[PATCH v3 6/8] irqchip/stm32mp-exti: allow build as module

[Antonio Borneo <antonio.borneo@foss.st.com>]

Allow build the driver as a module by adding the necessarily hooks
in Kconfig and in the driver's code.

Since all the probe dependencies linked to this driver has already
been fixed, ignore the no more relevant 'arch_initcall'.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
---
 drivers/irqchip/Kconfig            |  8 ++++++--
 drivers/irqchip/irq-stm32mp-exti.c | 15 ++++-----------
 2 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 486022fb7806e..b804da28dccf5 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -393,9 +393,13 @@ config PARTITION_PERCPU
 	bool
 
 config STM32MP_EXTI
-	bool
-	select IRQ_DOMAIN
+	tristate "STM32MP extended interrupts and event controller"
+	depends on (ARCH_STM32 && !ARM_SINGLE_ARMV7M) || COMPILE_TEST
+	default y
+	select IRQ_DOMAIN_HIERARCHY
 	select GENERIC_IRQ_CHIP
+	help
+	  Support STM32MP EXTI (extended interrupts and event) controller.
 
 config STM32_EXTI
 	bool
diff --git a/drivers/irqchip/irq-stm32mp-exti.c b/drivers/irqchip/irq-stm32mp-exti.c
index 3ceff6d25b702..2958fbcfbda12 100644
--- a/drivers/irqchip/irq-stm32mp-exti.c
+++ b/drivers/irqchip/irq-stm32mp-exti.c
@@ -730,15 +730,8 @@ static struct platform_driver stm32mp_exti_driver = {
 	},
 };
 
-static int __init stm32mp_exti_arch_init(void)
-{
-	return platform_driver_register(&stm32mp_exti_driver);
-}
-
-static void __exit stm32mp_exti_arch_exit(void)
-{
-	return platform_driver_unregister(&stm32mp_exti_driver);
-}
+module_platform_driver(stm32mp_exti_driver);
 
-arch_initcall(stm32mp_exti_arch_init);
-module_exit(stm32mp_exti_arch_exit);
+MODULE_AUTHOR("Maxime Coquelin <mcoquelin.stm32@gmail.com>");
+MODULE_DESCRIPTION("STM32MP EXTI driver");
+MODULE_LICENSE("GPL");
-- 
2.34.1