linux-kernel - [PATCH V2] gpio: mxc: Only getting second IRQ when there is more than one IRQ

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Message-Id: <1568885957-2968-1-git-send-email-Anson.Huang@nxp.com>
Date:   Thu, 19 Sep 2019 17:39:17 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH V2] gpio: mxc: Only getting second IRQ when there is more than one IRQ

On some of i.MX SoCs like i.MX8QXP, there is ONLY one IRQ for each
GPIO bank, so it is better to check the IRQ count before getting
second IRQ to avoid below error message during probe:

[    1.070908] gpio-mxc 5d080000.gpio: IRQ index 1 not found
[    1.077420] gpio-mxc 5d090000.gpio: IRQ index 1 not found
[    1.083766] gpio-mxc 5d0a0000.gpio: IRQ index 1 not found
[    1.090122] gpio-mxc 5d0b0000.gpio: IRQ index 1 not found
[    1.096470] gpio-mxc 5d0c0000.gpio: IRQ index 1 not found
[    1.102804] gpio-mxc 5d0d0000.gpio: IRQ index 1 not found
[    1.109144] gpio-mxc 5d0e0000.gpio: IRQ index 1 not found
[    1.115475] gpio-mxc 5d0f0000.gpio: IRQ index 1 not found

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
Changes since V1:
	- use local variable irq_count instead or err to avoid confusion.
---
 drivers/gpio/gpio-mxc.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 7907a87..c77d474 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -411,6 +411,7 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct mxc_gpio_port *port;
+	int irq_count;
 	int irq_base;
 	int err;
 
@@ -426,9 +427,15 @@ static int mxc_gpio_probe(struct platform_device *pdev)
 	if (IS_ERR(port->base))
 		return PTR_ERR(port->base);
 
-	port->irq_high = platform_get_irq(pdev, 1);
-	if (port->irq_high < 0)
-		port->irq_high = 0;
+	irq_count = platform_irq_count(pdev);
+	if (irq_count < 0)
+		return irq_count;
+
+	if (irq_count > 1) {
+		port->irq_high = platform_get_irq(pdev, 1);
+		if (port->irq_high < 0)
+			port->irq_high = 0;
+	}
 
 	port->irq = platform_get_irq(pdev, 0);
 	if (port->irq < 0)
-- 
2.7.4