digsy mtc: Add description to GPIO initial configuration.

Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>

diff --git a/include/configs/digsy_mtc.h b/include/configs/digsy_mtc.h
index 0cc2a8d992fffd12b285810db72013422d12905c..558010fa75e05b0284c38779ca14aeac380c8ae5 100644 (file)
--- a/include/configs/digsy_mtc.h
+++ b/include/configs/digsy_mtc.h
@@ -248,6 +248,22 @@
 
 /*
  * GPIO configuration
+ * use pin gpio_wkup_6 as second SDRAM chip select (mem_cs1)
+ *  Bit 0   (mask 0x80000000) : 0x1
+ * SPI on Tmr2/3/4/5 pins
+ *  Bit 2:3 (mask 0x30000000) : 0x2
+ * ATA cs0/1 on csb_4/5
+ *  Bit 6:7 (mask 0x03000000) : 0x2
+ * Ethernet 100Mbit with MD
+ *  Bits 12:15 (mask 0x000f0000): 0x5
+ * USB - Two UARTs
+ *  Bits 18:19 (mask 0x00003000) : 0x2
+ * PSC3 - USB2 on PSC3
+ *  Bits 20:23 (mask 0x00000f00) : 0x1
+ * PSC2 - CAN1&2 on PSC2 pins
+ *  Bits 25:27 (mask 0x00000070) : 0x1
+ * PSC1 - AC97 functionality
+ *  Bits 29:31 (mask 0x00000007) : 0x2
  */
 #define CONFIG_SYS_GPS_PORT_CONFIG     0xA2552112