Documentation/devicetree/bindings/pinctrl/brcm,bcm4708-pinmux.txt

   1 Broadcom Northstar pins mux controller
   2
   3 Some of Northstar SoCs's pins can be used for various purposes thanks to the mux
   4 controller. This binding allows describing mux controller and listing available
   5 functions. They can be referenced later by other bindings to let system
   6 configure controller correctly.
   7
   8 A list of pins varies across chipsets so few bindings are available.
   9
  10 Node of the pinmux must be nested in the CRU (Central Resource Unit) "syscon"
  11 noce.
  12
  13 Required properties:
  14 - compatible: must be one of:
  15         "brcm,bcm4708-pinmux"
  16         "brcm,bcm4709-pinmux"
  17         "brcm,bcm53012-pinmux"
  18 - offset: offset of pin registers in the CRU block
  19
  20 Functions and their groups available for all chipsets:
  21 - "spi": "spi_grp"
  22 - "i2c": "i2c_grp"
  23 - "pwm": "pwm0_grp", "pwm1_grp", "pwm2_grp", "pwm3_grp"
  24 - "uart1": "uart1_grp"
  25
  26 Additionally available on BCM4709 and BCM53012:
  27 - "mdio": "mdio_grp"
  28 - "uart2": "uart2_grp"
  29 - "sdio": "sdio_pwr_grp", "sdio_1p8v_grp"
  30
  31 For documentation of subnodes see:
  32 Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
  33
  34 Example:
  35         dmu@1800c000 {
  36                 compatible = "simple-bus";
  37                 ranges = <0 0x1800c000 0x1000>;
  38                 #address-cells = <1>;
  39                 #size-cells = <1>;
  40
  41                 cru@100 {
  42                         compatible = "syscon", "simple-mfd";
  43                         reg = <0x100 0x1a4>;
  44
  45                         pinctrl {
  46                                 compatible = "brcm,bcm4708-pinmux";
  47                                 offset = <0xc0>;
  48
  49                                 spi-pins {
  50                                         function = "spi";
  51                                         groups = "spi_grp";
  52                                 };
  53                         };
  54                 };
  55         };