diff options
| -rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio.txt | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio.txt b/Documentation/devicetree/bindings/gpio/gpio.txt index 2209c163f2a5..bccb862398db 100644 --- a/Documentation/devicetree/bindings/gpio/gpio.txt +++ b/Documentation/devicetree/bindings/gpio/gpio.txt @@ -74,11 +74,12 @@ GPIO pin number, and GPIO flags as accepted by the "qe_pio_e" gpio-controller. Optional standard bitfield specifiers for the last cell: - Bit 0: 0 means active high, 1 means active low -- Bit 1: 1 means single-ended wiring, see: +- Bit 1: 0 mean push-pull wiring, see: + https://en.wikipedia.org/wiki/Push-pull_output + 1 means single-ended wiring, see: https://en.wikipedia.org/wiki/Single-ended_triode - When used with active-low, this means open drain/collector, see: +- Bit 2: 0 means open-source, 1 means open drain, see: https://en.wikipedia.org/wiki/Open_collector - When used with active-high, this means open source/emitter 1.1) GPIO specifier best practices ---------------------------------- |