gpio: gpiolib: Allow free() callback to be overridden

Allow free() callback to be overridden from irq_domain_ops for
hierarchical chips.

This allows drivers to free up resources which are allocated during
child_to_parent_hwirq()/populate_parent_alloc_arg() callbacks.

On Renesas RZ/G2L platform a bitmap is maintained for TINT slots, a slot
is allocated in child_to_parent_hwirq() callback which is freed up in free
callback hence this override.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220707182314.66610-5-prabhakar.mahadev-lad.rj@bp.renesas.com

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bfde94243752c76f83fc10f3bfe42c3036bef929..68d9f95d7799acb3f4d3c856468952df213e8bcd 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1181,15 +1181,18 @@ static void gpiochip_hierarchy_setup_domain_ops(struct irq_domain_ops *ops)
        ops->activate = gpiochip_irq_domain_activate;
        ops->deactivate = gpiochip_irq_domain_deactivate;
        ops->alloc = gpiochip_hierarchy_irq_domain_alloc;
-       ops->free = irq_domain_free_irqs_common;
 
        /*
-        * We only allow overriding the translate() function for
+        * We only allow overriding the translate() and free() functions for
         * hierarchical chips, and this should only be done if the user
-        * really need something other than 1:1 translation.
+        * really need something other than 1:1 translation for translate()
+        * callback and free if user wants to free up any resources which
+        * were allocated during callbacks, for example populate_parent_alloc_arg.
         */
        if (!ops->translate)
                ops->translate = gpiochip_hierarchy_irq_domain_translate;
+       if (!ops->free)
+               ops->free = irq_domain_free_irqs_common;
 }
 
 static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc)