diff options
| author | Charles Keepax <ckeepax@opensource.wolfsonmicro.com> | 2017-05-23 15:47:28 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-05-29 11:05:34 +0200 |
| commit | f9e3a419aa53d77a9ba348f587775aea726fcafa (patch) | |
| tree | 5fa576d1fa47461146214bfd846d30bd7f736384 /Documentation/devicetree/bindings/gpio/gpio.txt | |
| parent | 6dc0048cff988858254fcc26becfc1e9753efa79 (diff) | |
gpio: of: Reflect decoupling of open collector and active low/high
Commit 4c0facddb7d8 ("gpio: core: Decouple open drain/source flag with
active low/high") decoupled the open collector outputs from active
low/high but did not update the documentation.
Update the device tree documentation to correctly reflect this new
separation between the two concepts.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio.txt')
| -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 ---------------------------------- |