regulator: rt5739: Enable REGCACHE_MAPLE

Enable regmap cache to reduce i2c transactions and corresponding
interrupts if regulator is accessed frequently.

Signed-off-by: Jisheng Zhang <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: xhackerustc

drivers/regulator/rt5739.c

@@ -24,6 +24,8 @@
 #define RT5739_REG_NSEL1	0x01
 #define RT5739_REG_CNTL1	0x02
 #define RT5739_REG_ID1		0x03
+#define RT5739_REG_ID2		0x04
+#define RT5739_REG_MON		0x05
 #define RT5739_REG_CNTL2	0x06
 #define RT5739_REG_CNTL4	0x08
 
@@ -236,11 +238,18 @@ static void rt5739_init_regulator_desc(struct regulator_desc *desc,
 	}
 }
 
+static bool rt5739_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return reg == RT5739_REG_MON;
+}
+
 static const struct regmap_config rt5739_regmap_config = {
 	.name = "rt5739",
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = RT5739_REG_CNTL4,
+	.cache_type = REGCACHE_MAPLE,
+	.volatile_reg = rt5739_volatile_reg,
 };
 
 static int rt5739_probe(struct i2c_client *i2c)