Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Document: devicetree: add OF documents for lantiq falcon pinctrl

Browse source 
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
This commit is contained in:
John Crispin 2012-07-22 09:23:50 +02:00
parent 5c56f76995
commit 8e004b47b7
1 changed files with 83 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

83
Documentation/devicetree/bindings/pinctrl/lantiq,falcon-pinumx.txt Normal file
View file

@ -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";
};
};
};