Using fwnode_get_id(), get the reg property value for DT node
or get the _ADR object value for ACPI node.
Signed-off-by: Calvin Johnson <calvin.johnson@xxxxxxxxxxx>
---
Changes in v4:
- Improve code structure to handle all cases
Changes in v3:
- Modified to retrieve reg property value for ACPI as well
- Resolved compilation issue with CONFIG_ACPI = n
- Added more info into documentation
Changes in v2: None
drivers/base/property.c | 34 ++++++++++++++++++++++++++++++++++
include/linux/property.h | 1 +
2 files changed, 35 insertions(+)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 35b95c6ac0c6..f0581bbf7a4b 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -580,6 +580,40 @@ const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
return fwnode_call_ptr_op(fwnode, get_name_prefix);
}
+/**
+ * fwnode_get_id - Get the id of a fwnode.
+ * @fwnode: firmware node
+ * @id: id of the fwnode
+ *
+ * This function provides the id of a fwnode which can be either
+ * DT or ACPI node. For ACPI, "reg" property value, if present will
+ * be provided or else _ADR value will be provided.
+ * Returns 0 on success or a negative errno.
+ */
+int fwnode_get_id(struct fwnode_handle *fwnode, u32 *id)
+{
+#ifdef CONFIG_ACPI
+ unsigned long long adr;
+ acpi_status status;
+#endif
+ int ret;
+
+ ret = fwnode_property_read_u32(fwnode, "reg", id);
+ if (ret) {
+#ifdef CONFIG_ACPI
+ status = acpi_evaluate_integer(ACPI_HANDLE_FWNODE(fwnode),
+ METHOD_NAME__ADR, NULL, &adr);
+ if (ACPI_FAILURE(status))
+ return -EINVAL;
+ *id = (u32)adr;
+#else
+ return ret;
+#endif
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(fwnode_get_id);
+
/**
* fwnode_get_parent - Return parent firwmare node
* @fwnode: Firmware whose parent is retrieved
diff --git a/include/linux/property.h b/include/linux/property.h
index 0a9001fe7aea..3f41475f010b 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -82,6 +82,7 @@ struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
const char *fwnode_get_name(const struct fwnode_handle *fwnode);
const char *fwnode_get_name_prefix(const struct fwnode_handle *fwnode);
+int fwnode_get_id(struct fwnode_handle *fwnode, u32 *id);
struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
struct fwnode_handle *fwnode_get_next_parent(
struct fwnode_handle *fwnode);
--
2.17.1
