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of: add node name compare helper functions

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In preparation to remove device_node.name pointer, add helper functions
for node name comparisons which are a common pattern throughout the kernel.

Cc: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring 2018-08-27 07:50:47 -05:00
parent 36156f9241
commit f42b0e18f2
2 changed files with 35 additions and 0 deletions
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22
drivers/of/base.c
View File

@ -54,6 +54,28 @@ DEFINE_MUTEX(of_mutex);
*/
DEFINE_RAW_SPINLOCK(devtree_lock);
bool of_node_name_eq(const struct device_node *np, const char *name)
{
const char *node_name;
size_t len;
if (!np)
return false;
node_name = kbasename(np->full_name);
len = strchrnul(node_name, '@') - node_name;
return (strlen(name) == len) && (strncmp(node_name, name, len) == 0);
}
bool of_node_name_prefix(const struct device_node *np, const char *prefix)
{
if (!np)
return false;
return strncmp(kbasename(np->full_name), prefix, strlen(prefix)) == 0;
}
int of_n_addr_cells(struct device_node *np)
{
u32 cells;

13
include/linux/of.h
View File

@ -256,6 +256,9 @@ static inline unsigned long of_read_ulong(const __be32 *cell, int size)
#define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
#define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
extern bool of_node_name_eq(const struct device_node *np, const char *name);
extern bool of_node_name_prefix(const struct device_node *np, const char *prefix);
static inline const char *of_node_full_name(const struct device_node *np)
{
return np ? np->full_name : "<no-node>";
@ -563,6 +566,16 @@ static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
return NULL;
}
static inline bool of_node_name_eq(const struct device_node *np, const char *name)
{
return false;
}
static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix)
{
return false;
}
static inline const char* of_node_full_name(const struct device_node *np)
{
return "<no-node>";