regmap: Support some more block operations on cached devices

Commit 10a08d9f ("regmap: Support some block operations on cached devices")
allowed raw read operations without throwing a warning when using caches if
all registers are volatile. This patch does the same for raw write operations.

This is for example useful when loading a firmware in a predefined volatile
region on a chip where we otherwise want registers to be cached.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 5c4e76de38d..3e30d168eb1 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -389,9 +389,11 @@ EXPORT_SYMBOL_GPL(regmap_write);
 int regmap_raw_write(struct regmap *map, unsigned int reg,
                      const void *val, size_t val_len)
 {
+        size_t val_count = val_len / map->format.val_bytes;
         int ret;
 
-        WARN_ON(map->cache_type != REGCACHE_NONE);
+        WARN_ON(!regmap_volatile_range(map, reg, val_count) &&
+                map->cache_type != REGCACHE_NONE);
 
         mutex_lock(&map->lock);