[PATCH] gpio: sifive: Make the irqchip immutable

[Geert Uytterhoeven <geert+renesas@xxxxxxxxx>]

Commit 6c846d026d49 ("gpio: Don't fiddle with irqchips marked as
immutable") added a warning to indicate if the gpiolib is altering the
internals of irqchips.  Following this change the following warning is
now observed for the sifive driver:

    gpio gpiochip1: (38001000.gpio-controller): not an immutable chip, please consider fixing it!

Fix this by making the irqchip in the sifive driver immutable.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
Against linux-next.
Boot-tested on SiPEED MAiXBiT (Canaan K210).
---
 drivers/gpio/gpio-sifive.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
index 03b8c4de2e91e3c4..a48f62780e099040 100644
--- a/drivers/gpio/gpio-sifive.c
+++ b/drivers/gpio/gpio-sifive.c
@@ -79,6 +79,7 @@ static void sifive_gpio_irq_enable(struct irq_data *d)
 	u32 bit = BIT(offset);
 	unsigned long flags;
 
+	gpiochip_enable_irq(gc, d->hwirq);
 	irq_chip_enable_parent(d);
 
 	/* Switch to input */
@@ -106,6 +107,7 @@ static void sifive_gpio_irq_disable(struct irq_data *d)
 	assign_bit(offset, &chip->irq_state, 0);
 	sifive_gpio_set_ie(chip, offset);
 	irq_chip_disable_parent(d);
+	gpiochip_disable_irq(gc, d->hwirq);
 }
 
 static void sifive_gpio_irq_eoi(struct irq_data *d)
@@ -137,7 +139,7 @@ static int sifive_gpio_irq_set_affinity(struct irq_data *data,
 	return -EINVAL;
 }
 
-static struct irq_chip sifive_gpio_irqchip = {
+static const struct irq_chip sifive_gpio_irqchip = {
 	.name		= "sifive-gpio",
 	.irq_set_type	= sifive_gpio_irq_set_type,
 	.irq_mask	= irq_chip_mask_parent,
@@ -146,6 +148,8 @@ static struct irq_chip sifive_gpio_irqchip = {
 	.irq_disable	= sifive_gpio_irq_disable,
 	.irq_eoi	= sifive_gpio_irq_eoi,
 	.irq_set_affinity = sifive_gpio_irq_set_affinity,
+	.flags		= IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int sifive_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
@@ -242,7 +246,7 @@ static int sifive_gpio_probe(struct platform_device *pdev)
 	chip->gc.parent = dev;
 	chip->gc.owner = THIS_MODULE;
 	girq = &chip->gc.irq;
-	girq->chip = &sifive_gpio_irqchip;
+	gpio_irq_chip_set_chip(girq, &sifive_gpio_irqchip);
 	girq->fwnode = of_node_to_fwnode(node);
 	girq->parent_domain = parent;
 	girq->child_to_parent_hwirq = sifive_gpio_child_to_parent_hwirq;
-- 
2.25.1