[SRU][N:linux-bluefield][PATCH v1 1/1] gpio: mlxbf3: only get IRQ for device instance 0

[David Thompson]

BugLink: https://bugs.launchpad.net/bugs/2115531

The gpio-mlxbf3 driver interfaces with two GPIO controllers,
device instance 0 and 1. There is a single IRQ resource shared
between the two controllers, and it is found in the ACPI table for
device instance 0.  The driver should not attempt to get an IRQ
resource when probing device instance 1, otherwise the following
error is logged:
  mlxbf3_gpio MLNXBF33:01: error -ENXIO: IRQ index 0 not found

Signed-off-by: David Thompson <davthompson at nvidia.com>
Reviewed-by: Shravan Kumar Ramani <shravankr at nvidia.com>
Fixes: cd33f216d241 ("gpio: mlxbf3: Add gpio driver support")
Link: https://lore.kernel.org/r/20250613163443.1065217-1-davthompson@nvidia.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski at linaro.org>
(cherry picked from commit 10af0273a35ab4513ca1546644b8c853044da134)
Signed-off-by: David Thompson <davthompson at nvidia.com>
---
 drivers/gpio/gpio-mlxbf3.c | 54 ++++++++++++++++++++++++--------------
 1 file changed, 35 insertions(+), 19 deletions(-)

diff --git a/drivers/gpio/gpio-mlxbf3.c b/drivers/gpio/gpio-mlxbf3.c
index 10ea71273c89..9875e34bde72 100644
--- a/drivers/gpio/gpio-mlxbf3.c
+++ b/drivers/gpio/gpio-mlxbf3.c
@@ -190,7 +190,9 @@ static int mlxbf3_gpio_probe(struct platform_device *pdev)
 	struct mlxbf3_gpio_context *gs;
 	struct gpio_irq_chip *girq;
 	struct gpio_chip *gc;
+	char *colon_ptr;
 	int ret, irq;
+	long num;
 
 	gs = devm_kzalloc(dev, sizeof(*gs), GFP_KERNEL);
 	if (!gs)
@@ -227,25 +229,39 @@ static int mlxbf3_gpio_probe(struct platform_device *pdev)
 	gc->owner = THIS_MODULE;
 	gc->add_pin_ranges = mlxbf3_gpio_add_pin_ranges;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq >= 0) {
-		girq = &gs->gc.irq;
-		gpio_irq_chip_set_chip(girq, &gpio_mlxbf3_irqchip);
-		girq->default_type = IRQ_TYPE_NONE;
-		/* This will let us handle the parent IRQ in the driver */
-		girq->num_parents = 0;
-		girq->parents = NULL;
-		girq->parent_handler = NULL;
-		girq->handler = handle_bad_irq;
-
-		/*
-		 * Directly request the irq here instead of passing
-		 * a flow-handler because the irq is shared.
-		 */
-		ret = devm_request_irq(dev, irq, mlxbf3_gpio_irq_handler,
-				       IRQF_SHARED, dev_name(dev), gs);
-		if (ret)
-			return dev_err_probe(dev, ret, "failed to request IRQ");
+	colon_ptr = strchr(dev_name(dev), ':');
+	if (!colon_ptr) {
+		dev_err(dev, "invalid device name format\n");
+		return -EINVAL;
+	}
+
+	ret = kstrtol(++colon_ptr, 16, &num);
+	if (ret) {
+		dev_err(dev, "invalid device instance\n");
+		return ret;
+	}
+
+	if (!num) {
+		irq = platform_get_irq(pdev, 0);
+		if (irq >= 0) {
+			girq = &gs->gc.irq;
+			gpio_irq_chip_set_chip(girq, &gpio_mlxbf3_irqchip);
+			girq->default_type = IRQ_TYPE_NONE;
+			/* This will let us handle the parent IRQ in the driver */
+			girq->num_parents = 0;
+			girq->parents = NULL;
+			girq->parent_handler = NULL;
+			girq->handler = handle_bad_irq;
+
+			/*
+			 * Directly request the irq here instead of passing
+			 * a flow-handler because the irq is shared.
+			 */
+			ret = devm_request_irq(dev, irq, mlxbf3_gpio_irq_handler,
+					       IRQF_SHARED, dev_name(dev), gs);
+			if (ret)
+				return dev_err_probe(dev, ret, "failed to request IRQ");
+		}
 	}
 
 	platform_set_drvdata(pdev, gs);
-- 
2.43.2