2 files changed, 3 insertions, 0 deletions
diff --git a/sys/include/dev/ic/ahciregs.h b/sys/include/dev/ic/ahciregs.h
index 2f2fa84..f73e587 100644
--- a/sys/include/dev/ic/ahciregs.h
+++ b/sys/include/dev/ic/ahciregs.h
@@ -126,6 +126,7 @@ struct hba_memspace {
 #define AHCI_CAP_NCS(CAP) ((CAP >> 8) & 0x1F)   /* Number of command slots */
 #define AHCI_CAP_EMS(CAP) ((CAP >> 6) & 1)      /* Enclosure management support */
 #define AHCI_CAP_SAL(CAP) ((CAP >> 25) & 1)     /* Supports activity LED */
+#define AHCI_CAP_SSS(CAP) ((CAP >> 27) & 1)     /* Supports staggered spin up */
 
 /*
  * Device detection (DET) and Interface power
diff --git a/sys/include/dev/ic/ahcivar.h b/sys/include/dev/ic/ahcivar.h
index 4b6cf12..dc4e492 100644
--- a/sys/include/dev/ic/ahcivar.h
+++ b/sys/include/dev/ic/ahcivar.h
@@ -45,6 +45,7 @@ struct ahci_cmd_hdr;
  * @nslots: Number of command slots
  * @ems: Enclosure management support
  * @sal: Supports activity LED
+ * @sss: Supports staggered spin up
  */
 struct ahci_hba {
     struct hba_memspace *io;
@@ -53,6 +54,7 @@ struct ahci_hba {
     uint32_t nslots;
     uint8_t ems  : 1;
     uint8_t sal  : 1;
+    uint8_t sss  : 1;
 };
 
 /*