irqchip/irq-bcm7038-l1: Switch to IRQCHIP_PLATFORM_DRIVER

Allow the user selection and building of this interrupt controller
driver as a module since it is used on ARM/ARM64 based systems as a
second level interrupt controller hanging off the ARM GIC and is
therefore loadable during boot.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211020184859.2705451-7-f.fainelli@gmail.com

drivers/irqchip/Kconfig

@@ -115,7 +115,9 @@ config BCM6345_L1_IRQ
 	select GENERIC_IRQ_EFFECTIVE_AFF_MASK
 
 config BCM7038_L1_IRQ
-	bool
+	tristate "Broadcom STB 7038-style L1/L2 interrupt controller driver"
+	depends on ARCH_BRCMSTB || BMIPS_GENERIC
+	default ARCH_BRCMSTB || BMIPS_GENERIC
 	select GENERIC_IRQ_CHIP
 	select IRQ_DOMAIN
 	select GENERIC_IRQ_EFFECTIVE_AFF_MASK

drivers/irqchip/irq-bcm7038-l1.c

@@ -455,4 +455,8 @@ static int __init bcm7038_l1_of_init(struct device_node *dn,
 	return ret;
 }
 
-IRQCHIP_DECLARE(bcm7038_l1, "brcm,bcm7038-l1-intc", bcm7038_l1_of_init);
+IRQCHIP_PLATFORM_DRIVER_BEGIN(bcm7038_l1)
+IRQCHIP_MATCH("brcm,bcm7038-l1-intc", bcm7038_l1_of_init)
+IRQCHIP_PLATFORM_DRIVER_END(bcm7038_l1)
+MODULE_DESCRIPTION("Broadcom STB 7038-style L1/L2 interrupt controller");
+MODULE_LICENSE("GPL v2");