ASoC: mediatek: add documents for btcvsd driver

document for btcvsd driver

Signed-off-by: KaiChieh Chuang <kaichieh.chuang@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/mtk-btcvsd-snd.txt b/Documentation/devicetree/bindings/sound/mtk-btcvsd-snd.txt
new file mode 100644 (file)
index 0000000..679e448
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/mtk-btcvsd-snd.txt
@@ -0,0 +1,24 @@
+Mediatek ALSA BT SCO CVSD/MSBC Driver
+
+Required properties:
+- compatible = "mediatek,mtk-btcvsd-snd";
+- reg: register location and size of PKV and SRAM_BANK2
+- interrupts: should contain BTSCO interrupt
+- mediatek,infracfg: the phandles of INFRASYS
+- mediatek,offset: Array contains of register offset and mask
+    infra_misc_offset,
+    infra_conn_bt_cvsd_mask,
+    cvsd_mcu_read_offset,
+    cvsd_mcu_write_offset,
+    cvsd_packet_indicator_offset
+
+Example:
+
+       mtk-btcvsd-snd@18000000 {
+               compatible = "mediatek,mtk-btcvsd-snd";
+               reg=<0 0x18000000 0 0x1000>,
+                   <0 0x18080000 0 0x8000>;
+               interrupts = <GIC_SPI 286 IRQ_TYPE_LEVEL_LOW>;
+               mediatek,infracfg = <&infrasys>;
+               mediatek,offset = <0xf00 0x800 0xfd0 0xfd4 0xfd8>;
+       };