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Subject[PATCH 3/3] ARM: dts: r8a7742-iwg21d-q7: Sound DMA support via DVC on DTS
Date
Enable sound with DMA support on carrier board.

DMA transfer uses DVC

DMA DMApp
[MEM] -> [SRC] -> [DVC] -> [SSIU] -> [SSI]

DMA DMApp
[MEM] <- [DVC] <- [SRC] <- [SSIU] <- [SSI]

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
---
arch/arm/boot/dts/r8a7742-iwg21d-q7.dts | 63 +++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)

diff --git a/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts b/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
index d6154fd..704fe22 100644
--- a/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
+++ b/arch/arm/boot/dts/r8a7742-iwg21d-q7.dts
@@ -5,6 +5,29 @@
* Copyright (C) 2020 Renesas Electronics Corp.
*/

+/*
+ * SSI-SGTL5000
+ *
+ * This command is required when Playback/Capture
+ *
+ * amixer set "DVC Out" 100%
+ * amixer set "DVC In" 100%
+ *
+ * You can use Mute
+ *
+ * amixer set "DVC Out Mute" on
+ * amixer set "DVC In Mute" on
+ *
+ * You can use Volume Ramp
+ *
+ * amixer set "DVC Out Ramp Up Rate" "0.125 dB/64 steps"
+ * amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
+ * amixer set "DVC Out Ramp" on
+ * aplay xxx.wav &
+ * amixer set "DVC Out" 80% // Volume Down
+ * amixer set "DVC Out" 100% // Volume Up
+ */
+
/dts-v1/;
#include "r8a7742-iwg21m.dtsi"

@@ -37,6 +60,21 @@
regulator-always-on;
};

+ rsnd_sgtl5000: sound {
+ compatible = "simple-audio-card";
+ simple-audio-card,format = "i2s";
+ simple-audio-card,bitclock-master = <&sndcodec>;
+ simple-audio-card,frame-master = <&sndcodec>;
+
+ sndcpu: simple-audio-card,cpu {
+ sound-dai = <&rcar_sound>;
+ };
+
+ sndcodec: simple-audio-card,codec {
+ sound-dai = <&sgtl5000>;
+ };
+ };
+
vcc_sdhi2: regulator-vcc-sdhi2 {
compatible = "regulator-fixed";

@@ -152,6 +190,11 @@
power-source = <1800>;
};

+ sound_pins: sound {
+ groups = "ssi34_ctrl", "ssi3_data", "ssi4_data";
+ function = "ssi";
+ };
+
usb0_pins: usb0 {
groups = "usb0";
function = "usb0";
@@ -168,6 +211,22 @@
};
};

+&rcar_sound {
+ pinctrl-0 = <&sound_pins>;
+ pinctrl-names = "default";
+ status = "okay";
+
+ /* Single DAI */
+ #sound-dai-cells = <0>;
+
+ rcar_sound,dai {
+ dai0 {
+ playback = <&ssi4 &src4 &dvc1>;
+ capture = <&ssi3 &src3 &dvc0>;
+ };
+ };
+};
+
&rwdt {
timeout-sec = <60>;
status = "okay";
@@ -201,6 +260,10 @@
status = "okay";
};

+&ssi4 {
+ shared-pin;
+};
+
&usbphy {
status = "okay";
};
--
2.7.4
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