[PATCH] gpio: mpfs: 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 gpio-mpfs driver:

    gpio gpiochip0: (20122000.gpio): not an immutable chip, please consider fixing it!

Fix this by making the irqchip in the gpio-mpfs driver immutable.

While at it, drop of the unneeded masking of the hwirq number, as it is
always smaller than the number of GPIOs/interrupts handled by the
controller.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
Not tested with interrupts, as there are no inputs described in the
Icicle DTS yet.
---
 drivers/gpio/gpio-mpfs.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-mpfs.c b/drivers/gpio/gpio-mpfs.c
index 168be0b90cf8c656..fd294b581ae77369 100644
--- a/drivers/gpio/gpio-mpfs.c
+++ b/drivers/gpio/gpio-mpfs.c
@@ -168,8 +168,9 @@ static void mpfs_gpio_irq_unmask(struct irq_data *data)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
 	struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
-	int gpio_index = irqd_to_hwirq(data) % MAX_NUM_GPIO;
+	int gpio_index = irqd_to_hwirq(data);
 
+	gpiochip_enable_irq(gc, gpio_index);
 	mpfs_gpio_direction_input(gc, gpio_index);
 	mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, gpio_index, 1);
 	mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_GPIO_CTRL(gpio_index),
@@ -180,11 +181,12 @@ static void mpfs_gpio_irq_mask(struct irq_data *data)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
 	struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
-	int gpio_index = irqd_to_hwirq(data) % MAX_NUM_GPIO;
+	int gpio_index = irqd_to_hwirq(data);
 
 	mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_IRQ_REG, gpio_index, 1);
 	mpfs_gpio_assign_bit(mpfs_gpio->base + MPFS_GPIO_CTRL(gpio_index),
 			     MPFS_GPIO_EN_INT, 0);
+	gpiochip_disable_irq(gc, gpio_index);
 }
 
 static const struct irq_chip mpfs_gpio_irqchip = {
@@ -192,7 +194,8 @@ static const struct irq_chip mpfs_gpio_irqchip = {
 	.irq_set_type = mpfs_gpio_irq_set_type,
 	.irq_mask	= mpfs_gpio_irq_mask,
 	.irq_unmask	= mpfs_gpio_irq_unmask,
-	.flags = IRQCHIP_MASK_ON_SUSPEND,
+	.flags = IRQCHIP_IMMUTABLE | IRQCHIP_MASK_ON_SUSPEND,
+	GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static void mpfs_gpio_irq_handler(struct irq_desc *desc)
-- 
2.25.1