diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index 4b8d3002c..1091973b2 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,18 @@
+2012-07-31  Chao-Ying Fu  <fu@mips.com>
+            Catherine Moore  <clm@codesourcery.com>
+            Maciej W. Rozycki  <macro@codesourcery.com>
+
+	* mips.h: Document microMIPS DSP ASE usage.
+	(MICROMIPSOP_MASK_DSPACC, MICROMIPSOP_SH_DSPACC): Update for
+	microMIPS DSP ASE support.
+	(MICROMIPSOP_MASK_DSPSFT, MICROMIPSOP_SH_DSPSFT): Likewise.
+	(MICROMIPSOP_MASK_SA3, MICROMIPSOP_SH_SA3): Likewise.
+	(MICROMIPSOP_MASK_SA4, MICROMIPSOP_SH_SA4): Likewise.
+	(MICROMIPSOP_MASK_IMM8, MICROMIPSOP_SH_IMM8): Likewise.
+	(MICROMIPSOP_MASK_IMM10, MICROMIPSOP_SH_IMM10): Likewise.
+	(MICROMIPSOP_MASK_WRDSP, MICROMIPSOP_SH_WRDSP): Likewise.
+	(MICROMIPSOP_MASK_BP, MICROMIPSOP_SH_BP): Likewise.
+
 2012-07-06  Maciej W. Rozycki  <macro@codesourcery.com>
 
 	* mips.h: Fix a typo in description.
diff --git a/include/opcode/mips.h b/include/opcode/mips.h
index 92325080b..857fc7173 100644
--- a/include/opcode/mips.h
+++ b/include/opcode/mips.h
@@ -1494,6 +1494,24 @@ extern const int bfd_mips16_num_opcodes;
 #define MICROMIPSOP_MASK_IMMY		0x1ff
 #define MICROMIPSOP_SH_IMMY		1
 
+/* MIPS DSP ASE */
+#define MICROMIPSOP_MASK_DSPACC		0x3
+#define MICROMIPSOP_SH_DSPACC		14
+#define MICROMIPSOP_MASK_DSPSFT		0x3f
+#define MICROMIPSOP_SH_DSPSFT		16
+#define MICROMIPSOP_MASK_SA3		0x7
+#define MICROMIPSOP_SH_SA3		13
+#define MICROMIPSOP_MASK_SA4		0xf
+#define MICROMIPSOP_SH_SA4		12
+#define MICROMIPSOP_MASK_IMM8		0xff
+#define MICROMIPSOP_SH_IMM8		13
+#define MICROMIPSOP_MASK_IMM10		0x3ff
+#define MICROMIPSOP_SH_IMM10		16
+#define MICROMIPSOP_MASK_WRDSP		0x3f
+#define MICROMIPSOP_SH_WRDSP		14
+#define MICROMIPSOP_MASK_BP		0x3
+#define MICROMIPSOP_SH_BP		14
+
 /* Placeholders for fields that only exist in the traditional 32-bit
    instruction encoding; see the comment above for details.  */
 #define MICROMIPSOP_MASK_CODE20		0
@@ -1508,28 +1526,12 @@ extern const int bfd_mips16_num_opcodes;
 #define MICROMIPSOP_SH_VECBYTE		0
 #define MICROMIPSOP_MASK_VECALIGN	0
 #define MICROMIPSOP_SH_VECALIGN		0
-#define MICROMIPSOP_MASK_DSPACC	 	0
-#define MICROMIPSOP_SH_DSPACC		0
 #define MICROMIPSOP_MASK_DSPACC_S	0
 #define MICROMIPSOP_SH_DSPACC_S	 	0
-#define MICROMIPSOP_MASK_DSPSFT	 	0
-#define MICROMIPSOP_SH_DSPSFT		0
 #define MICROMIPSOP_MASK_DSPSFT_7	0
 #define MICROMIPSOP_SH_DSPSFT_7	 	0
-#define MICROMIPSOP_MASK_SA3		0
-#define MICROMIPSOP_SH_SA3		0
-#define MICROMIPSOP_MASK_SA4		0
-#define MICROMIPSOP_SH_SA4		0
-#define MICROMIPSOP_MASK_IMM8		0
-#define MICROMIPSOP_SH_IMM8		0
-#define MICROMIPSOP_MASK_IMM10		0
-#define MICROMIPSOP_SH_IMM10		0
-#define MICROMIPSOP_MASK_WRDSP		0
-#define MICROMIPSOP_SH_WRDSP		0
 #define MICROMIPSOP_MASK_RDDSP		0
 #define MICROMIPSOP_SH_RDDSP		0
-#define MICROMIPSOP_MASK_BP		0
-#define MICROMIPSOP_SH_BP		0
 #define MICROMIPSOP_MASK_MT_U		0
 #define MICROMIPSOP_SH_MT_U		0
 #define MICROMIPSOP_MASK_MT_H		0
@@ -1702,6 +1704,18 @@ extern const int bfd_mips16_num_opcodes;
    "f" 32-bit floating point constant
    "l" 32-bit floating point constant in .lit4
 
+   DSP ASE usage:
+   "2" 2-bit unsigned immediate for byte align (MICROMIPSOP_*_BP)
+   "3" 3-bit unsigned immediate (MICROMIPSOP_*_SA3)
+   "4" 4-bit unsigned immediate (MICROMIPSOP_*_SA4)
+   "5" 8-bit unsigned immediate (MICROMIPSOP_*_IMM8)
+   "6" 5-bit unsigned immediate (MICROMIPSOP_*_RS)
+   "7" 2-bit DSP accumulator register (MICROMIPSOP_*_DSPACC)
+   "8" 6-bit unsigned immediate (MICROMIPSOP_*_WRDSP)
+   "0" 6-bit signed immediate (MICROMIPSOP_*_DSPSFT)
+   "@" 10-bit signed immediate (MICROMIPSOP_*_IMM10)
+   "^" 5-bit unsigned immediate (MICROMIPSOP_*_RD)
+
    Other:
    "()" parens surrounding optional value
    ","  separates operands
@@ -1709,8 +1723,8 @@ extern const int bfd_mips16_num_opcodes;
    "m"  start of microMIPS extension sequence
 
    Characters used so far, for quick reference when adding more:
-   "1234567890"
-   "<>(),+.\|~"
+   "12345678 0"
+   "<>(),+.@\^|~"
    "ABCDEFGHI KLMN   RST V    "
    "abcd f hijklmnopqrstuvw yz"