fdt: Allow ft_board_setup() to report failure

This function can fail if the device tree runs out of space. Rather than
silently booting with an incomplete device tree, allow the failure to be
detected.

Unfortunately this involves changing a lot of places in the code. I have
not changed behvaiour to return an error where one is not currently
returned, to avoid unexpected breakage.

Eventually it would be nice to allow boards to register functions to be
called to update the device tree. This would avoid all the many functions
to do this. However it's not clear yet if this should be done using driver
model or with a linker list. This work is left for later.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>

include/fdt_support.h

@@ -64,7 +64,17 @@ static inline void fdt_fixup_crypto_node(void *blob, int sec_rev) {}
 int fdt_pci_dma_ranges(void *blob, int phb_off, struct pci_controller *hose);
 #endif
 
-void ft_board_setup(void *blob, bd_t *bd);
+/**
+ * Add board-specific data to the FDT before booting the OS.
+ *
+ * Use CONFIG_SYS_FDT_PAD to ensure there is sufficient space.
+ *
+ * @param blob		FDT blob to update
+ * @param bd_t		Pointer to board data
+ * @return 0 if ok, or -FDT_ERR_... on error
+ */
+int ft_board_setup(void *blob, bd_t *bd);
+
 /*
  * The keystone2 SOC requires all 32 bit aliased addresses to be converted
  * to their 36 physical format. This has to happen after all fdt nodes