[PATCH v3 1/5] device_tree: add qemu_fdt_setprop_strings() helper

[Ben Dooks]

Add a helper to set a property from a set of strings
to reduce the following code:

    static const char * const clint_compat[2] = {
        "sifive,clint0", "riscv,clint0"
    };

    qemu_fdt_setprop_string_array(fdt, nodename, "compatible",
        (char **)&clint_compat, ARRAY_SIZE(clint_compat));

Signed-off-by: Ben Dooks <qemu@ben.fluff.org>
---
v3;
 - fix return value for the call
 - add better help text
v2:
 - fix node/path in comment
---
 include/sysemu/device_tree.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h
index ef060a9759..83bdfe390e 100644
--- a/include/sysemu/device_tree.h
+++ b/include/sysemu/device_tree.h
@@ -87,6 +87,25 @@ int qemu_fdt_setprop_string(void *fdt, const char *node_path,
 int qemu_fdt_setprop_string_array(void *fdt, const char *node_path,
                                   const char *prop, char **array, int len);
 
+/**
+ * qemu_fdt_setprop_strings: set a property from a set of strings
+ *
+ * @fdt: pointer to the dt blob
+ * @path: node name
+ * @prop: property array
+ *
+ * This is a helper for the qemu_fdt_setprop_string_array() function
+ * which takes a va-arg set of strings instead of having to setup a
+ * single use string array.
+ */
+#define qemu_fdt_setprop_strings(fdt, path, prop, ...)          \
+    ({ int __ret; do {                                          \
+        static const char * const __strs[] = { __VA_ARGS__ };   \
+        __ret = qemu_fdt_setprop_string_array(fdt, path, prop,  \
+                (char **)&__strs, ARRAY_SIZE(__strs));          \
+     } while(0); __ret; })
+
+
 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
                              const char *property,
                              const char *target_node_path);
-- 
2.35.1