of/flattree: Merge of_flat_dt_is_compatible

[firefly-linux-kernel-4.4.55.git] / drivers / of / fdt.c

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index b17a9086cbfc9f4dd523cd41329205d55b796b85..5cdd958db9af6210d40dd9bce06e56b326c17d49 100644 (file)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -142,3 +142,27 @@ void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
        } while (1);
 }
 
+/**
+ * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
+ * @node: node to test
+ * @compat: compatible string to compare with compatible list.
+ */
+int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
+{
+       const char *cp;
+       unsigned long cplen, l;
+
+       cp = of_get_flat_dt_prop(node, "compatible", &cplen);
+       if (cp == NULL)
+               return 0;
+       while (cplen > 0) {
+               if (strncasecmp(cp, compat, strlen(compat)) == 0)
+                       return 1;
+               l = strlen(cp) + 1;
+               cp += l;
+               cplen -= l;
+       }
+
+       return 0;
+}
+