fdt: Avoid early panic() when there is no FDT present

CONFIG_OF_CONTROL requires a valid device tree. However, we cannot call
panic() before the console is set up since the message does not appear,
and we get a silent failure.

Remove the panic from fdtdec_check_fdt() and provide a new function to
prepare the fdt for use. This will be called after the console is ready.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/include/fdtdec.h b/include/fdtdec.h
index bde9873656..6249f22e81 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -155,8 +155,21 @@ s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
 int fdtdec_get_is_enabled(const void *blob, int node);
 
 /**
- * Checks whether we have a valid fdt available to control U-Boot, and panic
- * if not.
+ * Make sure we have a valid fdt available to control U-Boot.
+ *
+ * If not, a message is printed to the console if the console is ready.
+ *
+ * @return 0 if all ok, -1 if not
+ */
+int fdtdec_prepare_fdt(void);
+
+/**
+ * Checks that we have a valid fdt available to control U-Boot.
+
+ * However, if not then for the moment nothing is done, since this function
+ * is called too early to panic().
+ *
+ * @returns 0
  */
 int fdtdec_check_fdt(void);