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| -rw-r--r-- | Documentation/devicetree/bindings/pinctrl/ste,nomadik.txt | 148 |
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diff --git a/Documentation/devicetree/bindings/pinctrl/ste,nomadik.txt b/Documentation/devicetree/bindings/pinctrl/ste,nomadik.txt new file mode 100644 index 000000000..221380243 --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/ste,nomadik.txt @@ -0,0 +1,148 @@ +ST Ericsson Nomadik pinmux controller + +Required properties: +- compatible: "stericsson,db8500-pinctrl", "stericsson,db8540-pinctrl", + "stericsson,stn8815-pinctrl" +- nomadik-gpio-chips: array of phandles to the corresponding GPIO chips + (these have the register ranges used by the pin controller). +- prcm: phandle to the PRCMU managing the back end of this pin controller + +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". + +ST Ericsson's pin configuration nodes act as a container for an arbitrary 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 pin(s)/group(s), and various pin configuration +parameters, such as input, output, pull up, pull down... + +The name of each subnode is not important; all subnodes should be enumerated +and processed purely based on their content. The subnodes use the generic +pin multiplexing node layout from the standard pin control bindings +(see pinctrl-bindings.txt): + +Required pin multiplexing subnode properties: +- function: A string containing the name of the function to mux to the + pin or group. +- groups : An array of strings. Each string contains the name of a pin + group that will be combined with the function to form a multiplexing + set-up. + +Required pin configuration subnode properties: +- pins: A string array describing the pins affected by the configuration + in the node. +- ste,config: Handle of pin configuration node + (e.g. ste,config = <&slpm_in_wkup_pdis>) + +- ste,input : <0/1/2> + 0: input with no pull + 1: input with pull up, + 2: input with pull down, + +- ste,output: <0/1/2> + 0: output low, + 1: output high, + 2: output (value is not specified). + +- ste,sleep: <0/1> + 0: sleep mode disable, + 1: sleep mode enable. + +- ste,sleep-input: <0/1/2/3> + 0: sleep input with no pull, + 1: sleep input with pull up, + 2: sleep input with pull down. + 3: sleep input and keep last input configuration (no pull, pull up or pull down). + +- ste,sleep-output: <0/1/2> + 0: sleep output low, + 1: sleep output high, + 2: sleep output (value is not specified). + +- ste,sleep-gpio: <0/1> + 0: disable sleep gpio mode, + 1: enable sleep gpio mode. + +- ste,sleep-wakeup: <0/1> + 0: wake-up detection enabled, + 1: wake-up detection disabled. + +- ste,sleep-pull-disable: <0/1> + 0: GPIO pull-up or pull-down resistor is enabled, when pin is an input, + 1: GPIO pull-up and pull-down resistor are disabled. + +Example board file extract: + + pinctrl@80157000 { + compatible = "stericsson,db8500-pinctrl"; + nomadik-gpio-chips = <&gpio0>, <&gpio1>, <&gpio2>, <&gpio3>; + prcm = <&prcmu>; + + pinctrl-names = "default"; + + slpm_in_wkup_pdis: slpm_in_wkup_pdis { + ste,sleep = <1>; + ste,sleep-input = <3>; + ste,sleep-wakeup = <1>; + ste,sleep-pull-disable = <0>; + }; + + slpm_out_hi_wkup_pdis: slpm_out_hi_wkup_pdis { + ste,sleep = <1>; + ste,sleep-output = <1>; + ste,sleep-wakeup = <1>; + ste,sleep-pull-disable = <0>; + }; + + slpm_out_wkup_pdis: slpm_out_wkup_pdis { + ste,sleep = <1>; + ste,sleep-output = <2>; + ste,sleep-wakeup = <1>; + ste,sleep-pull-disable = <0>; + }; + + uart0 { + uart0_default_mux: uart0_mux { + u0_default_mux { + function = "u0"; + pins = "u0_a_1"; + }; + }; + uart0_default_mode: uart0_default { + uart0_default_cfg1 { + pins = "GPIO0", "GPIO2"; + ste,input = <1>; + }; + + uart0_default_cfg2 { + pins = "GPIO1", "GPIO3"; + ste,output = <1>; + }; + }; + uart0_sleep_mode: uart0_sleep { + uart0_sleep_cfg1 { + pins = "GPIO0", "GPIO2"; + ste,config = <&slpm_in_wkup_pdis>; + }; + uart0_sleep_cfg2 { + pins = "GPIO1"; + ste,config = <&slpm_out_hi_wkup_pdis>; + }; + uart0_sleep_cfg3 { + pins = "GPIO3"; + ste,config = <&slpm_out_wkup_pdis>; + }; + }; + }; + }; + + uart@80120000 { + compatible = "arm,pl011", "arm,primecell"; + reg = <0x80120000 0x1000>; + interrupts = <0 11 0x4>; + + pinctrl-names = "default","sleep"; + pinctrl-0 = <&uart0_default_mux>, <&uart0_default_mode>; + pinctrl-1 = <&uart0_sleep_mode>; + }; |