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author | John Crispin <blogic@openwrt.org> | 2012-07-22 09:23:50 +0200 |
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committer | John Crispin <blogic@openwrt.org> | 2012-09-13 10:30:59 +0200 |
commit | 8e004b47b7645fe8ebe1bb81f75cd8f16650de68 (patch) | |
tree | 6d4151cb6ec0edeeced5b0a669363644bf925706 /Documentation | |
parent | 5c56f76995691cf761f66d6d89a00eea80be660c (diff) | |
download | op-kernel-dev-8e004b47b7645fe8ebe1bb81f75cd8f16650de68.zip op-kernel-dev-8e004b47b7645fe8ebe1bb81f75cd8f16650de68.tar.gz |
Document: devicetree: add OF documents for lantiq falcon pinctrl
Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/pinctrl/lantiq,falcon-pinumx.txt | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/lantiq,falcon-pinumx.txt b/Documentation/devicetree/bindings/pinctrl/lantiq,falcon-pinumx.txt new file mode 100644 index 0000000..daa7689 --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/lantiq,falcon-pinumx.txt @@ -0,0 +1,83 @@ +Lantiq FALCON pinmux controller + +Required properties: +- compatible: "lantiq,pinctrl-falcon" +- reg: Should contain the physical address and length of the gpio/pinmux + register range + +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". + +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 + +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. + +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. + +We support 2 types of nodes. + +Definition of mux function groups: + +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. + +Valid values for group and function names: + + mux groups: + por, ntr, ntr8k, hrst, mdio, bootled, asc0, spi, spi cs0, spi cs1, i2c, + jtag, slic, pcm, asc1 + + functions: + rst, ntr, mdio, led, asc, spi, i2c, jtag, slic, pcm + + +Definition of pin configurations: + +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. + +Optional subnode-properties: +- lantiq,pull: Integer, representing the pull-down/up to apply to the pin. + 0: none, 1: down +- lantiq,drive-current: Boolean, enables drive-current +- lantiq,slew-rate: Boolean, enables slew-rate + +Example: + pinmux0 { + compatible = "lantiq,pinctrl-falcon"; + pinctrl-names = "default"; + pinctrl-0 = <&state_default>; + + state_default: pinmux { + asc0 { + lantiq,groups = "asc0"; + lantiq,function = "asc"; + }; + ntr { + lantiq,groups = "ntr8k"; + lantiq,function = "ntr"; + }; + i2c { + lantiq,groups = "i2c"; + lantiq,function = "i2c"; + }; + hrst { + lantiq,groups = "hrst"; + lantiq,function = "rst"; + }; + }; + }; |