regulator: tps6287x-regulator: Enable REGCACHE_MAPLE

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

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

drivers/regulator/tps6287x-regulator.c

···
 #define TPS6287X_CTRL3		0x03
 #define TPS6287X_STATUS		0x04
 
+static bool tps6287x_volatile_reg(struct device *dev, unsigned int reg)
+{
+	return reg == TPS6287X_STATUS;
+}
+
 static const struct regmap_config tps6287x_regmap_config = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.max_register = TPS6287X_STATUS,
+	.cache_type = REGCACHE_MAPLE,
+	.volatile_reg = tps6287x_volatile_reg,
 };
 
 static const struct linear_range tps6287x_voltage_ranges[] = {