diff options
| -rw-r--r-- | drivers/base/regmap/regmap.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 9b4badc2479d..c0aeda553c18 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -2184,6 +2184,11 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val, if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass || map->cache_type == REGCACHE_NONE) { + if (!map->bus->read) { + ret = -ENOTSUPP; + goto out; + } + /* Physical block read if there's no cache involved */ ret = _regmap_raw_read(map, reg, val, val_len); |