pinctrl: bcm2835: Make the irqchip immutable

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@i2se.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220614202831.236341-3-stefan.wahren@i2se.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index 807824bc9a102d1336b62d88fa0841e5074475a8..7857e612a10080ea04fd75ef45860a6c797b0984 100644 (file)
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -516,6 +516,8 @@ static void bcm2835_gpio_irq_unmask(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_mask(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,
@@ -693,14 +697,15 @@ 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_set_type = bcm2835_gpio_irq_set_type,
        .irq_ack = bcm2835_gpio_irq_ack,
        .irq_mask = bcm2835_gpio_irq_mask,
        .irq_unmask = bcm2835_gpio_irq_unmask,
        .irq_set_wake = bcm2835_gpio_irq_set_wake,
-       .flags = IRQCHIP_MASK_ON_SUSPEND,
+       .flags = (IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_IMMUTABLE),
+       GPIOCHIP_IRQ_RESOURCE_HELPERS,
 };
 
 static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
@@ -1278,7 +1283,7 @@ 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,