gpio: sifive: Set affinity callback to parent

This assigns the .irq_set_affinity to the parent callback.
I assume the sifive GPIO can be used in systems with
SMP.

I used the pattern making the hirerarchy tolerant for missing
parent as in Marc's earlier patches.

Suggested-by: Marc Zyngier <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Cc: Yash Shah <[e-mail]>
Cc: Wesley W. Terpstra <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/gpio/gpio-sifive.c

···
 	irq_chip_eoi_parent(d);
 }
 
+static int sifive_gpio_irq_set_affinity(struct irq_data *data,
+					const struct cpumask *dest,
+					bool force)
+{
+	if (data->parent_data)
+		return irq_chip_set_affinity_parent(data, dest, force);
+
+	return -EINVAL;
+}
+
 static struct irq_chip sifive_gpio_irqchip = {
 	.name		= "sifive-gpio",
 	.irq_set_type	= sifive_gpio_irq_set_type,
···
 	.irq_enable	= sifive_gpio_irq_enable,
 	.irq_disable	= sifive_gpio_irq_disable,
 	.irq_eoi	= sifive_gpio_irq_eoi,
+	.irq_set_affinity = sifive_gpio_irq_set_affinity,
 };
 
 static int sifive_gpio_child_to_parent_hwirq(struct gpio_chip *gc,