Merge remote-tracking branch 'xtensa/for_next'

[karo-tx-linux.git] / Documentation / rapidio / sysfs.txt

diff --git a/Documentation/rapidio/sysfs.txt b/Documentation/rapidio/sysfs.txt
index 97f71ce575d65c08652788c95746d47d975e02d0..19878179da4c78657967868fc36ce2abe35aae94 100644 (file)
--- a/Documentation/rapidio/sysfs.txt
+++ b/Documentation/rapidio/sysfs.txt
@@ -88,3 +88,20 @@ that exports additional attributes.
 
 IDT_GEN2:
  errlog - reads contents of device error log until it is empty.
+
+
+5. RapidIO Bus Attributes
+-------------------------
+
+RapidIO bus subdirectory /sys/bus/rapidio implements the following bus-specific
+attribute:
+
+  scan - allows to trigger enumeration discovery process from user space. This
+        is a write-only attribute. To initiate an enumeration or discovery
+        process on specific mport device, a user needs to write mport_ID (not
+        RapidIO destination ID) into this file. The mport_ID is a sequential
+        number (0 ... RIO_MAX_MPORTS) assigned to the mport device.
+        For example, for a machine with a single RapidIO controller, mport_ID
+        for that controller always will be 0.
+        To initiate RapidIO enumeration/discovery on all available mports
+        a user must write '-1' (or RIO_MPORT_ANY) into this attribute file.