ARM: dts: gose: enable sound DMA support via DVC in device tree

Enable DMA transfer using DVC in r8a7793/gose device tree.

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

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

Based on similar work for the r8a7791/koelsch by Kuninori Morimoto.

Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/arch/arm/boot/dts/r8a7793-gose.dts b/arch/arm/boot/dts/r8a7793-gose.dts
index 17c87fe0944f6021d11a70dbf8b77dd0703e073d..2fa052036dbc00401da21fada3c0fd4ed319a930 100644 (file)
--- a/arch/arm/boot/dts/r8a7793-gose.dts
+++ b/arch/arm/boot/dts/r8a7793-gose.dts
@@ -18,7 +18,24 @@
  * This command is required when Playback/Capture
  *
  *     amixer set "LINEOUT Mixer DACL" on
+ *     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 "r8a7793.dtsi"
 #include <dt-bindings/gpio/gpio.h>
@@ -401,8 +418,8 @@
 
        rcar_sound,dai {
                dai0 {
-                       playback = <&ssi0 &src2>;
-                       capture  = <&ssi1 &src3>;
+                       playback = <&ssi0 &src2 &dvc0>;
+                       capture  = <&ssi1 &src3 &dvc1>;
                };
        };
 };