lib: sbi_irqchip: Allow registering interrupt handlers

To handle external interrupts in M-mode, the sbi_irqchip framework
must allow registering interrupt handlers from device drivers.

Signed-off-by: Anup Patel <anup.patel@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260213055342.3124872-9-anup.patel@oss.qualcomm.com
Signed-off-by: Anup Patel <anup@brainfault.org>

lib/utils/irqchip/plic.c

@@ -281,6 +281,7 @@ int plic_cold_irqchip_init(struct plic_data *plic)
 
 	/* Register irqchip device */
 	plic->irqchip.id = plic->unique_id;
+	plic->irqchip.num_hwirq = plic->num_src + 1;
 	plic->irqchip.warm_init = plic_warm_irqchip_init;
 	return sbi_irqchip_add_device(&plic->irqchip);
 }