Signed-off-by: Bastian Stender <bst@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/i2c/i2c-mux-pca954x.txt | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
index 34d91501342e..864ac91f8c1c 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt
@@ -36,6 +36,22 @@ Optional Properties:
- first cell is the pin number
- second cell is used to specify flags.
See also Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+ - mux-locked: If present, explicitly allow unrelated I2C transactions on the
+ parent I2C adapter at these times:
+ + during setup of the multiplexer
+ + between setup of the multiplexer and the child bus I2C transaction
+ + between the child bus I2C transaction and releasing of the multiplexer
+ + during releasing of the multiplexer
+
+ However, I2C transactions to devices behind all I2C multiplexers connected
+ to the same parent adapter that this multiplexer is connected to are blocked
+ for the full duration of the complete multiplexed I2C transaction (i.e.
+ including the times covered by the above list).
+ If mux-locked is not present, the multiplexer is assumed to be parent-locked.
+ This means that no unrelated I2C transactions are allowed on the parent I2C
+ adapter for the complete multiplexed I2C transaction.
+ The properties of mux-locked and parent-locked multiplexers are discussed
+ in more detail in Documentation/i2c/i2c-topology.
Example:
--
2.17.0
