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device property: Add function to search for named child of device

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For device nodes in both DT and ACPI, it possible to have named
child nodes which contain properties (an existing example being
gpio-leds). This adds a function to find a named child node for
a device which can be used by drivers for property retrieval.

For DT data node name matching, of_node_cmp() and similar functions
are made available outside of CONFIG_OF block so the new function
can reference these for DT and non-DT builds.

For ACPI data node name matching, a helper function is also added
which returns false if CONFIG_ACPI is not set, otherwise it
performs a string comparison on the data node name. This avoids
using the acpi_data_node struct for non CONFIG_ACPI builds,
which would otherwise cause a build failure.

Signed-off-by: Adam Thomson <[email protected]>
Acked-by: Sathyanarayana Nujella <[email protected]>
Acked-by: Rob Herring <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
This commit is contained in:
Adam Thomson 2016-06-21 18:50:20 +01:00 • committed by Mark Brown
commit 613e97218c
5 changed files with 51 additions and 7 deletions
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7
include/acpi/acpi_bus.h
View file

@ -420,6 +420,13 @@ static inline struct acpi_data_node *to_acpi_data_node(struct fwnode_handle *fwn
container_of(fwnode, struct acpi_data_node, fwnode) : NULL;
}
static inline bool acpi_data_node_match(struct fwnode_handle *fwnode,
const char *name)
{
return is_acpi_data_node(fwnode) ?
(!strcmp(to_acpi_data_node(fwnode)->name, name)) : false;
}
static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
{
return &adev->fwnode;