diff options
| -rw-r--r-- | drivers/base/property.c | 27 | ||||
| -rw-r--r-- | include/linux/property.h | 20 |
2 files changed, 47 insertions, 0 deletions
diff --git a/drivers/base/property.c b/drivers/base/property.c index c1392743df9c3..f42f32ff45fc2 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -945,6 +945,33 @@ unsigned int device_get_child_node_count(const struct device *dev) } EXPORT_SYMBOL_GPL(device_get_child_node_count); +/** + * fwnode_get_named_child_node_count - number of child nodes with given name + * @fwnode: Node which child nodes are counted. + * @name: String to match child node name against. + * + * Scan child nodes and count all the nodes with a specific name. Potential + * 'number' -ending after the 'at sign' for scanned names is ignored. + * E.g.:: + * fwnode_get_named_child_node_count(fwnode, "channel"); + * would match all the nodes:: + * channel { }, channel@0 {}, channel@0xabba {}... + * + * Return: the number of child nodes with a matching name for a given device. + */ +unsigned int fwnode_get_named_child_node_count(const struct fwnode_handle *fwnode, + const char *name) +{ + struct fwnode_handle *child; + unsigned int count = 0; + + fwnode_for_each_named_child_node(fwnode, child, name) + count++; + + return count; +} +EXPORT_SYMBOL_GPL(fwnode_get_named_child_node_count); + bool device_dma_supported(const struct device *dev) { return fwnode_call_bool_op(dev_fwnode(dev), device_dma_supported); diff --git a/include/linux/property.h b/include/linux/property.h index e214ecd241eb4..3e83babac0b06 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -167,6 +167,10 @@ struct fwnode_handle *fwnode_get_next_available_child_node( for (child = fwnode_get_next_child_node(fwnode, NULL); child; \ child = fwnode_get_next_child_node(fwnode, child)) +#define fwnode_for_each_named_child_node(fwnode, child, name) \ + fwnode_for_each_child_node(fwnode, child) \ + if (!fwnode_name_eq(child, name)) { } else + #define fwnode_for_each_available_child_node(fwnode, child) \ for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\ child = fwnode_get_next_available_child_node(fwnode, child)) @@ -178,11 +182,19 @@ struct fwnode_handle *device_get_next_child_node(const struct device *dev, for (child = device_get_next_child_node(dev, NULL); child; \ child = device_get_next_child_node(dev, child)) +#define device_for_each_named_child_node(dev, child, name) \ + device_for_each_child_node(dev, child) \ + if (!fwnode_name_eq(child, name)) { } else + #define device_for_each_child_node_scoped(dev, child) \ for (struct fwnode_handle *child __free(fwnode_handle) = \ device_get_next_child_node(dev, NULL); \ child; child = device_get_next_child_node(dev, child)) +#define device_for_each_named_child_node_scoped(dev, child, name) \ + device_for_each_child_node_scoped(dev, child) \ + if (!fwnode_name_eq(child, name)) { } else + struct fwnode_handle *fwnode_get_named_child_node(const struct fwnode_handle *fwnode, const char *childname); struct fwnode_handle *device_get_named_child_node(const struct device *dev, @@ -210,6 +222,14 @@ 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_named_child_node_count(const struct fwnode_handle *fwnode, + const char *name); +static inline unsigned int device_get_named_child_node_count(const struct device *dev, + const char *name) +{ + return fwnode_get_named_child_node_count(dev_fwnode(dev), name); +} + static inline int device_property_read_u8(const struct device *dev, const char *propname, u8 *val) { |