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device property: Split fwnode_get_child_node_count()

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The new helper is introduced to allow counting the child firmware nodes
of their parent without requiring a device to be passed. This also makes
the fwnode and device property API more symmetrical with the rest.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: "Rafael J. Wysocki" <rafael@kernel.org>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20250310150835.3139322-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Andy Shevchenko
2025-03-10 16:54:51 +02:00
committed by Lee Jones
parent 0af2f6be1b
commit 1490cbb9db
2 changed files with 12 additions and 7 deletions
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12
drivers/base/property.c
View File

@@ -928,22 +928,22 @@ bool fwnode_device_is_available(const struct fwnode_handle *fwnode)
EXPORT_SYMBOL_GPL(fwnode_device_is_available); EXPORT_SYMBOL_GPL(fwnode_device_is_available);
/** /**
* device_get_child_node_count - return the number of child nodes for device * fwnode_get_child_node_count - return the number of child nodes for a given firmware node
* @dev: Device to count the child nodes for * @fwnode: Pointer to the parent firmware node
* *
* Return: the number of child nodes for a given device. * Return: the number of child nodes for a given firmware node.
*/ */
unsigned int device_get_child_node_count(const struct device *dev) unsigned int fwnode_get_child_node_count(const struct fwnode_handle *fwnode)
{ {
struct fwnode_handle *child; struct fwnode_handle *child;
unsigned int count = 0; unsigned int count = 0;
device_for_each_child_node(dev, child) fwnode_for_each_child_node(fwnode, child)
count++; count++;
return count; return count;
} }
EXPORT_SYMBOL_GPL(device_get_child_node_count); EXPORT_SYMBOL_GPL(fwnode_get_child_node_count);
bool device_dma_supported(const struct device *dev) bool device_dma_supported(const struct device *dev)
{ {

7
include/linux/property.h
View File

@@ -208,7 +208,12 @@ DEFINE_FREE(fwnode_handle, struct fwnode_handle *, fwnode_handle_put(_T))
int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index); int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name); int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
unsigned int device_get_child_node_count(const struct device *dev); unsigned int fwnode_get_child_node_count(const struct fwnode_handle *fwnode);
static inline unsigned int device_get_child_node_count(const struct device *dev)
{
return fwnode_get_child_node_count(dev_fwnode(dev));
}
static inline int device_property_read_u8(const struct device *dev, static inline int device_property_read_u8(const struct device *dev,
const char *propname, u8 *val) const char *propname, u8 *val)