diff options
Diffstat (limited to 'Documentation/devicetree/bindings/pinctrl/pinctrl-atlas7.txt')
-rw-r--r-- | Documentation/devicetree/bindings/pinctrl/pinctrl-atlas7.txt | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-atlas7.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-atlas7.txt new file mode 100644 index 000000000..fbdd1a716 --- /dev/null +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-atlas7.txt @@ -0,0 +1,109 @@ +CSR SiRFatlas7 pinmux controller + +Required properties: +- compatible : "sirf,atlas7-ioc" +- reg : Address range of the pinctrl registers + +For example, pinctrl might have properties like the following: + pinctrl: ioc@18880000 { + compatible = "sirf,atlas7-ioc"; + reg = <0x18880000 0x1000>; + + a_ac97_pmx: ac97@0 { + ac97 { + groups = "audio_ac97_grp"; + function = "audio_ac97"; + }; + }; + + ... + + sd2_pmx: sd2@0 { + sd2 { + groups = "sd2_grp0"; + function = "sd2"; + }; + }; + + ... + + + sample0_cfg: sample0@0 { + sample0 { + pins = "ldd_0", "ldd_1"; + bias-pull-up; + }; + }; + + sample1_cfg: sample1@0 { + sample1 { + pins = "ldd_2", "ldd_3"; + input-schmitt-enable; + }; + }; + + sample2_cfg: sample2@0 { + sample2 { + groups = "uart4_nopause_grp"; + bias-pull-down; + }; + }; + + sample3_cfg: sample3@0 { + sample3 { + pins = "ldd_4", "ldd_5"; + drive-strength = <2>; + }; + }; + }; + +Please refer to pinctrl-bindings.txt in this directory for details of the common +pinctrl bindings used by client devices. + +SiRFatlas7's pinmux nodes act as a container for an arbitrary number of subnodes. +Each of these subnodes represents some desired configuration for a group of pins. + +Required subnode-properties: +- groups : An array of strings. Each string contains the name of a group. +- function: A string containing the name of the function to mux to the + group. + + Valid values for group and function names can be found from looking at the + group and function arrays in driver files: + drivers/pinctrl/pinctrl-sirf.c + +For example, pinctrl might have subnodes like the following: + sd0_pmx: sd0@0 { + sd0 { + groups = "sd0_grp"; + function = "sd0"; + }; + }; + + sd1_pmx0: sd1@0 { + sd1 { + groups = "sd1_grp0"; + function = "sd1_m0"; + }; + }; + + sd1_pmx1: sd1@1 { + sd1 { + groups = "sd1_grp1"; + function = "sd1_m1"; + }; + }; + +For a specific board, if it wants to use sd1, +it can add the following to its board-specific .dts file. +sd1: sd@12340000 { + pinctrl-names = "default"; + pinctrl-0 = <&sd1_pmx0>; +} + +or + +sd1: sd@12340000 { + pinctrl-names = "default"; + pinctrl-0 = <&sd1_pmx1>; +} |