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Subject[PATCH v3 16/16] switchtec_ntb: update switchtec documentation with notes for NTB
The switchtec_ntb driver has a couple requirements on the switchec's
hardware configuration so we add these notes to the documentation.

Signed-off-by: Logan Gunthorpe <>
Reviewed-by: Stephen Bates <>
Reviewed-by: Kurt Schwemmer <>
Documentation/switchtec.txt | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/Documentation/switchtec.txt b/Documentation/switchtec.txt
index a0a9c7b3d4d5..f788264921ff 100644
--- a/Documentation/switchtec.txt
+++ b/Documentation/switchtec.txt
@@ -78,3 +78,15 @@ The following IOCTLs are also supported by the device:
between PCI Function Framework number (used by the event system)
and Switchtec Logic Port ID and Partition number (which is more
user friendly).
+Non-Transparent Bridge (NTB) Driver
+An NTB driver is provided for the switchtec hardware in switchtec_ntb.
+Currently, it only supports switches configured with exactly 2
+partitions. It also requires the following configuration settings:
+* Both partitions must be able to access each other's GAS spaces.
+ Thus, the bits in the GAS Access Vector under Management Settings
+ must be set to support this.
 \ /
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