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pinconf-generic: clarify pull up and pull down config values

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PIN_CONFIG_BIAS_PULL_DOWN and PIN_CONFIG_BIAS_PULL_UP values can
be custom or an SI unit such as ohms

Signed-off-by: Niyas Sait <niyas.sait@linaro.org>
Link: https://lore.kernel.org/r/20221115175415.650690-3-niyas.sait@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Niyas Sait 2022-11-15 17:54:14 +00:00 committed by Linus Walleij
parent 457ff9fb29
commit 196270c5d6
1 changed files with 4 additions and 2 deletions
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6
include/linux/pinctrl/pinconf-generic.h
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@ -38,7 +38,8 @@ struct pinctrl_map;
* impedance.
* @PIN_CONFIG_BIAS_PULL_DOWN: the pin will be pulled down (usually with high
* impedance to GROUND). If the argument is != 0 pull-down is enabled,
* if it is 0, pull-down is total, i.e. the pin is connected to GROUND.
* the value is interpreted by the driver and can be custom or an SI unit
* such as ohms.
* @PIN_CONFIG_BIAS_PULL_PIN_DEFAULT: the pin will be pulled up or down based
* on embedded knowledge of the controller hardware, like current mux
* function. The pull direction and possibly strength too will normally
@ -49,7 +50,8 @@ struct pinctrl_map;
* @PIN_CONFIG_BIAS_DISABLE.
* @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high
* impedance to VDD). If the argument is != 0 pull-up is enabled,
* if it is 0, pull-up is total, i.e. the pin is connected to VDD.
* the value is interpreted by the driver and can be custom or an SI unit
* such as ohms.
* @PIN_CONFIG_DRIVE_OPEN_DRAIN: the pin will be driven with open drain (open
* collector) which means it is usually wired with other output ports
* which are then pulled up with an external resistor. Setting this