regulator: da9211: add cache_type

Add regmap_cache to reduce wakeups events of interrupt if regulator is
accessed frequently. This results in saving more power.

Suggested-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Link: https://lore.kernel.org/r/20200812133101.2513317-1-hsinyi@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c
index 297b3aa7c75320f382bafb7b4cf4e523db0b1d5c..cffcefd0538d5da61e721c4f58088d0d95f6f1a8 100644 (file)
--- a/drivers/regulator/da9211-regulator.c
+++ b/drivers/regulator/da9211-regulator.c
@@ -51,10 +51,24 @@ static const struct regmap_range_cfg da9211_regmap_range[] = {
        },
 };
 
+static bool da9211_volatile_reg(struct device *dev, unsigned int reg)
+{
+       switch (reg) {
+       case DA9211_REG_STATUS_A:
+       case DA9211_REG_STATUS_B:
+       case DA9211_REG_EVENT_A:
+       case DA9211_REG_EVENT_B:
+               return true;
+       }
+       return false;
+}
+
 static const struct regmap_config da9211_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
        .max_register = 5 * 128,
+       .volatile_reg = da9211_volatile_reg,
+       .cache_type = REGCACHE_RBTREE,
        .ranges = da9211_regmap_range,
        .num_ranges = ARRAY_SIZE(da9211_regmap_range),
 };