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pinctrl: clean up pinconfig-generic documentation

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Reword the section of pinctrl-bindings.txt that describes generic
properties that pinctrl bindings may use. The aim is to make the text
clearer, and more explicitly call out the responsibility of individual
bindings that use the generic properties to define which of the
properties are used, and how.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Stephen Warren 2013-08-05 15:55:59 -06:00 committed by Linus Walleij
parent 99fce0295e
commit bcd0c8c2d4
1 changed files with 10 additions and 15 deletions
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Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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@ -127,20 +127,16 @@ whether there is any interaction between the child and intermediate parent
nodes, is again defined entirely by the binding for the individual pin
controller device.
== Using generic pinconfig options ==
== Generic pin configuration node content ==
Generic pinconfig parameters can be used by defining a separate node containing
the applicable parameters (and optional values), like:
Many data items that are represented in a pin configuration node are common
and generic. Pin control bindings should use the properties defined below
where they are applicable; not all of these properties are relevant or useful
for all hardware or binding structures. Each individual binding document
should state which of these generic properties, if any, are used, and the
structure of the DT nodes that contain these properties.
pcfg_pull_up: pcfg_pull_up {
bias-pull-up;
drive-strength = <20>;
};
This node should then be referenced in the appropriate pinctrl node as a phandle
and parsed in the driver using the pinconf_generic_parse_dt_config function.
Supported configuration parameters are:
Supported generic properties are:
bias-disable - disable any pin bias
bias-high-impedance - high impedance mode ("third-state", "floating")
@ -160,7 +156,8 @@ low-power-disable - disable low power mode
output-low - set the pin to output mode with low level
output-high - set the pin to output mode with high level
Arguments for parameters:
Some of the generic properties take arguments. For those that do, the
arguments are described below.
- bias-pull-up, -down and -pin-default take as optional argument on hardware
supporting it the pull strength in Ohm. bias-disable will disable the pull.
@ -170,7 +167,5 @@ Arguments for parameters:
- input-debounce takes the debounce time in usec as argument
or 0 to disable debouncing
All parameters not listed here, do not take an argument.
More in-depth documentation on these parameters can be found in
<include/linux/pinctrl/pinconfig-generic.h>