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@xxxxxxxxxxx>
Acked-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
---
arch/arm/boot/dts/r8a7793-gose.dts | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/arch/arm/boot/dts/r8a7793-gose.dts b/arch/arm/boot/dts/r8a7793-gose.dts
index 17c87fe0944f..2fa052036dbc 100644
--- 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>;
};
};
};
--
2.7.0.rc3.207.g0ac5344
