irqchip/ocelot: Comment sticky register clearing code

Add comment to the sticky register clearing code.

Signed-off-by: Sergey Matsievskiy <matsievskiysv@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20240925184416.54204-3-matsievskiysv@gmail.com

drivers/irqchip/irq-mscc-ocelot.c

@@ -84,6 +84,12 @@ static void ocelot_irq_unmask(struct irq_data *data)
 	u32 val;
 
 	irq_gc_lock(gc);
+	/*
+	 * Clear sticky bits for edge mode interrupts.
+	 * Serval has only one trigger register replication, but the adjacent
+	 * register is always read as zero, so there's no need to handle this
+	 * case separately.
+	 */
 	val = irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(p, 0)) |
 		irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(p, 1));
 	if (!(val & mask))