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| author | Marcin Wojtas <mw@semihalf.com> | 2018-01-18 15:31:40 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-22 18:57:04 +0300 |
| commit | 7c6c57f2ab2c5113844fe187a7c45c4bd76dc671 (patch) | |
| tree | 41132234dab217c94395fed1f1d628ee4a6d6e73 /drivers/base | |
| parent | b28f263b86709a1e26d7207112030e970abf4aab (diff) | |
| download | linux-7c6c57f2ab2c5113844fe187a7c45c4bd76dc671.tar.xz | |
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: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/property.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/base/property.c b/drivers/base/property.c index 7c4a53d20e6d..1d6c9d99d72f 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -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> @@ -1230,6 +1231,31 @@ 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 * @prev: Previous endpoint node or %NULL to get the first |