i2c: add 'single-master' property to generic bindings

It is useful to know if we are the only master on a given bus. Because
this is a HW description of the bus, add it to the generic bindings.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index 819436b48faefe47ee1cbe366520999486661be4..438ae123107e7752a5fa5c58affc7b35fab1b423 100644 (file)
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -70,7 +70,12 @@ wants to support one of the below features, it should adapt these bindings.
 - multi-master
        states that there is another master active on this bus. The OS can use
        this information to adapt power management to keep the arbitration awake
-       all the time, for example.
+       all the time, for example. Can not be combined with 'single-master'.
+
+- single-master
+       states that there is no other master active on this bus. The OS can use
+       this information to detect a stalled bus more reliably, for example.
+       Can not be combined with 'multi-master'.
 
 Required properties (per child device)
 --------------------------------------