It is possible to store references to software nodes in the same fashion as
other static properties, so that users do not need to define separate
structures:
static const struct software_node gpio_bank_b_node = {
.name = "B",
};
static const struct property_entry simone_key_enter_props[] = {
PROPERTY_ENTRY_U32("linux,code", KEY_ENTER),
PROPERTY_ENTRY_STRING("label", "enter"),
PROPERTY_ENTRY_REF("gpios", &gpio_bank_b_node, 123, GPIO_ACTIVE_LOW),
{ }
};
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/base/swnode.c | 49 ++++++++++++++++++++++++++++------
include/linux/property.h | 57 +++++++++++++++++++++++++++++-----------
2 files changed, 82 insertions(+), 24 deletions(-)
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 3d422918a53d9..604d7327bba79 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -246,6 +246,13 @@ static int property_entry_copy_data(struct property_entry *dst,
if (!src->is_inline && !src->length)
return -ENODATA;
+ /*
+ * Reference properties are never stored inline as
+ * they are too big.
+ */
+ if (src->type == DEV_PROP_REF && src->is_inline)
+ return -EINVAL;
+
if (src->length <= sizeof(dst->value)) {
dst_ptr = &dst->value;
dst->is_inline = true;
@@ -473,23 +480,49 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode,
{
struct swnode *swnode = to_swnode(fwnode);
const struct software_node_reference *ref;
+ const struct software_node_ref_args *ref_array;
+ const struct software_node_ref_args *ref_args;
const struct property_entry *prop;
struct fwnode_handle *refnode;
u32 nargs_prop_val;
int error;
int i;
- if (!swnode || !swnode->node->references)
+ if (!swnode)
return -ENOENT;
- for (ref = swnode->node->references; ref->name; ref++)
- if (!strcmp(ref->name, propname))
- break;
+ prop = property_entry_get(swnode->node->properties, propname);
+ if (prop) {
+ if (prop->type != DEV_PROP_REF)
+ return -EINVAL;
- if (!ref->name || index > (ref->nrefs - 1))
- return -ENOENT;
+ /*
+ * We expect that references are never stored inline, even
+ * single ones, as they are too big.
+ */
+ if (prop->is_inline)
+ return -EINVAL;
+
+ if (index * sizeof(*ref_args) >= prop->length)
+ return -ENOENT;
+
+ ref_array = prop->pointer;
+ ref_args = &ref_array[index];
+ } else {
+ if (!swnode->node->references)
+ return -ENOENT;
+
+ for (ref = swnode->node->references; ref->name; ref++)
+ if (!strcmp(ref->name, propname))
+ break;
+
+ if (!ref->name || index > (ref->nrefs - 1))
+ return -ENOENT;
+
+ ref_args = &ref->refs[index];
+ }
- refnode = software_node_fwnode(ref->refs[index].node);
+ refnode = software_node_fwnode(ref_args->node);
if (!refnode)
return -ENOENT;
@@ -510,7 +543,7 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode,
args->nargs = nargs;
for (i = 0; i < nargs; i++)
- args->args[i] = ref->refs[index].args[i];
+ args->args[i] = ref_args->args[i];
return 0;
}
diff --git a/include/linux/property.h b/include/linux/property.h
index c592c286e3394..19b9dcc322763 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -22,6 +22,7 @@ enum dev_prop_type {
DEV_PROP_U32,
DEV_PROP_U64,
DEV_PROP_STRING,
+ DEV_PROP_REF,
};
enum dev_dma_attr {
@@ -223,6 +224,20 @@ static inline int fwnode_property_count_u64(const struct fwnode_handle *fwnode,
return fwnode_property_read_u64_array(fwnode, propname, NULL, 0);
}
+struct software_node;
+
+/**
+ * struct software_node_ref_args - Reference property with additional arguments
+ * @node: Reference to a software node
+ * @nargs: Number of elements in @args array
+ * @args: Integer arguments
+ */
+struct software_node_ref_args {
+ const struct software_node *node;
+ unsigned int nargs;
+ u64 args[NR_FWNODE_REFERENCE_ARGS];
+};
+
/**
* struct property_entry - "Built-in" device property representation.
* @name: Name of the property.
@@ -260,14 +275,20 @@ struct property_entry {
#define __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_) \
sizeof(((struct property_entry *)NULL)->value._elem_[0])
-#define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
+#define __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, _elsize_, _Type_, \
+ _val_, _len_) \
(struct property_entry) { \
.name = _name_, \
- .length = (_len_) * __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
+ .length = (_len_) * (_elsize_), \
.type = DEV_PROP_##_Type_, \
{ .pointer = _val_ }, \
}
+#define __PROPERTY_ENTRY_ARRAY_LEN(_name_, _elem_, _Type_, _val_, _len_)\
+ __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
+ __PROPERTY_ENTRY_ELEMENT_SIZE(_elem_), \
+ _Type_, _val_, _len_)
+
#define PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, _len_) \
__PROPERTY_ENTRY_ARRAY_LEN(_name_, u8_data, U8, _val_, _len_)
#define PROPERTY_ENTRY_U16_ARRAY_LEN(_name_, _val_, _len_) \
@@ -278,6 +299,10 @@ struct property_entry {
__PROPERTY_ENTRY_ARRAY_LEN(_name_, u64_data, U64, _val_, _len_)
#define PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, _len_) \
__PROPERTY_ENTRY_ARRAY_LEN(_name_, str, STRING, _val_, _len_)
+#define PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, _len_) \
+ __PROPERTY_ENTRY_ARRAY_ELSIZE_LEN(_name_, \
+ sizeof(struct software_node_ref_args), \
+ REF, _val_, _len_)
#define PROPERTY_ENTRY_U8_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_U8_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
@@ -289,6 +314,8 @@ struct property_entry {
PROPERTY_ENTRY_U64_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define PROPERTY_ENTRY_STRING_ARRAY(_name_, _val_) \
PROPERTY_ENTRY_STRING_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
+#define PROPERTY_ENTRY_REF_ARRAY(_name_, _val_) \
+ PROPERTY_ENTRY_REF_ARRAY_LEN(_name_, _val_, ARRAY_SIZE(_val_))
#define __PROPERTY_ENTRY_ELEMENT(_name_, _elem_, _Type_, _val_) \
(struct property_entry) { \
@@ -316,6 +343,18 @@ struct property_entry {
.is_inline = true, \
}
+#define PROPERTY_ENTRY_REF(_name_, _ref_, ...) \
+(struct property_entry) { \
+ .name = _name_, \
+ .length = sizeof(struct software_node_ref_args), \
+ .type = DEV_PROP_REF, \
+ { .pointer = &(const struct software_node_ref_args) { \
+ .node = _ref_, \
+ .nargs = ARRAY_SIZE(((u64[]){ 0, ##__VA_ARGS__ })) - 1, \
+ .args = { __VA_ARGS__ }, \
+ } }, \
+}
+
struct property_entry *
property_entries_dup(const struct property_entry *properties);
@@ -379,20 +418,6 @@ int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
/* -------------------------------------------------------------------------- */
/* Software fwnode support - when HW description is incomplete or missing */
-struct software_node;
-
-/**
- * struct software_node_ref_args - Reference with additional arguments
- * @node: Reference to a software node
- * @nargs: Number of elements in @args array
- * @args: Integer arguments
- */
-struct software_node_ref_args {
- const struct software_node *node;
- unsigned int nargs;
- u64 args[NR_FWNODE_REFERENCE_ARGS];
-};
-
/**
* struct software_node_reference - Named software node reference property
* @name: Name of the property
--
2.24.0.rc1.363.gb1bccd3e3d-goog
