gpio: mt7621: 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.  Following this change the following warnings
are now observed for the mt7621 driver:

gpio gpiochip0: (1e000600.gpio-bank0): not an immutable chip, please consider fixing it!
gpio gpiochip1: (1e000600.gpio-bank1): not an immutable chip, please consider fixing it!
gpio gpiochip2: (1e000600.gpio-bank2): not an immutable chip, please consider fixing it!

Fix this by making the irqchip in the mt7621 driver immutable.

Tested-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
index d8a26e503ca5d2fe7d99ce2745b484520a2973c0..f163f5ca857beb24d7c3eafffef482a6bb9def6b 100644 (file)
--- a/drivers/gpio/gpio-mt7621.c
+++ b/drivers/gpio/gpio-mt7621.c
@@ -112,6 +112,8 @@ mediatek_gpio_irq_unmask(struct irq_data *d)
        unsigned long flags;
        u32 rise, fall, high, low;
 
+       gpiochip_enable_irq(gc, d->hwirq);
+
        spin_lock_irqsave(&rg->lock, flags);
        rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
        fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
@@ -143,6 +145,8 @@ mediatek_gpio_irq_mask(struct irq_data *d)
        mtk_gpio_w32(rg, GPIO_REG_HLVL, high & ~BIT(pin));
        mtk_gpio_w32(rg, GPIO_REG_LLVL, low & ~BIT(pin));
        spin_unlock_irqrestore(&rg->lock, flags);
+
+       gpiochip_disable_irq(gc, d->hwirq);
 }
 
 static int
@@ -204,6 +208,16 @@ mediatek_gpio_xlate(struct gpio_chip *chip,
        return gpio % MTK_BANK_WIDTH;
 }
 
+static const struct irq_chip mt7621_irq_chip = {
+       .name           = "mt7621-gpio",
+       .irq_mask_ack   = mediatek_gpio_irq_mask,
+       .irq_mask       = mediatek_gpio_irq_mask,
+       .irq_unmask     = mediatek_gpio_irq_unmask,
+       .irq_set_type   = mediatek_gpio_irq_type,
+       .flags          = IRQCHIP_IMMUTABLE,
+       GPIOCHIP_IRQ_RESOURCE_HELPERS,
+};
+
 static int
 mediatek_gpio_bank_probe(struct device *dev, int bank)
 {
@@ -238,11 +252,6 @@ mediatek_gpio_bank_probe(struct device *dev, int bank)
                return -ENOMEM;
 
        rg->chip.offset = bank * MTK_BANK_WIDTH;
-       rg->irq_chip.name = dev_name(dev);
-       rg->irq_chip.irq_unmask = mediatek_gpio_irq_unmask;
-       rg->irq_chip.irq_mask = mediatek_gpio_irq_mask;
-       rg->irq_chip.irq_mask_ack = mediatek_gpio_irq_mask;
-       rg->irq_chip.irq_set_type = mediatek_gpio_irq_type;
 
        if (mtk->gpio_irq) {
                struct gpio_irq_chip *girq;
@@ -262,7 +271,7 @@ mediatek_gpio_bank_probe(struct device *dev, int bank)
                }
 
                girq = &rg->chip.irq;
-               girq->chip = &rg->irq_chip;
+               gpio_irq_chip_set_chip(girq, &mt7621_irq_chip);
                /* This will let us handle the parent IRQ in the driver */
                girq->parent_handler = NULL;
                girq->num_parents = 0;