regmap: Allow rbtree to cache zero default values

Ensure that when we start up in cache only mode we can store defaults of
zero, otherwise if the hardware is unavailable we won't be able to read.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>

diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index 887dbce63aff8704cd09fcaf32ccf3dc641b730b..52511f95857a79cc4f399a9a9ed611d4aa113592 100644 (file)
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -252,9 +252,6 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
                regcache_rbtree_set_register(rbnode, reg_tmp, value,
                                             map->cache_word_size);
        } else {
-               /* bail out early, no need to create the rbnode yet */
-               if (!value)
-                       return 0;
                /* look for an adjacent register to the one we are about to add */
                for (node = rb_first(&rbtree_ctx->root); node;
                     node = rb_next(node)) {