From f9e3a419aa53d77a9ba348f587775aea726fcafa Mon Sep 17 00:00:00 2001 From: Charles Keepax Date: Tue, 23 May 2017 15:47:28 +0100 Subject: [PATCH] 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 Acked-by: Laxman Dewangan Signed-off-by: Linus Walleij --- Documentation/devicetree/bindings/gpio/gpio.txt | 7 ++++--- 1 file 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 ---------------------------------- -- 2.39.5