In later patches, we will parse CPU and memory NUMA information
from device tree. FDT is using device type property to indicate
CPU nodes and memory nodes. So we introduce fdt_node_check_type
in this patch to avoid redundant code in subsequent patches.
Signed-off-by: Wei Chen <wei.c...@arm.com>
---
xen/common/libfdt/fdt_ro.c | 15 +++++++++++++++
xen/include/xen/libfdt/libfdt.h | 25 +++++++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/xen/common/libfdt/fdt_ro.c b/xen/common/libfdt/fdt_ro.c
index 36f9b480d1..ae7794d870 100644
--- a/xen/common/libfdt/fdt_ro.c
+++ b/xen/common/libfdt/fdt_ro.c
@@ -545,6 +545,21 @@ int fdt_node_check_compatible(const void *fdt, int
nodeoffset,
return 1;
}
+int fdt_node_check_type(const void *fdt, int nodeoffset,
+ const char *type)
+{
+ const void *prop;
+ int len;
+
+ prop = fdt_getprop(fdt, nodeoffset, "device_type", &len);
+ if (!prop)
+ return len;
+ if (fdt_stringlist_contains(prop, len, type))
+ return 0;
+ else
+ return 1;
+}
+
int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
const char *compatible)
{
diff --git a/xen/include/xen/libfdt/libfdt.h b/xen/include/xen/libfdt/libfdt.h
index 7c75688a39..7e4930dbcd 100644
--- a/xen/include/xen/libfdt/libfdt.h
+++ b/xen/include/xen/libfdt/libfdt.h
@@ -799,6 +799,31 @@ int fdt_node_offset_by_phandle(const void *fdt, uint32_t
phandle);
int fdt_node_check_compatible(const void *fdt, int nodeoffset,
const char *compatible);
+/**
+ * fdt_node_check_type: check a node's device_type property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of a tree node
+ * @type: string to match against
+ *
+ *
+ * fdt_node_check_type() returns 0 if the given node contains a 'device_type'
+ * property with the given string as one of its elements, it returns non-zero
+ * otherwise, or on error.
+ *
+ * returns:
+ * 0, if the node has a 'device_type' property listing the given string
+ * 1, if the node has a 'device_type' property, but it does not list
+ * the given string
+ * -FDT_ERR_NOTFOUND, if the given node has no 'device_type' property
+ * -FDT_ERR_BADOFFSET, if nodeoffset does not refer to a BEGIN_NODE tag
+ * -FDT_ERR_BADMAGIC,
+ * -FDT_ERR_BADVERSION,
+ * -FDT_ERR_BADSTATE,
+ * -FDT_ERR_BADSTRUCTURE, standard meanings
+ */
+int fdt_node_check_type(const void *fdt, int nodeoffset,
+ const char *type);
+
/**
* fdt_node_offset_by_compatible - find nodes with a given 'compatible' value
* @fdt: pointer to the device tree blob
--
2.25.1
