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Subject[tip:irq/core] irq/generic-chip: Provide devm_irq_alloc_generic_chip()
Commit-ID:  1c3e36309fe2e94b8a889fa32cb5c871434f8ed6
Gitweb: http://git.kernel.org/tip/1c3e36309fe2e94b8a889fa32cb5c871434f8ed6
Author: Bartosz Golaszewski <brgl@bgdev.pl>
AuthorDate: Wed, 31 May 2017 18:06:59 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Wed, 21 Jun 2017 15:53:11 +0200

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

---
Documentation/driver-model/devres.txt | 1 +
include/linux/irq.h | 5 +++++
kernel/irq/devres.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 40 insertions(+)

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index e72587f..d473be8 100644
--- 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 dc63aa1..64ae546 100644
--- 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 1613bfd..21ee0ae 100644
--- 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 */
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