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Date:   Wed, 12 Aug 2020 21:31:02 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Support Opensource <support.opensource@...semi.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        Tomasz Figa <tfiga@...omium.org>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Daniel Kurtz <djkurtz@...omium.org>
Subject: [PATCH] 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@...omium.org>
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
 drivers/regulator/da9211-regulator.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c
index 297b3aa7c753..cffcefd0538d 100644
--- 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),
 };
-- 
2.28.0.236.gb10cc79966-goog

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