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-rw-r--r--Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt25
1 files changed, 16 insertions, 9 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
index f01d154090da..62d0f33fa65e 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
@@ -204,21 +204,22 @@ each single pin the number of required sub-nodes containing "pin" and
maintain.
For cases like this, the pin controller driver may use the pinmux helper
-property, where the pin identifier is packed with mux configuration settings
-in a single integer.
+property, where the pin identifier is provided with mux configuration settings
+in a pinmux group. A pinmux group consists of the pin identifier and mux
+settings represented as a single integer or an array of integers.
-The pinmux property accepts an array of integers, each of them describing
+The pinmux property accepts an array of pinmux groups, each of them describing
a single pin multiplexing configuration.
pincontroller {
state_0_node_a {
- pinmux = <PIN_ID_AND_MUX>, <PIN_ID_AND_MUX>, ...;
+ pinmux = <PINMUX_GROUP>, <PINMUX_GROUP>, ...;
};
};
Each individual pin controller driver bindings documentation shall specify
-how those values (pin IDs and pin multiplexing configuration) are defined and
-assembled together.
+how pin IDs and pin multiplexing configuration are defined and assembled
+together in a pinmux group.
== Generic pin configuration node content ==
@@ -251,14 +252,20 @@ drive-push-pull - drive actively high and low
drive-open-drain - drive with open drain
drive-open-source - drive with open source
drive-strength - sink or source at most X mA
-input-enable - enable input on pin (no effect on output)
-input-disable - disable input on pin (no effect on output)
+input-enable - enable input on pin (no effect on output, such as
+ enabling an input buffer)
+input-disable - disable input on pin (no effect on output, such as
+ disabling an input buffer)
input-schmitt-enable - enable schmitt-trigger mode
input-schmitt-disable - disable schmitt-trigger mode
input-debounce - debounce mode with debound time X
power-source - select between different power supplies
low-power-enable - enable low power mode
low-power-disable - disable low power mode
+output-disable - disable output on a pin (such as disable an output
+ buffer)
+output-enable - enable output on a pin without actively driving it
+ (such as enabling an output buffer)
output-low - set the pin to output mode with low level
output-high - set the pin to output mode with high level
slew-rate - set the slew rate
@@ -300,7 +307,7 @@ arguments are described below.
- pinmux takes a list of pin IDs and mux settings as required argument. The
specific bindings for the hardware defines:
- How pin IDs and mux settings are defined and assembled together in a single
- integer.
+ integer or an array of integers.
- bias-pull-up, -down and -pin-default take as optional argument on hardware
supporting it the pull strength in Ohm. bias-disable will disable the pull.