[Feature]add MT2731_MP2_MR2_SVN388 baseline version

Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/include/sound/l3.h b/src/kernel/linux/v4.14/include/sound/l3.h
new file mode 100644
index 0000000..b6f5807
--- /dev/null
+++ b/src/kernel/linux/v4.14/include/sound/l3.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _L3_H_
+#define _L3_H_ 1
+
+struct l3_pins {
+	void (*setdat)(struct l3_pins *, int);
+	void (*setclk)(struct l3_pins *, int);
+	void (*setmode)(struct l3_pins *, int);
+
+	int gpio_data;
+	int gpio_clk;
+	int gpio_mode;
+	int use_gpios;
+
+	int data_hold;
+	int data_setup;
+	int clock_high;
+	int mode_hold;
+	int mode;
+	int mode_setup;
+};
+
+struct device;
+
+int l3_write(struct l3_pins *adap, u8 addr, u8 *data, int len);
+int l3_set_gpio_ops(struct device *dev, struct l3_pins *adap);
+
+#endif