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| author | Jacopo Mondi <jacopo+renesas@jmondi.org> | 2017-06-22 12:00:58 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-06-29 14:30:49 +0200 |
| commit | 425562429d4f3b134c7390249c23a3f647aad199 (patch) | |
| tree | 2756f507c79f1bc5806386795121f575ed27ab3d /include/linux/pinctrl | |
| parent | 61830619675b97d3da34c59c71ae51646a205e2c (diff) | |
| download | lwn-425562429d4f3b134c7390249c23a3f647aad199.tar.gz lwn-425562429d4f3b134c7390249c23a3f647aad199.zip | |
pinctrl: generic: Add output-enable property
Add output-enable generic pin configuration property.
This properties allows enabling/disabling pin's output capabilities
without actually driving any value on the line.
Acked-by: Rob Herring <robh@kernel.org>
[Added inline elaborations on buffer enabling/disabling]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/pinctrl')
| -rw-r--r-- | include/linux/pinctrl/pinconf-generic.h | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h index 7620eb127cff..231d3075815a 100644 --- a/include/linux/pinctrl/pinconf-generic.h +++ b/include/linux/pinctrl/pinconf-generic.h @@ -73,10 +73,16 @@ * operation, if several modes of operation are supported these can be * passed in the argument on a custom form, else just use argument 1 * to indicate low power mode, argument 0 turns low power mode off. - * @PIN_CONFIG_OUTPUT: this will configure the pin as an output. Use argument - * 1 to indicate high level, argument 0 to indicate low level. (Please - * see Documentation/pinctrl.txt, section "GPIO mode pitfalls" for a - * discussion around this parameter.) + * @PIN_CONFIG_OUTPUT_ENABLE: this will enable the pin's output mode + * without driving a value there. For most platforms this reduces to + * enable the output buffers and then let the pin controller current + * configuration (eg. the currently selected mux function) drive values on + * the line. Use argument 1 to enable output mode, argument 0 to disable + * it. + * @PIN_CONFIG_OUTPUT: this will configure the pin as an output and drive a + * value on the line. Use argument 1 to indicate high level, argument 0 to + * indicate low level. (Please see Documentation/pinctrl.txt, section + * "GPIO mode pitfalls" for a discussion around this parameter.) * @PIN_CONFIG_POWER_SOURCE: if the pin can select between different power * supplies, the argument to this parameter (on a custom format) tells * the driver which alternative power source to use. @@ -105,6 +111,7 @@ enum pin_config_param { PIN_CONFIG_INPUT_SCHMITT, PIN_CONFIG_INPUT_SCHMITT_ENABLE, PIN_CONFIG_LOW_POWER_MODE, + PIN_CONFIG_OUTPUT_ENABLE, PIN_CONFIG_OUTPUT, PIN_CONFIG_POWER_SOURCE, PIN_CONFIG_SLEW_RATE, |