110 lines
2.1 KiB
Plaintext
110 lines
2.1 KiB
Plaintext
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CSR SiRFatlas7 pinmux controller
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Required properties:
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- compatible : "sirf,atlas7-ioc"
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- reg : Address range of the pinctrl registers
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For example, pinctrl might have properties like the following:
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pinctrl: ioc@18880000 {
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compatible = "sirf,atlas7-ioc";
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reg = <0x18880000 0x1000>;
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a_ac97_pmx: ac97@0 {
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ac97 {
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groups = "audio_ac97_grp";
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function = "audio_ac97";
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};
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};
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...
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sd2_pmx: sd2@0 {
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sd2 {
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groups = "sd2_grp0";
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function = "sd2";
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};
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};
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...
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sample0_cfg: sample0@0 {
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sample0 {
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pins = "ldd_0", "ldd_1";
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bias-pull-up;
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};
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};
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sample1_cfg: sample1@0 {
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sample1 {
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pins = "ldd_2", "ldd_3";
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input-schmitt-enable;
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};
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};
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sample2_cfg: sample2@0 {
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sample2 {
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groups = "uart4_nopause_grp";
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bias-pull-down;
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};
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};
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sample3_cfg: sample3@0 {
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sample3 {
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pins = "ldd_4", "ldd_5";
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drive-strength = <2>;
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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 common
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pinctrl bindings used by client devices.
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SiRFatlas7's pinmux nodes act as a container for an abitrary number of subnodes.
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Each of these subnodes represents some desired configuration for a group of pins.
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Required subnode-properties:
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- groups : An array of strings. Each string contains the name of a group.
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- function: A string containing the name of the function to mux to the
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group.
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Valid values for group and function names can be found from looking at the
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group and function arrays in driver files:
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drivers/pinctrl/pinctrl-sirf.c
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For example, pinctrl might have subnodes like the following:
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sd0_pmx: sd0@0 {
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sd0 {
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groups = "sd0_grp";
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function = "sd0";
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};
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};
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sd1_pmx0: sd1@0 {
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sd1 {
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groups = "sd1_grp0";
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function = "sd1_m0";
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};
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};
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sd1_pmx1: sd1@1 {
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sd1 {
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groups = "sd1_grp1";
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function = "sd1_m1";
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};
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};
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For a specific board, if it wants to use sd1,
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it can add the following to its board-specific .dts file.
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sd1: sd@12340000 {
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pinctrl-names = "default";
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pinctrl-0 = <&sd1_pmx0>;
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}
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or
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sd1: sd@12340000 {
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pinctrl-names = "default";
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pinctrl-0 = <&sd1_pmx1>;
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}
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