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software node: implement reference properties

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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@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dmitry Torokhov 2019-11-07 20:22:22 -08:00 • committed by Rafael J. Wysocki
parent 996b0830f9
commit e64b674bc9
2 changed files with 82 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

57
include/linux/property.h
View file

@ -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.
@ -258,14 +273,20 @@ 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_) \
@ -276,6 +297,10 @@ 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_))
@ -287,6 +312,8 @@ 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) { \
@ -314,6 +341,18 @@ 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);
@ -377,20 +416,6 @@ 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