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device property: Introduce fwnode_irq_get()

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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: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcin Wojtas 2018-01-18 13:31:40 +01:00 committed by David S. Miller
parent b28f263b86
commit 7c6c57f2ab
3 changed files with 31 additions and 0 deletions
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26
drivers/base/property.c
View File

@ -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

3
include/linux/acpi.h
View File

@ -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;

2
include/linux/property.h
View File

@ -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,