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authorGuenter Roeck <linux@roeck-us.net>2014-06-17 15:51:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-31 12:44:09 -0700
commit2289889950b54f6b6aa035a289ba41a53198a053 (patch)
tree7998aa685666868d8cee49903d561f84a5d9a82e
parentca4303bc519bca7ddaa7c55036aaf4d50c19a573 (diff)
platform_get_irq: Revert to platform_get_resource if of_irq_get fails
commit aff008ad813c7cf3cfe7b532e7ba2c526c136f22 upstream. Commits 9ec36ca (of/irq: do irq resolution in platform_get_irq) and ad69674 (of/irq: do irq resolution in platform_get_irq_byname) change the semantics of platform_get_irq and platform_get_irq_byname to always rely on devicetree information if devicetree is enabled and if a devicetree node is attached to the device. The functions now return an error if the devicetree data does not include interrupt information, even if the information is available as platform resource data. This causes mfd client drivers to fail if the interrupt number is passed via platform resources. Therefore, if of_irq_get fails, try platform_get_resource as method of last resort. This restores the original functionality for drivers depending on platform resources to get irq information. Cc: Russell King <linux@arm.linux.org.uk> Cc: Tony Lindgren <tony@atomide.com> Cc: Grant Likely <grant.likely@linaro.org> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Rob Herring <robh@kernel.org> [ Guenter Roeck: backported to 3.15 ] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
-rw-r--r--drivers/base/platform.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 5b47210889e0..cd2a7d0a56b2 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -89,8 +89,13 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
return dev->archdata.irqs[num];
#else
struct resource *r;
- if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node)
- return of_irq_get(dev->dev.of_node, num);
+ if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
+ int ret;
+
+ ret = of_irq_get(dev->dev.of_node, num);
+ if (ret >= 0 || ret == -EPROBE_DEFER)
+ return ret;
+ }
r = platform_get_resource(dev, IORESOURCE_IRQ, num);