X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=include%2Ffdt_support.h;h=296add01f34f9ece7f172b4a59c3cff9eb63d474;hb=312a6c016a2d81aa3fbc605f5c0c315b6a4e3464;hp=5d4f28dc786e7b91e58b4b1b3190f4ad96e0d411;hpb=ace97d26176a3ebc9ec07738450de93eea35975c;p=platform%2Fkernel%2Fu-boot.git

diff --git a/include/fdt_support.h b/include/fdt_support.h
index 5d4f28d..296add0 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -16,8 +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,
@@ -40,8 +67,34 @@ void do_fixup_by_compat(void *fdt, const char *compat,
 			const char *prop, const void *val, int len, int create);
 void do_fixup_by_compat_u32(void *fdt, const char *compat,
 			    const char *prop, u32 val, int create);
+/**
+ * Setup the memory node in the DT. Creates one if none was existing before.
+ * Calls fdt_fixup_memory_banks() to populate a single reg pair covering the
+ * whole memory.
+ *
+ * @param blob		FDT blob to update
+ * @param start		Begin of DRAM mapping in physical memory
+ * @param size		Size of the single memory bank
+ * @return 0 if ok, or -1 or -FDT_ERR_... on error
+ */
 int fdt_fixup_memory(void *blob, u64 start, u64 size);
+
+/**
+ * Fill the DT memory node with multiple memory banks.
+ * Creates the node if none was existing before.
+ * If banks is 0, it will not touch the existing reg property. This allows
+ * boards to not mess with the existing DT setup, which may have been
+ * filled in properly before.
+ *
+ * @param blob		FDT blob to update
+ * @param start		Array of size <banks> to hold the start addresses.
+ * @param size		Array of size <banks> to hold the size of each region.
+ * @param banks		Number of memory banks to create. If 0, the reg
+ *			property will be left untouched.
+ * @return 0 if ok, or -1 or -FDT_ERR_... on error
+ */
 int fdt_fixup_memory_banks(void *blob, u64 start[], u64 size[], int banks);
+
 void fdt_fixup_ethernet(void *fdt);
 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
 			 const void *val, int len, int create);