| Message ID | 20220201001810.19516-3-zev@bewilderbeest.net |
|---|---|
| State | New |
| Headers | show |
| Series | ic2: mux: pca9541: add delayed-release support | expand |
On Mon, 31 Jan 2022 16:18:10 -0800, Zev Weiss wrote: > This property can be used to reduce arbitration overhead on busy i2c > busses by retaining ownership for a brief period in anticipation of > another transaction in the near future. > > Signed-off-by: Zev Weiss <zev@bewilderbeest.net> > --- > Documentation/devicetree/bindings/i2c/nxp,pca9541.txt | 9 +++++++++ > 1 file changed, 9 insertions(+) > Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt b/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt index 42bfc09c8918..9e8819593271 100644 --- a/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt +++ b/Documentation/devicetree/bindings/i2c/nxp,pca9541.txt @@ -6,6 +6,14 @@ Required Properties: - reg: The I2C address of the device. +Optional Properties: + + - release-delay-us: the number of microseconds to delay before + releasing the bus after a transaction. If unspecified the default + is zero (the bus is released immediately). Non-zero values can + reduce arbitration overhead for back-to-back transactions, at the + cost of delaying the other master's access to the bus. + The following required properties are defined externally: - I2C arbitration bus node. See i2c-arb.txt in this directory. @@ -16,6 +24,7 @@ Example: i2c-arbitrator@74 { compatible = "nxp,pca9541"; reg = <0x74>; + release-delay-us = <20000>; i2c-arb { #address-cells = <1>;
This property can be used to reduce arbitration overhead on busy i2c busses by retaining ownership for a brief period in anticipation of another transaction in the near future. Signed-off-by: Zev Weiss <zev@bewilderbeest.net> --- Documentation/devicetree/bindings/i2c/nxp,pca9541.txt | 9 +++++++++ 1 file changed, 9 insertions(+)