irqchip/brcmstb-l2: Set controller as wake-up source

Utilize the Broadcom interrupt controller standard property
"brcm,irq-can-wake" to flag whether this particular interrupt controller
instance is wake-up capable.

Since we do not know what type of parent interrupt controller we are
interfaced with, ensure that enable_irq_wake() is called early on.

Signed-off-by: Justin Chen <[email protected]>
Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Ryceancurry

drivers/irqchip/irq-brcmstb-l2.c

@@ -254,6 +254,7 @@ static int __init brcmstb_l2_intc_of_init(struct device_node *np,
 		 */
 		data->gc->wake_enabled = 0xffffffff;
 		ct->chip.irq_set_wake = irq_gc_set_wake;
+		enable_irq_wake(parent_irq);
 	}
 
 	pr_info("registered L2 intc (%pOF, parent irq: %d)\n", np, parent_irq);