Export lookup table functions for modules.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
---
 drivers/gpio/gpiolib.c | 2 ++
 1 file changed, 2 insertions(+)

On Fri, Apr 21, 2017 at 12:23 AM, Anatolij Gustschin <agust@denx.de> wrote:
> For hot-pluggable devices adding GPIOs dynamically we need to
> assemble and add the gpio lookup tables at probe time in modules,
> so that requesting these GPIOs in attached drivers can work.
> Export lookup table functions for modules.
>
> Signed-off-by: Anatolij Gustschin <agust@denx.de>

...and still a question "Do we go with stubs for them in case of !GPIOLIB?"

Patch below looks good to me:
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> ---
>  drivers/gpio/gpiolib.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index 4aa1e78..9196b1e 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -3008,6 +3008,7 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
>
>         mutex_unlock(&gpio_lookup_lock);
>  }
> +EXPORT_SYMBOL_GPL(gpiod_add_lookup_table);
>
>  /**
>   * gpiod_remove_lookup_table() - unregister GPIO device consumers
> @@ -3021,6 +3022,7 @@ void gpiod_remove_lookup_table(struct gpiod_lookup_table *table)
>
>         mutex_unlock(&gpio_lookup_lock);
>  }
> +EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table);
>
>  static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev)
>  {
> --
> 2.7.4
>

On Fri, 21 Apr 2017 22:24:49 +0300
Andy Shevchenko andy.shevchenko@gmail.com wrote:
...
>...and still a question "Do we go with stubs for them in case of !GPIOLIB?"

I've just sent a patch.

>Patch below looks good to me:

Thanks for review!

Anatolij
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On Thu, Apr 20, 2017 at 11:23 PM, Anatolij Gustschin <agust@denx.de> wrote:

> For hot-pluggable devices adding GPIOs dynamically we need to
> assemble and add the gpio lookup tables at probe time in modules,
> so that requesting these GPIOs in attached drivers can work.
> Export lookup table functions for modules.
>
> Signed-off-by: Anatolij Gustschin <agust@denx.de>

Patch applied with Andy's Review tag, sorry for missing it,
it was indeed sent to me I just randomly forgot the patch.

Yours,
Linus Walleij
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