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commit fd6868d82b824b1bea42001ecc2411f2689d3634
parent a3ea9911e225337472fe7cc9278966049a1571e5
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Sun,  2 Sep 2018 10:56:01 -0700

Merge tag 'devicetree-fixes-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull devicetree updates from Rob Herring:
 "A couple of new helper functions in preparation for some tree wide
  clean-ups.

  I'm sending these new helpers now for rc2 in order to simplify the
  dependencies on subsequent cleanups across the tree in 4.20"

* tag 'devicetree-fixes-for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  of: Add device_type access helper functions
  of: add node name compare helper functions
  of: add helper to lookup compatible child node

Diffstat:
Mdrivers/of/base.c | 47+++++++++++++++++++++++++++++++++++++++++++++++
Minclude/linux/of.h | 33+++++++++++++++++++++++++++++++++
2 files changed, 80 insertions(+), 0 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c @@ -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; @@ -720,6 +742,31 @@ struct device_node *of_get_next_available_child(const struct device_node *node, EXPORT_SYMBOL(of_get_next_available_child); /** + * of_get_compatible_child - Find compatible child node + * @parent: parent node + * @compatible: compatible string + * + * Lookup child node whose compatible property contains the given compatible + * string. + * + * Returns a node pointer with refcount incremented, use of_node_put() on it + * when done; or NULL if not found. + */ +struct device_node *of_get_compatible_child(const struct device_node *parent, + const char *compatible) +{ + struct device_node *child; + + for_each_child_of_node(parent, child) { + if (of_device_is_compatible(child, compatible)) + break; + } + + return child; +} +EXPORT_SYMBOL(of_get_compatible_child); + +/** * of_get_child_by_name - Find the child node by name for a given parent * @node: parent node * @name: child name to look for. diff --git a/include/linux/of.h b/include/linux/of.h @@ -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>"; @@ -290,6 +293,8 @@ extern struct device_node *of_get_next_child(const struct device_node *node, extern struct device_node *of_get_next_available_child( const struct device_node *node, struct device_node *prev); +extern struct device_node *of_get_compatible_child(const struct device_node *parent, + const char *compatible); extern struct device_node *of_get_child_by_name(const struct device_node *node, const char *name); @@ -561,6 +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>"; @@ -632,6 +647,12 @@ static inline bool of_have_populated_dt(void) return false; } +static inline struct device_node *of_get_compatible_child(const struct device_node *parent, + const char *compatible) +{ + return NULL; +} + static inline struct device_node *of_get_child_by_name( const struct device_node *node, const char *name) @@ -967,6 +988,18 @@ static inline struct device_node *of_find_matching_node( return of_find_matching_node_and_match(from, matches, NULL); } +static inline const char *of_node_get_device_type(const struct device_node *np) +{ + return of_get_property(np, "type", NULL); +} + +static inline bool of_node_is_type(const struct device_node *np, const char *type) +{ + const char *match = of_node_get_device_type(np); + + return np && match && type && !strcmp(match, type); +} + /** * of_property_count_u8_elems - Count the number of u8 elements in a property *