sound: oxygen: more hardware documentation
Add some comments describing the hardware pin routing.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/oxygen/xonar_pcm179x.c b/sound/pci/oxygen/xonar_pcm179x.c
index 07aaa89..97574db 100644
--- a/sound/pci/oxygen/xonar_pcm179x.c
+++ b/sound/pci/oxygen/xonar_pcm179x.c
@@ -32,6 +32,10 @@
* GPIO 5 <- external power present (D2X only)
* GPIO 7 -> ALT
* GPIO 8 -> enable output to speakers
+ *
+ * CM9780:
+ *
+ * GPO 0 -> route line-in (0) or AC97 output (1) to CS5381 input
*/
/*
@@ -54,6 +58,10 @@
*
* PCM1796 front: AD1,0 <- 0,0
*
+ * CM9780:
+ *
+ * GPO 0 -> route line-in (0) or AC97 output (1) to CS5381 input
+ *
* no daughterboard
* ----------------
*
@@ -107,6 +115,15 @@
* PCM1792A:
*
* AD1,0 <- 0,0
+ * SCK <- CLK_OUT of CS2000 (ST only)
+ *
+ * CS2000:
+ *
+ * AD0 <- 0
+ *
+ * CM9780:
+ *
+ * GPO 0 -> route line-in (0) or AC97 output (1) to CS5381 input
*
* H6 daughterboard
* ----------------