[PATCH RFC 2/9] gpio: grgpio: Make irq_chip immutable

["Peng Fan (OSS)" <peng.fan@oss.nxp.com>]

From: Peng Fan <peng.fan@nxp.com>

Kernel warns about mutable irq_chips:
"not an immutable chip, please consider fixing!"

Constify grgpio_irq_chip, flag the irq_chip as IRQCHIP_IMMUTABLE, add the
new helper functions, and call the appropriate gpiolib functions.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 drivers/gpio/gpio-grgpio.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-grgpio.c b/drivers/gpio/gpio-grgpio.c
index 641df8f2fd3d3fc523acd5103cc77d50113599e5..d38a2d9854ca524f05164180601b1a936cc70983 100644
--- a/drivers/gpio/gpio-grgpio.c
+++ b/drivers/gpio/gpio-grgpio.c
@@ -170,6 +170,8 @@ static void grgpio_irq_mask(struct irq_data *d)
 	grgpio_set_imask(priv, offset, 0);
 
 	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
+
+	gpiochip_disable_irq(&priv->gc, d->hwirq);
 }
 
 static void grgpio_irq_unmask(struct irq_data *d)
@@ -178,6 +180,7 @@ static void grgpio_irq_unmask(struct irq_data *d)
 	int offset = d->hwirq;
 	unsigned long flags;
 
+	gpiochip_enable_irq(&priv->gc, d->hwirq);
 	raw_spin_lock_irqsave(&priv->gc.bgpio_lock, flags);
 
 	grgpio_set_imask(priv, offset, 1);
@@ -185,11 +188,13 @@ static void grgpio_irq_unmask(struct irq_data *d)
 	raw_spin_unlock_irqrestore(&priv->gc.bgpio_lock, flags);
 }
 
-static struct irq_chip grgpio_irq_chip = {
+static const struct irq_chip grgpio_irq_chip = {
 	.name			= "grgpio",
 	.irq_mask		= grgpio_irq_mask,
 	.irq_unmask		= grgpio_irq_unmask,
 	.irq_set_type		= grgpio_irq_set_type,
+	.flags = IRQCHIP_IMMUTABLE,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static irqreturn_t grgpio_irq_handler(int irq, void *dev)

-- 
2.37.1