[PATCH RFC] pinctrl: bcm2835: Make the irqchip immutable

[Stefan Wahren <stefan.wahren@xxxxxxxx>]

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. The bcm2835 pinctrl is also affected by this
warning.

Fix this by making the irqchip in the bcm2835 pinctrl driver immutable.

Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
---

Hi, not sure about this change because irq_mask/unmask also uses the
enable/disable callbacks.

 drivers/pinctrl/bcm/pinctrl-bcm2835.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index dad453054776..f754f7ed9eb9 100644
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -516,6 +516,8 @@ static void bcm2835_gpio_irq_enable(struct irq_data *data)
 	unsigned bank = GPIO_REG_OFFSET(gpio);
 	unsigned long flags;
 
+	gpiochip_enable_irq(chip, gpio);
+
 	raw_spin_lock_irqsave(&pc->irq_lock[bank], flags);
 	set_bit(offset, &pc->enabled_irq_map[bank]);
 	bcm2835_gpio_irq_config(pc, gpio, true);
@@ -537,6 +539,8 @@ static void bcm2835_gpio_irq_disable(struct irq_data *data)
 	bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
 	clear_bit(offset, &pc->enabled_irq_map[bank]);
 	raw_spin_unlock_irqrestore(&pc->irq_lock[bank], flags);
+
+	gpiochip_disable_irq(chip, gpio);
 }
 
 static int __bcm2835_gpio_irq_set_type_disabled(struct bcm2835_pinctrl *pc,
@@ -693,7 +697,7 @@ static int bcm2835_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
 	return ret;
 }
 
-static struct irq_chip bcm2835_gpio_irq_chip = {
+static const struct irq_chip bcm2835_gpio_irq_chip = {
 	.name = MODULE_NAME,
 	.irq_enable = bcm2835_gpio_irq_enable,
 	.irq_disable = bcm2835_gpio_irq_disable,
@@ -702,7 +706,7 @@ static struct irq_chip bcm2835_gpio_irq_chip = {
 	.irq_mask = bcm2835_gpio_irq_disable,
 	.irq_unmask = bcm2835_gpio_irq_enable,
 	.irq_set_wake = bcm2835_gpio_irq_set_wake,
-	.flags = IRQCHIP_MASK_ON_SUSPEND,
+	.flags = (IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE),
 };
 
 static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
@@ -1280,7 +1284,7 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
 	pinctrl_add_gpio_range(pc->pctl_dev, &pc->gpio_range);
 
 	girq = &pc->gpio_chip.irq;
-	girq->chip = &bcm2835_gpio_irq_chip;
+	gpio_irq_chip_set_chip(girq, &bcm2835_gpio_irq_chip);
 	girq->parent_handler = bcm2835_gpio_irq_handler;
 	girq->num_parents = BCM2835_NUM_IRQS;
 	girq->parents = devm_kcalloc(dev, BCM2835_NUM_IRQS,
-- 
2.25.1