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dt-bindings: pinctrl: add a 'pinctrl-use-default' property 

Pin setup may be optional in some cases such as the reset default works
or the pin setup is done by the bootloader. In these cases, it is optional
for the OS to support managing the pin controller and pin setup. In order
to support this scenario, add a property 'pinctrl-use-default' to indicate
that the pin configuration is optional.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rob Herring 2018-07-09 09:41:49 -06:00 committed by Greg Kroah-Hartman
parent 25b4e70dcc
commit 7930eb919f
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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@ -103,6 +103,12 @@ Optional properties:
#pinctrl-cells: Number of pin control cells in addition to the index within the
pin controller device instance
pinctrl-use-default: Boolean. Indicates that the OS can use the boot default
pin configuration. This allows using an OS that does not have a
driver for the pin controller. This property can be set either
globally for the pin controller or in child nodes for individual
pin group control.
Pin controller devices should contain the pin configuration nodes that client
devices reference.