regmap: Add error output

Add some debug output in cases where the initialization of a regmap
fails.

Reviewed-by: Anatolij Gustschin <agust@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Mario Six <mario.six@gdsys.cc>

diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c
index 25c1ae5d7dff5ea30af0fef048bb4c01ce30dd9d..154426269d97ab87ceeea516c444c3fb49a629e4 100644 (file)
--- a/drivers/core/regmap.c
+++ b/drivers/core/regmap.c
@@ -139,12 +139,18 @@ int regmap_init_mem(ofnode node, struct regmap **mapp)
        }
 
        len = ofnode_read_size(node, "reg");
-       if (len < 0)
+       if (len < 0) {
+               debug("%s: Error while reading reg size (ret = %d)\n",
+                     ofnode_get_name(node), len);
                return len;
+       }
        len /= sizeof(fdt32_t);
        count = len / both_len;
-       if (!count)
+       if (!count) {
+               debug("%s: Not enough data in reg property\n",
+                     ofnode_get_name(node));
                return -EINVAL;
+       }
 
        map = regmap_alloc(count);
        if (!map)