Documentation/devicetree/bindings/input/rmi4/rmi_spi.txt

   1 Synaptics RMI4 SPI Device Binding
   2
   3 The Synaptics RMI4 core is able to support RMI4 devices using different
   4 transports and different functions. This file describes the device tree
   5 bindings for devices using the SPI transport driver. Complete documentation
   6 for other transports and functions can be found in
   7 Documentation/devicetree/bindings/input/rmi4.
   8
   9 Required Properties:
  10 - compatible: syna,rmi4-spi
  11 - reg: Chip select address for the device
  12 - #address-cells: Set to 1 to indicate that the function child nodes
  13                     consist of only on uint32 value.
  14 - #size-cells: Set to 0 to indicate that the function child nodes do not
  15                 have a size property.
  16
  17 Optional Properties:
  18 - interrupts: interrupt which the rmi device is connected to.
  19 - interrupt-parent: The interrupt controller.
  20 See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
  21
  22 - spi-rx-delay-us: microsecond delay after a read transfer.
  23 - spi-tx-delay-us: microsecond delay after a write transfer.
  24
  25 Function Parameters:
  26 Parameters specific to RMI functions are contained in child nodes of the rmi device
  27  node. Documentation for the parameters of each function can be found in:
  28 Documentation/devicetree/bindings/input/rmi4/rmi_f*.txt.
  29
  30
  31
  32 Example:
  33         spi@7000d800 {
  34                 rmi4-spi-dev@0 {
  35                         compatible = "syna,rmi4-spi";
  36                         reg = <0x0>;
  37                         #address-cells = <1>;
  38                         #size-cells = <0>;
  39                         spi-max-frequency = <4000000>;
  40                         spi-cpha;
  41                         spi-cpol;
  42                         interrupt-parent = <&gpio>;
  43                         interrupts = <TEGRA_GPIO(K, 2) 0x2>;
  44                         spi-rx-delay-us = <30>;
  45
  46                         rmi4-f01@1 {
  47                                 reg = <0x1>;
  48                                 syna,nosleep-mode = <1>;
  49                         };
  50
  51                         rmi4-f11@11 {
  52                                 reg = <0x11>;
  53                                 touchscreen-inverted-y;
  54                                 syna,sensor-type = <2>;
  55                         };
  56                 };
  57         };