This is a note to let you know that I've just added the patch titled
platform_get_irq: Revert to platform_get_resource if of_irq_get fails
to my driver-core git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git
in the driver-core-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From aff008ad813c7cf3cfe7b532e7ba2c526c136f22 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <li...@roeck-us.net>
Date: Tue, 17 Jun 2014 15:51:02 -0700
Subject: platform_get_irq: Revert to platform_get_resource if of_irq_get fails
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 <li...@arm.linux.org.uk>
Cc: Tony Lindgren <t...@atomide.com>
Cc: Grant Likely <grant.lik...@linaro.org>
Cc: Grygorii Strashko <grygorii.stras...@ti.com>
Signed-off-by: Guenter Roeck <li...@roeck-us.net>
Acked-by: Rob Herring <r...@kernel.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/base/platform.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 9e9227e1762d..eee48c49f5de 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);
@@ -133,8 +138,13 @@ int platform_get_irq_byname(struct platform_device *dev,
const char *name)
{
struct resource *r;
- if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node)
- return of_irq_get_byname(dev->dev.of_node, name);
+ if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node) {
+ int ret;
+
+ ret = of_irq_get_byname(dev->dev.of_node, name);
+ if (ret >= 0 || ret == -EPROBE_DEFER)
+ return ret;
+ }
r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
return r ? r->start : -ENXIO;
--
2.0.0.254.g50f84e3
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