[PATCH v2 2/4] gpio: sifive: Look up IRQs only once during probe

[Samuel Holland]

of_irq_count(), or eqivalently platform_irq_count(), simply looks up
successively-numbered IRQs until that fails. Since this driver needs to
look up each IRQ anyway to get its virq number, use that existing loop
to count the IRQs at the same time.

Signed-off-by: Samuel Holland <samuel.holland at sifive.com>
---

Changes in v2:
 - New patch for v2

 drivers/gpio/gpio-sifive.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/gpio/gpio-sifive.c b/drivers/gpio/gpio-sifive.c
index ab32c952c61b..6606c919d957 100644
--- a/drivers/gpio/gpio-sifive.c
+++ b/drivers/gpio/gpio-sifive.c
@@ -185,7 +185,7 @@ static int sifive_gpio_probe(struct platform_device *pdev)
 	struct irq_domain *parent;
 	struct gpio_irq_chip *girq;
 	struct sifive_gpio *chip;
-	int ret, ngpio, i;
+	int ret, ngpio;
 
 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
@@ -202,13 +202,6 @@ static int sifive_gpio_probe(struct platform_device *pdev)
 	if (IS_ERR(chip->regs))
 		return PTR_ERR(chip->regs);
 
-	ngpio = of_irq_count(node);
-	if (ngpio > SIFIVE_GPIO_MAX) {
-		dev_err(dev, "Too many GPIO interrupts (max=%d)\n",
-			SIFIVE_GPIO_MAX);
-		return -ENXIO;
-	}
-
 	irq_parent = of_irq_find_parent(node);
 	if (!irq_parent) {
 		dev_err(dev, "no IRQ parent node\n");
@@ -221,11 +214,11 @@ static int sifive_gpio_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	for (i = 0; i < ngpio; i++) {
-		ret = platform_get_irq(pdev, i);
+	for (ngpio = 0; ngpio < SIFIVE_GPIO_MAX; ngpio++) {
+		ret = platform_get_irq_optional(pdev, ngpio);
 		if (ret < 0)
-			return ret;
-		chip->irq_number[i] = ret;
+			break;
+		chip->irq_number[ngpio] = ret;
 	}
 
 	ret = bgpio_init(&chip->gc, dev, 4,
-- 
2.40.1