[PATCH v2 1/9] of: provide of_machine_read_compatible()

[Bartosz Golaszewski]

Provide a helper function allowing users to read the compatible string
of the machine, hiding the access to the root node.

Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@xxxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxxxxxxxx>
---
 drivers/of/base.c  | 15 +++++++++++++++
 include/linux/of.h |  8 ++++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 57420806c1a2b9a3c67b5dcc0f95610a87c2e46f..b70aec32e0e35ee232b413e548742491bf763df7 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -434,6 +434,21 @@ bool of_machine_compatible_match(const char *const *compats)
 }
 EXPORT_SYMBOL(of_machine_compatible_match);
 
+/**
+ * of_machine_read_compatible - Get the compatible string of this machine
+ * @compatible: address at which the address of the compatible string will be
+ *              stored
+ * @index: index of the compatible entry in the list
+ *
+ * Returns:
+ * 0 on success, negative error number on failure.
+ */
+int of_machine_read_compatible(const char **compatible, unsigned int index)
+{
+	return of_property_read_string_index(of_root, "compatible", index, compatible);
+}
+EXPORT_SYMBOL_GPL(of_machine_read_compatible);
+
 /**
  * of_machine_device_match - Test root of device tree against a of_device_id array
  * @matches:	NULL terminated array of of_device_id match structures to search in
diff --git a/include/linux/of.h b/include/linux/of.h
index be6ec4916adf522aa5e4dcb1480fe91e1a4e29d2..7df971d52b556f21b510a8b5ebfc8df49a2a6f64 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -426,6 +426,8 @@ static inline bool of_machine_is_compatible(const char *compat)
 	return of_machine_compatible_match(compats);
 }
 
+int of_machine_read_compatible(const char **compatible, unsigned int index);
+
 extern int of_add_property(struct device_node *np, struct property *prop);
 extern int of_remove_property(struct device_node *np, struct property *prop);
 extern int of_update_property(struct device_node *np, struct property *newprop);
@@ -851,6 +853,12 @@ static inline int of_machine_is_compatible(const char *compat)
 	return 0;
 }
 
+static inline int of_machine_read_compatible(const char **compatible,
+					     unsigned int index)
+{
+	return -ENOSYS;
+}
+
 static inline int of_add_property(struct device_node *np, struct property *prop)
 {
 	return 0;

-- 
2.47.3