Changesets are very powerful, but the lack of a helper API
makes using them cumbersome. Introduce a simple copy based
API that makes things considerably easier.
To wit, adding a property using the raw API.
struct property *prop;
prop = kzalloc(sizeof(*prop)), GFP_KERNEL);
prop->name = kstrdup("compatible");
prop->value = kstrdup("foo,bar");
prop->length = strlen(prop->value) + 1;
of_changeset_add_property(ocs, np, prop);
while using the helper API
of_changeset_add_property_string(ocs, np, "compatible",
"foo,bar");
Signed-off-by: Pantelis Antoniou <pantelis.anton...@konsulko.com>
---
drivers/of/dynamic.c | 501 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/of.h | 143 +++++++++++++++
2 files changed, 644 insertions(+)
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index e4dea94..350b1cf 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -828,3 +828,504 @@ int of_changeset_action(struct of_changeset *ocs,
unsigned long action,
return 0;
}
EXPORT_SYMBOL_GPL(of_changeset_action);
+
+/* changeset helpers */
+
+/**
+ * of_changeset_create_device_node - Create an empty device node
+ *
+ * @ocs: changeset pointer
+ * @parent: parent device node
+ * @fmt: format string for the node's full_name
+ * @args: argument list for the format string
+ *
+ * Create an empty device node, marking it as detached and allocated.
+ *
+ * Returns a device node on success, an error encoded pointer otherwise
+ */
+struct device_node *of_changeset_create_device_nodev(
+ struct of_changeset *ocs, struct device_node *parent,
+ const char *fmt, va_list vargs)
+{
+ struct device_node *node;
+
+ node = __of_node_dupv(NULL, fmt, vargs);
+ if (!node)
+ return ERR_PTR(-ENOMEM);
+
+ node->parent = parent;
+ return node;
+}
+
+/**
+ * of_changeset_create_device_node - Create an empty device node
+ *
+ * @ocs: changeset pointer
+ * @parent: parent device node
+ * @fmt: Format string for the node's full_name
+ * ... Arguments
+ *
+ * Create an empty device node, marking it as detached and allocated.
+ *
+ * Returns a device node on success, an error encoded pointer otherwise
+ */
+struct device_node *of_changeset_create_device_node(
+ struct of_changeset *ocs, struct device_node *parent,
+ const char *fmt, ...)
+{
+ va_list vargs;
+ struct device_node *node;
+
+ va_start(vargs, fmt);
+ node = of_changeset_create_device_nodev(ocs, parent, fmt, vargs);
+ va_end(vargs);
+ return node;
+}
+
+static int __of_changeset_add_update_property_copy(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const void *value,
+ int length, bool update)
+{
+ struct property *prop;
+ char *new_name;
+ void *new_value;
+ int ret = -ENOMEM;
+
+ prop = kzalloc(sizeof(*prop), GFP_KERNEL);
+ if (!prop)
+ goto out_no_prop;
+
+ new_name = kstrdup(name, GFP_KERNEL);
+ if (!new_name)
+ goto out_no_name;
+
+ /*
+ * NOTE: There is no check for zero length value.
+ * In case of a boolean property, this will allocate a value
+ * of zero bytes. We do this to work around the use
+ * of of_get_property() calls on boolean values.
+ */
+ new_value = kmemdup(value, length, GFP_KERNEL);
+ if (!new_value)
+ goto out_no_value;
+
+ of_property_set_flag(prop, OF_DYNAMIC);
+
+ prop->name = new_name;
+ prop->value = new_value;
+ prop->length = length;
+
+ if (!update)
+ ret = of_changeset_add_property(ocs, np, prop);
+ else
+ ret = of_changeset_update_property(ocs, np, prop);
+
+ if (ret != 0)
+ goto out_no_add;
+
+ return 0;
+
+out_no_add:
+ kfree(prop->value);
+out_no_value:
+ kfree(prop->name);
+out_no_name:
+ kfree(prop);
+out_no_prop:
+ return ret;
+}
+
+static int __of_changeset_add_update_property_string(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *str,
+ bool update)
+{
+ return __of_changeset_add_update_property_copy(ocs, np, name, str,
+ strlen(str) + 1, update);
+}
+
+static int __of_changeset_add_update_property_stringv(struct of_changeset *ocs,
+ struct device_node *np, const char *name,
+ const char *fmt, va_list vargs, bool update)
+{
+ char *str;
+ int ret;
+
+ str = kvasprintf(GFP_KERNEL, fmt, vargs);
+ if (!str)
+ return -ENOMEM;
+
+ ret = __of_changeset_add_update_property_string(ocs, np, name, str,
update);
+
+ kfree(str);
+
+ return ret;
+}
+
+static int __of_changeset_add_update_property_string_list(
+ struct of_changeset *ocs, struct device_node *np, const char
*name,
+ const char **strs, int count, bool update)
+{
+ int total = 0, i, ret;
+ char *value, *s;
+
+ for (i = 0; i < count; i++) {
+ /* check if it's NULL */
+ if (!strs[i])
+ return -EINVAL;
+ total += strlen(strs[i]) + 1;
+ }
+
+ value = kmalloc(total, GFP_KERNEL);
+ if (!value)
+ return -ENOMEM;
+
+ for (i = 0, s = value; i < count; i++) {
+ /* no need to check for NULL, check above */
+ strcpy(s, strs[i]);
+ s += strlen(strs[i]) + 1;
+ }
+
+ ret = __of_changeset_add_update_property_copy(ocs, np, name, value,
+ total, update);
+
+ kfree(value);
+
+ return ret;
+}
+
+static int __of_changeset_add_update_property_u32(struct of_changeset *ocs,
+ struct device_node *np, const char *name, u32 val, bool update)
+{
+ /* in place */
+ val = cpu_to_be32(val);
+ return __of_changeset_add_update_property_copy(ocs, np, name, &val,
+ sizeof(val), update);
+}
+
+static int __of_changeset_add_update_property_bool(struct of_changeset *ocs,
+ struct device_node *np, const char *name, bool update)
+{
+ return __of_changeset_add_update_property_copy(ocs, np, name, "", 0,
+ update);
+}
+
+/**
+ * of_changeset_add_property_copy - Create a new property copying name & value
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @value: pointer to the value data
+ * @length: length of the value in bytes
+ *
+ * Adds a property to the changeset by making copies of the name & value
+ * entries.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_add_property_copy(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const void *value,
+ int length)
+{
+ return __of_changeset_add_update_property_copy(ocs, np, name, value,
+ length, false);
+}
+
+/**
+ * of_changeset_add_property_string - Create a new string property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @str: string property
+ *
+ * Adds a string property to the changeset by making copies of the name
+ * and the string value.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_add_property_string(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *str)
+{
+ return __of_changeset_add_update_property_string(ocs, np, name, str,
+ false);
+}
+
+/**
+ * of_changeset_add_property_stringf - Create a new formatted string property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @fmt: format of string property
+ * ... arguments of the format string
+ *
+ * Adds a string property to the changeset by making copies of the name
+ * and the formatted value.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_add_property_stringf(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *fmt, ...)
+{
+ va_list vargs;
+ int ret;
+
+ va_start(vargs, fmt);
+ ret = __of_changeset_add_update_property_stringv(ocs, np, name, fmt,
+ vargs, false);
+ va_end(vargs);
+ return ret;
+}
+
+/**
+ * of_changeset_add_property_string_list - Create a new string list property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @strs: pointer to the string list
+ * @count: string count
+ *
+ * Adds a string list property to the changeset.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_add_property_string_list(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char **strs,
+ int count)
+{
+ return __of_changeset_add_update_property_string_list(ocs, np, name,
+ strs, count, false);
+}
+
+/**
+ * of_changeset_add_property_u32 - Create a new u32 property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @val: value in host endian format
+ *
+ * Adds a u32 property to the changeset.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_add_property_u32(struct of_changeset *ocs,
+ struct device_node *np, const char *name, u32 val)
+{
+ return __of_changeset_add_update_property_u32(ocs, np, name,
+ val, false);
+}
+
+/**
+ * of_changeset_add_property_bool - Create a new u32 property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ *
+ * Adds a bool property to the changeset. Note that there is
+ * no option to set the value to false, since the property
+ * existing sets it to true.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_add_property_bool(struct of_changeset *ocs,
+ struct device_node *np, const char *name)
+{
+ return __of_changeset_add_update_property_bool(ocs, np, name, false);
+}
+
+/**
+ * of_changeset_update_property_copy - Update a property copying name & value
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @value: pointer to the value data
+ * @length: length of the value in bytes
+ *
+ * Update a property to the changeset by making copies of the name & value
+ * entries.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_update_property_copy(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const void *value,
+ int length)
+{
+ return __of_changeset_add_update_property_copy(ocs, np, name, value,
+ length, true);
+}
+
+/**
+ * of_changeset_update_property_string - Create a new string property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @str: string property
+ *
+ * Updates a string property to the changeset by making copies of the name
+ * and the string value.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_update_property_string(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *str)
+{
+ return __of_changeset_add_update_property_string(ocs, np, name, str,
+ true);
+}
+
+/**
+ * of_changeset_update_property_stringf - Update formatted string property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @fmt: format of string property
+ * ... arguments of the format string
+ *
+ * Updates a string property to the changeset by making copies of the name
+ * and the formatted value.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_update_property_stringf(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *fmt, ...)
+{
+ va_list vargs;
+ int ret;
+
+ va_start(vargs, fmt);
+ ret = __of_changeset_add_update_property_stringv(ocs, np, name, fmt,
+ vargs, true);
+ va_end(vargs);
+ return ret;
+}
+
+/**
+ * of_changeset_update_property_string_list - Update string list property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @strs: pointer to the string list
+ * @count: string count
+ *
+ * Updates a string list property to the changeset.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_update_property_string_list(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char **strs,
+ int count)
+{
+ return __of_changeset_add_update_property_string_list(ocs, np, name,
+ strs, count, true);
+}
+
+/**
+ * of_changeset_update_property_u32 - Update u32 property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ * @val: value in host endian format
+ *
+ * Updates a u32 property to the changeset.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_update_property_u32(struct of_changeset *ocs,
+ struct device_node *np, const char *name, u32 val)
+{
+ return __of_changeset_add_update_property_u32(ocs, np, name,
+ val, true);
+}
+
+/**
+ * of_changeset_update_property_bool - Update a bool property
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer
+ * @name: name of the property
+ *
+ * Updates a property to the changeset. Note that there is
+ * no option to set the value to false, since the property
+ * existing sets it to true.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_update_property_bool(struct of_changeset *ocs,
+ struct device_node *np, const char *name)
+{
+ return __of_changeset_add_update_property_bool(ocs, np, name, true);
+}
+
+static struct device_node *
+__of_changeset_node_move_one(struct of_changeset *ocs,
+ struct device_node *np, struct device_node *new_parent)
+{
+ struct device_node *np2;
+ const char *unitname;
+ int err;
+
+ err = of_changeset_detach_node(ocs, np);
+ if (err)
+ return ERR_PTR(err);
+
+ unitname = strrchr(np->full_name, '/');
+ if (!unitname)
+ unitname = np->full_name;
+
+ np2 = __of_node_dup(np, "%s/%s",
+ new_parent->full_name, unitname);
+ if (!np2)
+ return ERR_PTR(-ENOMEM);
+ np2->parent = new_parent;
+
+ err = of_changeset_attach_node(ocs, np2);
+ if (err)
+ return ERR_PTR(err);
+
+ return np2;
+}
+
+/**
+ * of_changeset_node_move_to - Moves a subtree to a new place in
+ * the tree
+ *
+ * @ocs: changeset pointer
+ * @np: device node pointer to be moved
+ * @to: device node of the new parent
+ *
+ * Moves a subtree to a new place in the tree.
+ * Note that a move is a safe operation because the phandles
+ * remain valid.
+ *
+ * Returns zero on success, a negative error value otherwise.
+ */
+int of_changeset_node_move(struct of_changeset *ocs,
+ struct device_node *np, struct device_node *new_parent)
+{
+ struct device_node *npc, *nppc;
+
+ /* move the root first */
+ nppc = __of_changeset_node_move_one(ocs, np, new_parent);
+ if (IS_ERR(nppc))
+ return PTR_ERR(nppc);
+
+ /* move the subtrees next */
+ for_each_child_of_node(np, npc) {
+ nppc = __of_changeset_node_move_one(ocs, npc, nppc);
+ if (IS_ERR(nppc)) {
+ of_node_put(npc);
+ return PTR_ERR(nppc);
+ }
+ }
+
+ return 0;
+}
diff --git a/include/linux/of.h b/include/linux/of.h
index 3175803..f015911 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1037,6 +1037,42 @@ static inline int of_changeset_update_property(struct
of_changeset *ocs,
{
return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
}
+
+struct device_node *of_changeset_create_device_nodev(
+ struct of_changeset *ocs, struct device_node *parent,
+ const char *fmt, va_list vargs);
+__printf(3, 4) struct device_node *of_changeset_create_device_node(
+ struct of_changeset *ocs, struct device_node *parent,
+ const char *fmt, ...);
+int of_changeset_add_property_copy(struct of_changeset *ocs,
+ struct device_node *np, const char *name,
+ const void *value, int length);
+int of_changeset_add_property_string(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *str);
+__printf(4, 5) int of_changeset_add_property_stringf(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *fmt, ...);
+int of_changeset_add_property_string_list(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char **strs, int count);
+int of_changeset_add_property_u32(struct of_changeset *ocs,
+ struct device_node *np, const char *name, u32 val);
+int of_changeset_add_property_bool(struct of_changeset *ocs,
+ struct device_node *np, const char *name);
+int of_changeset_update_property_copy(struct of_changeset *ocs,
+ struct device_node *np, const char *name,
+ const void *value, int length);
+int of_changeset_update_property_string(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *str);
+__printf(4, 5) int of_changeset_update_property_stringf(struct of_changeset
*ocs,
+ struct device_node *np, const char *name, const char *fmt, ...);
+int of_changeset_update_property_string_list(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char **strs, int count);
+int of_changeset_update_property_u32(struct of_changeset *ocs,
+ struct device_node *np, const char *name, u32 val);
+int of_changeset_update_property_bool(struct of_changeset *ocs,
+ struct device_node *np, const char *name);
+int of_changeset_node_move(struct of_changeset *ocs,
+ struct device_node *np, struct device_node *new_parent);
+
#else /* CONFIG_OF_DYNAMIC */
static inline int of_reconfig_notifier_register(struct notifier_block *nb)
{
@@ -1056,6 +1092,113 @@ static inline int of_reconfig_get_state_change(unsigned
long action,
{
return -EINVAL;
}
+
+static inline int of_changeset_create_device_node(struct of_changeset *ocs,
+ struct device_node *parent, const char *fmt, ...)
+{
+ return -EINVAL;
+}
+
+int of_changeset_add_property_copy(struct of_changeset *ocs,
+ struct device_node *np, const char *name,
+ const void *value, int length)
+{
+ return -EINVAL;
+}
+
+int of_changeset_add_property_string(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *str)
+{
+ return -EINVAL;
+}
+
+static inline struct device_node *of_changeset_create_device_nodev(
+ struct of_changeset *ocs, struct device_node *parent,
+ const char *fmt, va_list vargs)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline __printf(4, 5) struct device_node *
+ of_changeset_add_property_stringf(
+ struct of_changeset *ocs, struct device_node *np,
+ const char *name, const char *fmt, ...)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline int of_changeset_add_property_string_list(
+ struct of_changeset *ocs, struct device_node *np, const char *name,
+ const char **strs, int count)
+{
+ return -EINVAL;
+}
+
+static inline int of_changeset_add_property_u32(struct of_changeset *ocs,
+ struct device_node *np, const char *name, u32 val)
+{
+ return -EINVAL;
+}
+
+static inline int of_changeset_add_property_bool(struct of_changeset *ocs,
+ struct device_node *np, const char *name)
+{
+ return -EINVAL;
+}
+
+int of_changeset_update_property_copy(struct of_changeset *ocs,
+ struct device_node *np, const char *name,
+ const void *value, int length)
+{
+ return -EINVAL;
+}
+
+int of_changeset_update_property_string(struct of_changeset *ocs,
+ struct device_node *np, const char *name, const char *str)
+{
+ return -EINVAL;
+}
+
+static inline struct device_node *of_changeset_create_device_nodev(
+ struct of_changeset *ocs, struct device_node *parent,
+ const char *fmt, va_list vargs)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline __printf(4, 5) struct device_node *
+ of_changeset_update_property_stringf(
+ struct of_changeset *ocs, struct device_node *np,
+ const char *name, const char *fmt, ...)
+{
+ return ERR_PTR(-EINVAL);
+}
+
+static inline int of_changeset_update_property_string_list(
+ struct of_changeset *ocs, struct device_node *np, const char *name,
+ const char **strs, int count)
+{
+ return -EINVAL;
+}
+
+static inline int of_changeset_update_property_u32(struct of_changeset *ocs,
+ struct device_node *np, const char *name, u32 val)
+{
+ return -EINVAL;
+}
+
+static inline int of_changeset_update_property_bool(struct of_changeset *ocs,
+ struct device_node *np, const char *name)
+{
+ return -EINVAL;
+}
+
+static inline int of_changeset_node_move(struct of_changeset *ocs,
+ struct device_node *np, struct device_node *new_parent)
+{
+ return -EINVAL;
+}
+
#endif /* CONFIG_OF_DYNAMIC */
/* CONFIG_OF_RESOLVE api */
--
1.7.12
