sound: oxygen: more hardware documentation

Add some comments describing the hardware pin routing.
Signed-off-by: NClemens Ladisch <clemens@ladisch.de>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/oxygen/hifier.c

@@ -17,6 +17,12 @@
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
+/*
+ * CMI8788:
+ *
+ * SPI 0 -> AK4396
+ */
+
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include <sound/control.h>

sound/pci/oxygen/oxygen.c

@@ -18,6 +18,8 @@
  */
 
 /*
+ * CMI8788:
+ *
  * SPI 0 -> 1st AK4396 (front)
  * SPI 1 -> 2nd AK4396 (surround)
  * SPI 2 -> 3rd AK4396 (center/LFE)
@@ -27,6 +29,10 @@
  * GPIO 0 -> DFS0 of AK5385
  * GPIO 1 -> DFS1 of AK5385
  * GPIO 8 -> enable headphone amplifier on HT-Omega models
+ *
+ * CM9780:
+ *
+ * GPO 0 -> route line-in (0) or AC97 output (1) to ADC input
  */
 
 #include <linux/delay.h>

sound/pci/oxygen/xonar_cs43xx.c

@@ -41,6 +41,10 @@
  * CS4362A:
  *
  * AD0 <- 0
+ *
+ * CM9780:
+ *
+ * GPO 0 -> route line-in (0) or AC97 output (1) to CS5361 input
  */
 
 #include <linux/pci.h>

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
  * ----------------