Describe the new ID register in line with DDI0601 2024-09.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 arch/arm64/tools/sysreg | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg
index 8d637ac4b7c6..5670e51a6f90 100644
--- a/arch/arm64/tools/sysreg
+++ b/arch/arm64/tools/sysreg
@@ -1287,6 +1287,32 @@ Field	15:8	BRPs
 Field	7:0	SYSPMUID
 EndSysreg
 
+Sysreg	ID_AA64DFR2_EL1	3	0	0	5	2
+Res0	63:28
+UnsignedEnum	27:24	TRBE_EXC
+	0b0000	NI
+	0b0001	IMP
+EndEnum
+UnsignedEnum	23:20	SPE_nVM
+	0b0000	NI
+	0b0001	IMP
+EndEnum
+UnsignedEnum	19:16	SPE_EXC
+	0b0000	NI
+	0b0001	IMP
+EndEnum
+Res0	15:8
+UnsignedEnum	7:4	BWE
+	0b0000	NI
+	0b0001	FEAT_BWE
+	0b0002	FEAT_BWE2
+EndEnum
+UnsignedEnum	3:0	STEP
+	0b0000	NI
+	0b0001	IMP
+EndEnum
+EndSysreg
+
 Sysreg	ID_AA64AFR0_EL1	3	0	0	5	4
 Res0	63:32
 Field	31:28	IMPDEF7
-- 
2.47.0.163.g1226f6d8fa-goog