openwrt/target/linux/bcm27xx/patches-5.4/950-0618-i2c-brcmstb-The-interrupt-line-is-optional-so-use-pl.patch

From 8aa48c2a3fa470d348104e8f8aa558a661b724e5 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Tue, 31 Mar 2020 16:23:11 +0100
Subject: [PATCH] i2c: brcmstb: The interrupt line is optional, so use
 platform_get_irq_optional

If there is no interrupt defined then an error is logged due
to the use of platform_get_irq. The driver handles not having
the interrupt by falling back to polling, therefore make
the appropriate call when claiming it.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/i2c/busses/i2c-brcmstb.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

--- a/drivers/i2c/busses/i2c-brcmstb.c
+++ b/drivers/i2c/busses/i2c-brcmstb.c
@@ -647,20 +647,22 @@ static int brcmstb_i2c_probe(struct plat
 		int_name = NULL;
 
 	/* Get the interrupt number */
-	dev->irq = platform_get_irq(pdev, 0);
+	dev->irq = platform_get_irq_optional(pdev, 0);
 
 	/* disable the bsc interrupt line */
 	brcmstb_i2c_enable_disable_irq(dev, INT_DISABLE);
 
 	/* register the ISR handler */
-	rc = devm_request_irq(&pdev->dev, dev->irq, brcmstb_i2c_isr,
-			      IRQF_SHARED,
-			      int_name ? int_name : pdev->name,
-			      dev);
+	if (dev->irq >= 0) {
+		rc = devm_request_irq(&pdev->dev, dev->irq, brcmstb_i2c_isr,
+				      IRQF_SHARED,
+				      int_name ? int_name : pdev->name,
+				      dev);
 
-	if (rc) {
-		dev_dbg(dev->device, "falling back to polling mode");
-		dev->irq = -1;
+		if (rc) {
+			dev_dbg(dev->device, "falling back to polling mode");
+			dev->irq = -1;
+		}
 	}
 
 	if (of_property_read_u32(dev->device->of_node,