irq/generic-chip: Provide devm_irq_alloc_generic_chip()

Provide a resource managed variant of irq_alloc_generic_chip().

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-doc@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Link: http://lkml.kernel.org/r/1496246820-13250-5-git-send-email-brgl@bgdev.pl

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index e72587fe477d5f1ad958e9810f1e5c46cbccc786..d473be8c878172ea665e84890067a57a90147a6c 100644 (file)
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -311,6 +311,7 @@ IRQ
   devm_irq_alloc_desc_at()
   devm_irq_alloc_desc_from()
   devm_irq_alloc_descs_from()
+  devm_irq_alloc_generic_chip()
 
 LED
   devm_led_classdev_register()

diff --git a/include/linux/irq.h b/include/linux/irq.h
index dc63aa10ce708ccab760c1c8cdb01693fdce6597..64ae54673e080f7f6d68607781679996b7bb1d61 100644 (file)
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -958,6 +958,11 @@ int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
 void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
                             unsigned int clr, unsigned int set);
 
+struct irq_chip_generic *
+devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
+                           unsigned int irq_base, void __iomem *reg_base,
+                           irq_flow_handler_t handler);
+
 struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq);
 
 int __irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,

diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index 1613bfd483657ceea438362c1f0c6eb69823785e..21ee0aebccfb3fe1c7f8975caa2b9d50a2993050 100644 (file)
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -4,6 +4,8 @@
 #include <linux/gfp.h>
 #include <linux/irq.h>
 
+#include "internals.h"
+
 /*
  * Device resource management aware IRQ request/free implementation.
  */
@@ -198,3 +200,35 @@ int __devm_irq_alloc_descs(struct device *dev, int irq, unsigned int from,
        return base;
 }
 EXPORT_SYMBOL_GPL(__devm_irq_alloc_descs);
+
+#ifdef CONFIG_GENERIC_IRQ_CHIP
+/**
+ * devm_irq_alloc_generic_chip - Allocate and initialize a generic chip
+ *                               for a managed device
+ * @dev:       Device to allocate the generic chip for
+ * @name:      Name of the irq chip
+ * @num_ct:    Number of irq_chip_type instances associated with this
+ * @irq_base:  Interrupt base nr for this chip
+ * @reg_base:  Register base address (virtual)
+ * @handler:   Default flow handler associated with this chip
+ *
+ * Returns an initialized irq_chip_generic structure. The chip defaults
+ * to the primary (index 0) irq_chip_type and @handler
+ */
+struct irq_chip_generic *
+devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
+                           unsigned int irq_base, void __iomem *reg_base,
+                           irq_flow_handler_t handler)
+{
+       struct irq_chip_generic *gc;
+       unsigned long sz = sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);
+
+       gc = devm_kzalloc(dev, sz, GFP_KERNEL);
+       if (gc)
+               irq_init_generic_chip(gc, name, num_ct,
+                                     irq_base, reg_base, handler);
+
+       return gc;
+}
+EXPORT_SYMBOL_GPL(devm_irq_alloc_generic_chip);
+#endif /* CONFIG_GENERIC_IRQ_CHIP */