device_tree: add qemu_fdt_setprop_string_array helper

A string array in device tree is simply a series of \0 terminated
strings next to each other. As libfdt doesn't support that directly
we need to build it ourselves.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20210303173642.3805-4-alex.bennee@linaro.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/sysemu/device_tree.h b/include/sysemu/device_tree.h
index 982c89345f..8a2fe55622 100644
--- a/include/sysemu/device_tree.h
+++ b/include/sysemu/device_tree.h
@@ -70,6 +70,23 @@ int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
                          const char *property, uint64_t val);
 int qemu_fdt_setprop_string(void *fdt, const char *node_path,
                             const char *property, const char *string);
+
+/**
+ * qemu_fdt_setprop_string_array: set a string array property
+ *
+ * @fdt: pointer to the dt blob
+ * @name: node name
+ * @prop: property array
+ * @array: pointer to an array of string pointers
+ * @len: length of array
+ *
+ * assigns a string array to a property. This function converts and
+ * array of strings to a sequential string with \0 separators before
+ * setting the property.
+ */
+int qemu_fdt_setprop_string_array(void *fdt, const char *node_path,
+                                  const char *prop, char **array, int len);
+
 int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
                              const char *property,
                              const char *target_node_path);