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Subject[PATCH 1/3] s390/docs: mention subchannel types
Date
Since the original inception of the s390-drivers document, the
common I/O layer has grown support for more types of subchannels.
Give at least a pointer for the various types.

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
---
Documentation/driver-api/s390-drivers.rst | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/Documentation/driver-api/s390-drivers.rst b/Documentation/driver-api/s390-drivers.rst
index ecf8851d3565..42350f21357d 100644
--- a/Documentation/driver-api/s390-drivers.rst
+++ b/Documentation/driver-api/s390-drivers.rst
@@ -22,9 +22,28 @@ While most I/O devices on a s390 system are typically driven through the
channel I/O mechanism described here, there are various other methods
(like the diag interface). These are out of the scope of this document.

+The s390 common I/O layer also provides access to some devices that are
+not strictly considered I/O devices. They are considered here as well,
+although they are not the focus of this document.
+
Some additional information can also be found in the kernel source under
Documentation/s390/driver-model.txt.

+The css bus
+===========
+
+The css bus contains the subchannels available on the system. They fall
+into several categories:
+
+* Standard I/O subchannels, for use by the system. They have a child
+ device on the ccw bus and are described below.
+* I/O subchannels bound to the vfio-ccw driver. See
+ Documentation/s390/vfio-ccw.txt.
+* Message subchannels. No Linux driver currently exists.
+* CHSC subchannels (at most one). The chsc subchannel driver can be used
+ to send asynchronous chsc commands.
+* eADM subchannels. Used for talking to storage class memory.
+
The ccw bus
===========

--
2.13.6
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