pinctrl: nsp: Set irq handler based on trig type

Rather than always using handle_simple_irq() as the gpio_irq_chip
handler, set a more appropriate handler based on the IRQ trigger type
requested. This is important for level triggered interrupts which need
to be masked during handling. Also, fix the interrupt acknowledge so
that it clears only one interrupt instead of all interrupts which are
currently active. Finally there is no need to clear the interrupt during
the interrupt handler, since the edge-triggered handler will do that for
us.
Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Link: https://lore.kernel.org/r/20200703011830.15655-1-mark.tomlinson@alliedtelesis.co.nzSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/bcm/pinctrl-nsp-gpio.c

@@ -154,15 +154,9 @@ static irqreturn_t nsp_gpio_irq_handler(int irq, void *data)
 		level &= readl(chip->base + NSP_GPIO_INT_MASK);
 		int_bits = level | event;
 
-		for_each_set_bit(bit, &int_bits, gc->ngpio) {
-			/*
-			 * Clear the interrupt before invoking the
-			 * handler, so we do not leave any window
-			 */
-			writel(BIT(bit), chip->base + NSP_GPIO_EVENT);
+		for_each_set_bit(bit, &int_bits, gc->ngpio)
 			generic_handle_irq(
 				irq_linear_revmap(gc->irq.domain, bit));
-		}
 	}
 
 	return  int_bits ? IRQ_HANDLED : IRQ_NONE;
@@ -178,7 +172,7 @@ static void nsp_gpio_irq_ack(struct irq_data *d)
 
 	trigger_type = irq_get_trigger_type(d->irq);
 	if (trigger_type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
-		nsp_set_bit(chip, REG, NSP_GPIO_EVENT, gpio, val);
+		writel(val, chip->base + NSP_GPIO_EVENT);
 }
 
 /*
@@ -262,6 +256,12 @@ static int nsp_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 
 	nsp_set_bit(chip, REG, NSP_GPIO_EVENT_INT_POLARITY, gpio, falling);
 	nsp_set_bit(chip, REG, NSP_GPIO_INT_POLARITY, gpio, level_low);
+
+	if (type & IRQ_TYPE_EDGE_BOTH)
+		irq_set_handler_locked(d, handle_edge_irq);
+	else
+		irq_set_handler_locked(d, handle_level_irq);
+
 	raw_spin_unlock_irqrestore(&chip->lock, flags);
 
 	dev_dbg(chip->dev, "gpio:%u level_low:%s falling:%s\n", gpio,
@@ -691,7 +691,7 @@ static int nsp_gpio_probe(struct platform_device *pdev)
 		girq->num_parents = 0;
 		girq->parents = NULL;
 		girq->default_type = IRQ_TYPE_NONE;
-		girq->handler = handle_simple_irq;
+		girq->handler = handle_bad_irq;
 	}
 
 	ret = devm_gpiochip_add_data(dev, gc, chip);