imx233: add the possibility to choose audio output coupling mode

via target-defined option

Change-Id: I1bffbc7f17a11cf690a771057c2e4a7ba6a5faaa
Reviewed-on: http://gerrit.rockbox.org/678
Reviewed-by: Amaury Pouly <amaury.pouly@gmail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/firmware/target/arm/imx233/audioout-imx233.h b/firmware/target/arm/imx233/audioout-imx233.h
index b5c16767c6..88163e7ad2 100644
--- a/firmware/target/arm/imx233/audioout-imx233.h
+++ b/firmware/target/arm/imx233/audioout-imx233.h
@@ -27,6 +27,14 @@
 
 #include "regs/regs-audioout.h"
 
+/* target-defined output stage coupling method
+ * its setting is IMX233_AUDIO_COUPLING_MODE and must be set for every target
+ * Use ACM_CAP if output stage (i.e. headphones) have output capacitors,
+ * ACM_CAPLESS (DC-coupled) otherwise.
+ */
+#define ACM_CAPLESS    0
+#define ACM_CAP        1
+
 struct imx233_audioout_info_t
 {
     // NOTE there is a convention here: dac -> dacvol -> dacmute