Commit 7c6c57f2 authored by Marcin Wojtas's avatar Marcin Wojtas Committed by David S. Miller
Browse files

device property: Introduce fwnode_irq_get() 



Until now there were two very similar functions allowing
to get Linux IRQ number from ACPI handle (acpi_irq_get())
and OF node (of_irq_get()). The first one appeared to be used
only as a subroutine of platform_irq_get(), which (in the generic
code) limited IRQ obtaining from _CRS method only to nodes
associated to kernel's struct platform_device.

This patch introduces a new helper routine - fwnode_irq_get(),
which allows to get the IRQ number directly from the fwnode
to be used as common for OF/ACPI worlds. It is usable not
only for the parents fwnodes, but also for the child nodes
comprising their own _CRS methods with interrupts description.

In order to be able o satisfy compilation with !CONFIG_ACPI
and also simplify the new code, introduce a helper macro
(ACPI_HANDLE_FWNODE), with which it is possible to reach
an ACPI handle directly from its fwnode.

Signed-off-by: default avatarMarcin Wojtas <mw@semihalf.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b28f263b

drivers/base/property.c

+26 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_graph.h>

#include <linux/of_irq.h>

#include <linux/property.h>

#include <linux/etherdevice.h>

#include <linux/phy.h>
@@ -1229,6 +1230,31 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen) 
}

EXPORT_SYMBOL(device_get_mac_address);



/**

 * fwnode_irq_get - Get IRQ directly from a fwnode

 * @fwnode:	Pointer to the firmware node

 * @index:	Zero-based index of the IRQ

 *

 * Returns Linux IRQ number on success. Other values are determined

 * accordingly to acpi_/of_ irq_get() operation.

 */

int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index)

{

	struct device_node *of_node = to_of_node(fwnode);

	struct resource res;

	int ret;



	if (IS_ENABLED(CONFIG_OF) && of_node)

		return of_irq_get(of_node, index);



	ret = acpi_irq_get(ACPI_HANDLE_FWNODE(fwnode), index, &res);

	if (ret)

		return ret;



	return res.start;

}

EXPORT_SYMBOL(fwnode_irq_get);



/**

 * device_graph_get_next_endpoint - Get next endpoint firmware node

 * @fwnode: Pointer to the parent firmware node

include/linux/acpi.h

+3 −0
Original line number Diff line number Diff line
@@ -56,6 +56,8 @@ static inline acpi_handle acpi_device_handle(struct acpi_device *adev) 
#define ACPI_COMPANION_SET(dev, adev)	set_primary_fwnode(dev, (adev) ? \

	acpi_fwnode_handle(adev) : NULL)

#define ACPI_HANDLE(dev)		acpi_device_handle(ACPI_COMPANION(dev))

#define ACPI_HANDLE_FWNODE(fwnode)	\

				acpi_device_handle(to_acpi_device_node(fwnode))



static inline struct fwnode_handle *acpi_alloc_fwnode_static(void)

{
@@ -626,6 +628,7 @@ int acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem, int *timer_count) 
#define ACPI_COMPANION(dev)		(NULL)

#define ACPI_COMPANION_SET(dev, adev)	do { } while (0)

#define ACPI_HANDLE(dev)		(NULL)

#define ACPI_HANDLE_FWNODE(fwnode)	(NULL)

#define ACPI_DEVICE_CLASS(_cls, _msk)	.cls = (0), .cls_msk = (0),



struct fwnode_handle;

include/linux/property.h

+2 −0
Original line number Diff line number Diff line
@@ -103,6 +103,8 @@ struct fwnode_handle *device_get_named_child_node(struct device *dev, 
struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);

void fwnode_handle_put(struct fwnode_handle *fwnode);



int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);



unsigned int device_get_child_node_count(struct device *dev);



static inline bool device_property_read_bool(struct device *dev,

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