1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 1cf721421bec..f8a937654af2 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -21,6 +21,18 @@
 
 #include "internal.h"
 
+/*
+ * Sometimes for failures during very early init the trace
+ * infrastructure isn't available early enough to be used.  For this
+ * sort of problem defining LOG_DEVICE will add printks for basic
+ * register I/O on a specific device.
+ */
+#undef LOG_DEVICE
+
+static int _regmap_update_bits(struct regmap *map, unsigned int reg,
+                               unsigned int mask, unsigned int val,
+                               bool *change);
+
 bool regmap_writeable(struct regmap *map, unsigned int reg)
 {
         if (map->max_register && reg > map->max_register)
@@ -700,6 +712,11 @@ int _regmap_write(struct regmap *map, unsigned int reg,
                 }
         }
 
+#ifdef LOG_DEVICE
+        if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+                dev_info(map->dev, "%x <= %x\n", reg, val);
+#endif
+
         trace_regmap_reg_write(map->dev, reg, val);
 
         if (map->format.format_write) {
@@ -903,6 +920,12 @@ static int _regmap_read(struct regmap *map, unsigned int reg,
         ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
         if (ret == 0) {
                 *val = map->format.parse_val(map->work_buf);
+
+#ifdef LOG_DEVICE
+                if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
+                        dev_info(map->dev, "%x => %x\n", reg, *val);
+#endif
+
                 trace_regmap_reg_read(map->dev, reg, *val);
         }