[PATCH 1/2] RFT: gpio: sifive: Set affinity callback to parent

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

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.

Cc: Yash Shah <yash.shah@xxxxxxxxxx>
Cc: Wesley W. Terpstra <wesley@xxxxxxxxxx>
Suggested-by: Marc Zyngier <maz@xxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/gpio/gpio-sifive.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
index c54dd08f2cbf..e4c190562132 100644
--- a/drivers/gpio/gpio-sifive.c
+++ b/drivers/gpio/gpio-sifive.c
@@ -128,6 +128,16 @@ static void sifive_gpio_irq_eoi(struct irq_data *d)
 	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 0;
+}
+
 static struct irq_chip sifive_gpio_irqchip = {
 	.name		= "sifive-gpio",
 	.irq_set_type	= sifive_gpio_irq_set_type,
@@ -136,6 +146,7 @@ static struct irq_chip sifive_gpio_irqchip = {
 	.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,
-- 
2.26.2