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Diffstat (limited to 'Documentation/driver-api/gpio/intro.rst')
| -rw-r--r-- | Documentation/driver-api/gpio/intro.rst | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/driver-api/gpio/intro.rst b/Documentation/driver-api/gpio/intro.rst index 74591489d0b5..94dd7185e76e 100644 --- a/Documentation/driver-api/gpio/intro.rst +++ b/Documentation/driver-api/gpio/intro.rst @@ -106,11 +106,11 @@ don't. When you need open drain signaling but your hardware doesn't directly support it, there's a common idiom you can use to emulate it with any GPIO pin that can be used as either an input or an output: - LOW: gpiod_direction_output(gpio, 0) ... this drives the signal and overrides - the pullup. + **LOW**: ``gpiod_direction_output(gpio, 0)`` ... this drives the signal and + overrides the pullup. - HIGH: gpiod_direction_input(gpio) ... this turns off the output, so the pullup - (or some other device) controls the signal. + **HIGH**: ``gpiod_direction_input(gpio)`` ... this turns off the output, so + the pullup (or some other device) controls the signal. The same logic can be applied to emulate open source signaling, by driving the high signal and configuring the GPIO as input for low. This open drain/open |