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John Crispin
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trunk/Documentation/devicetree/bindings/pinctrl/lantiq,xway-pinumx.txt
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Lantiq XWAY pinmux controller | ||
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Required properties: | ||
- compatible: "lantiq,pinctrl-xway" or "lantiq,pinctrl-xr9" | ||
- reg: Should contain the physical address and length of the gpio/pinmux | ||
register range | ||
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Please refer to pinctrl-bindings.txt in this directory for details of the | ||
common pinctrl bindings used by client devices, including the meaning of the | ||
phrase "pin configuration node". | ||
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Lantiq's pin configuration nodes act as a container for an abitrary number of | ||
subnodes. Each of these subnodes represents some desired configuration for a | ||
pin, a group, or a list of pins or groups. This configuration can include the | ||
mux function to select on those group(s), and two pin configuration parameters: | ||
pull-up and open-drain | ||
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The name of each subnode is not important as long as it is unique; all subnodes | ||
should be enumerated and processed purely based on their content. | ||
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Each subnode only affects those parameters that are explicitly listed. In | ||
other words, a subnode that lists a mux function but no pin configuration | ||
parameters implies no information about any pin configuration parameters. | ||
Similarly, a pin subnode that describes a pullup parameter implies no | ||
information about e.g. the mux function. | ||
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We support 2 types of nodes. | ||
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Definition of mux function groups: | ||
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Required subnode-properties: | ||
- lantiq,groups : An array of strings. Each string contains the name of a group. | ||
Valid values for these names are listed below. | ||
- lantiq,function: A string containing the name of the function to mux to the | ||
group. Valid values for function names are listed below. | ||
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Valid values for group and function names: | ||
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mux groups: | ||
exin0, exin1, exin2, jtag, ebu a23, ebu a24, ebu a25, ebu clk, ebu cs1, | ||
ebu wait, nand ale, nand cs1, nand cle, spi, spi_cs1, spi_cs2, spi_cs3, | ||
spi_cs4, spi_cs5, spi_cs6, asc0, asc0 cts rts, stp, nmi , gpt1, gpt2, | ||
gpt3, clkout0, clkout1, clkout2, clkout3, gnt1, gnt2, gnt3, req1, req2, | ||
req3 | ||
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additional mux groups (XR9 only): | ||
mdio, nand rdy, nand rd, exin3, exin4, gnt4, req4 | ||
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functions: | ||
spi, asc, cgu, jtag, exin, stp, gpt, nmi, pci, ebu, mdio | ||
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Definition of pin configurations: | ||
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Required subnode-properties: | ||
- lantiq,pins : An array of strings. Each string contains the name of a pin. | ||
Valid values for these names are listed below. | ||
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Optional subnode-properties: | ||
- lantiq,pull: Integer, representing the pull-down/up to apply to the pin. | ||
0: none, 1: down, 2: up. | ||
- lantiq,open-drain: Boolean, enables open-drain on the defined pin. | ||
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Valid values for XWAY pin names: | ||
Pinconf pins can be referenced via the names io0-io31. | ||
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Valid values for XR9 pin names: | ||
Pinconf pins can be referenced via the names io0-io55. | ||
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Example: | ||
gpio: pinmux@E100B10 { | ||
compatible = "lantiq,pinctrl-xway"; | ||
pinctrl-names = "default"; | ||
pinctrl-0 = <&state_default>; | ||
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#gpio-cells = <2>; | ||
gpio-controller; | ||
reg = <0xE100B10 0xA0>; | ||
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state_default: pinmux { | ||
stp { | ||
lantiq,groups = "stp"; | ||
lantiq,function = "stp"; | ||
}; | ||
pci { | ||
lantiq,groups = "gnt1"; | ||
lantiq,function = "pci"; | ||
}; | ||
conf_out { | ||
lantiq,pins = "io4", "io5", "io6"; /* stp */ | ||
lantiq,open-drain; | ||
lantiq,pull = <0>; | ||
}; | ||
}; | ||
}; | ||
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