[3.13.y.z extended stable] Patch "of/irq: do irq resolution in platform_get_irq_byname()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    of/irq: do irq resolution in platform_get_irq_byname()

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.6.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From f07b99b036382bdf68b3d5d7d065a3b7e1b6193b Mon Sep 17 00:00:00 2001
From: Grygorii Strashko <grygorii.strashko at ti.com>
Date: Tue, 20 May 2014 13:42:02 +0300
Subject: of/irq: do irq resolution in platform_get_irq_byname()

commit ad69674e73a18dc3a8da557f4059ccf9389531a5 upstream.

The commit 9ec36cafe43bf835f8f29273597a5b0cbc8267ef
"of/irq: do irq resolution in platform_get_irq" from Rob Herring -
moves resolving of the interrupt resources in platform_get_irq().
But this solution isn't complete because platform_get_irq_byname()
need to be modified the same way.

Hence, fix it by adding interrupt resolution code at the
platform_get_irq_byname() function too.

Cc: Russell King <linux at arm.linux.org.uk>
Cc: Rob Herring <robh at kernel.org>
Cc: Tony Lindgren <tony at atomide.com>
Cc: Grant Likely <grant.likely at linaro.org>
Cc: Thierry Reding <thierry.reding at gmail.com>

Signed-off-by: Grygorii Strashko <grygorii.strashko at ti.com>
Signed-off-by: Grant Likely <grant.likely at linaro.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/base/platform.c |  7 +++++--
 drivers/of/irq.c        | 22 ++++++++++++++++++++++
 include/linux/of_irq.h  |  5 +++++
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 39d2f6b..0d13679 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -131,9 +131,12 @@ EXPORT_SYMBOL_GPL(platform_get_resource_byname);
  */
 int platform_get_irq_byname(struct platform_device *dev, const char *name)
 {
-	struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
-							  name);
+	struct resource *r;
+
+	if (IS_ENABLED(CONFIG_OF_IRQ) && dev->dev.of_node)
+		return of_irq_get_byname(dev->dev.of_node, name);

+	r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
 	return r ? r->start : -ENXIO;
 }
 EXPORT_SYMBOL_GPL(platform_get_irq_byname);
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 11c7f73..5d8c346 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -403,6 +403,28 @@ int of_irq_get(struct device_node *dev, int index)
 }

 /**
+ * of_irq_get_byname - Decode a node's IRQ and return it as a Linux irq number
+ * @dev: pointer to device tree node
+ * @name: irq name
+ *
+ * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
+ * is not yet created, or error code in case of any other failure.
+ */
+int of_irq_get_byname(struct device_node *dev, const char *name)
+{
+	int index;
+
+	if (unlikely(!name))
+		return -EINVAL;
+
+	index = of_property_match_string(dev, "interrupt-names", name);
+	if (index < 0)
+		return index;
+
+	return of_irq_get(dev, index);
+}
+
+/**
  * of_irq_count - Count the number of IRQs a node uses
  * @dev: pointer to device tree node
  */
diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h
index 6404253..bfec136 100644
--- a/include/linux/of_irq.h
+++ b/include/linux/of_irq.h
@@ -45,6 +45,7 @@ extern void of_irq_init(const struct of_device_id *matches);
 #ifdef CONFIG_OF_IRQ
 extern int of_irq_count(struct device_node *dev);
 extern int of_irq_get(struct device_node *dev, int index);
+extern int of_irq_get_byname(struct device_node *dev, const char *name);
 #else
 static inline int of_irq_count(struct device_node *dev)
 {
@@ -54,6 +55,10 @@ static inline int of_irq_get(struct device_node *dev, int index)
 {
 	return 0;
 }
+static inline int of_irq_get_byname(struct device_node *dev, const char *name)
+{
+	return 0;
+}
 #endif

 #if defined(CONFIG_OF)
--
1.9.1