This instroduces comments that explain the purpose, parameters and return codes
of a few fdt support functions, that are used to fill the fdt.
Signed-off-by: Paul Kocialkowski <cont...@paulk.fr>
---
include/fdt_support.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/include/fdt_support.h b/include/fdt_support.h
index 56185c9..0edc4fa 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -16,9 +16,35 @@ u32 fdt_getprop_u32_default_node(const void *fdt, int off,
int cell,
const char *prop, const u32 dflt);
u32 fdt_getprop_u32_default(const void *fdt, const char *path,
const char *prop, const u32 dflt);
+
+/**
+ * Add data to the root of the FDT before booting the OS.
+ *
+ * See doc/device-tree-bindings/root.txt
+ *
+ * @param fdt FDT address in memory
+ * @return 0 if ok, or -FDT_ERR_... on error
+ */
int fdt_root(void *fdt);
+
+/**
+ * Add chosen data the FDT before booting the OS.
+ *
+ * In particular, this adds the kernel command line (bootargs) to the FDT.
+ *
+ * @param fdt FDT address in memory
+ * @return 0 if ok, or -FDT_ERR_... on error
+ */
int fdt_chosen(void *fdt);
+
+/**
+ * Add initrd information to the FDT before booting the OS.
+ *
+ * @param fdt FDT address in memory
+ * @return 0 if ok, or -FDT_ERR_... on error
+ */
int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end);
+
void do_fixup_by_path(void *fdt, const char *path, const char *prop,
const void *val, int len, int create);
void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
--
1.9.1
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