regulator: sy8824x: add SY20278 support

The differences between SY8824C and SY20278 are different regs
for mode/enable.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Link: https://lore.kernel.org/r/20190827163830.2c94f29b@xhacker.debian
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/sy8824x.c

@@ -180,6 +180,15 @@ static const struct sy8824_config sy20276_cfg = {
 	.vsel_count = 128,
 };
 
+static const struct sy8824_config sy20278_cfg = {
+	.vol_reg = 0x00,
+	.mode_reg = 0x01,
+	.enable_reg = 0x01,
+	.vsel_min = 762500,
+	.vsel_step = 12500,
+	.vsel_count = 64,
+};
+
 static const struct of_device_id sy8824_dt_ids[] = {
 	{
 		.compatible = "silergy,sy8824c",
@@ -193,6 +202,10 @@ static const struct of_device_id sy8824_dt_ids[] = {
 		.compatible = "silergy,sy20276",
 		.data = &sy20276_cfg
 	},
+	{
+		.compatible = "silergy,sy20278",
+		.data = &sy20278_cfg
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, sy8824_dt_ids);