pinctrl: aspeed: Document pinconf in devicetree bindings
Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -34,13 +34,28 @@ Documentation/devicetree/bindings/mfd/syscon.txt
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Subnode Format
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==============
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The required properties of child nodes are (as defined in pinctrl-bindings):
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- function
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- groups
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The required properties of pinmux child nodes are:
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- function: the mux function to select
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- groups : the list of groups to select with this function
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Each function has only one associated pin group. Each group is named by its
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function. The following values for the function and groups properties are
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supported:
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Required properties of pinconf child nodes are:
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- groups: A list of groups to select (either this or "pins" must be
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specified)
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- pins : A list of ball names as strings, eg "D14" (either this or "groups"
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must be specified)
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Optional properties of pinconf child nodes are:
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- bias-disable : disable any pin bias
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- bias-pull-down: pull down the pin
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- drive-strength: sink or source at most X mA
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Definitions are as specified in
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Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt, with any
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further limitations as described above.
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For pinmux, each mux function has only one associated pin group. Each group is
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named by its function. The following values for the function and groups
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properties are supported:
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aspeed,ast2400-pinctrl, aspeed,g4-pinctrl:
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@ -90,6 +105,11 @@ syscon: scu@1e6e2000 {
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function = "I2C3";
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groups = "I2C3";
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};
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pinctrl_gpioh0_unbiased_default: gpioh0 {
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pins = "A8";
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bias-disable;
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};
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};
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};
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@ -110,6 +130,11 @@ ahb {
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function = "I2C3";
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groups = "I2C3";
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};
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pinctrl_gpioh0_unbiased_default: gpioh0 {
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pins = "A18";
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bias-disable;
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};
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};
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};
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@ -143,6 +168,3 @@ ahb {
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};
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};
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};
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Please refer to pinctrl-bindings.txt in this directory for details of the
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common pinctrl bindings used by client devices.
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