ANDROID: irqchip/gic-v3-its: Export suspend and resume functions for S2IDLE

Although the suspend and resume functions exist and are registered as syscore_ops
in the upstream GICv3 ITS driver,
there is currently no proper way to invoke these functions in the S2IDLE scenario,
as the S2IDLE framework does not call syscore_ops.

To address this, export the suspend and resume symbols from the GICv3 ITS driver.
This allows vendor modules to hook these functions into the s2idle_ops callbacks,
enabling the save and restore of the GICv3 ITS state during S2IDLE.

Bug: 405256435
Signed-off-by: Youngmin Nam <youngmin.nam@samsung.com>
Change-Id: Ib91e722856d5034da771c73612b5ca9f002a3342

drivers/irqchip/irq-gic-v3-its.c

@@ -4883,7 +4883,7 @@ static void its_enable_quirks(struct its_node *its)
 				     its_quirks, its);
 }
 
-static int its_save_disable(void)
+int its_save_disable(void)
 {
 	struct its_node *its;
 	int err = 0;
@@ -4918,8 +4918,9 @@ err:
 
 	return err;
 }
+EXPORT_SYMBOL_GPL(its_save_disable);
 
-static void its_restore_enable(void)
+void its_restore_enable(void)
 {
 	struct its_node *its;
 	int ret;
@@ -4978,6 +4979,7 @@ static void its_restore_enable(void)
 	}
 	raw_spin_unlock(&its_lock);
 }
+EXPORT_SYMBOL_GPL(its_restore_enable);
 
 static struct syscore_ops its_syscore_ops = {
 	.suspend = its_save_disable,

include/linux/irqchip/arm-gic-v3.h

@@ -660,6 +660,9 @@ void gic_v3_dist_init(void);
 void gic_v3_cpu_init(void);
 void gic_v3_dist_wait_for_rwp(void);
 
+int its_save_disable(void);
+void its_restore_enable(void);
+
 #endif
 
 #endif