linux/Documentation/devicetree/bindings/input/nvidia,tegra20-kbc.txt
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   1* Tegra keyboard controller
   2The key controller has maximum 24 pins to make matrix keypad. Any pin
   3can be configured as row or column. The maximum column pin can be 8
   4and maximum row pins can be 16 for Tegra20/Tegra30.
   5
   6Required properties:
   7- compatible: "nvidia,tegra20-kbc"
   8- reg: Register base address of KBC.
   9- interrupts: Interrupt number for the KBC.
  10- nvidia,kbc-row-pins: The KBC pins which are configured as row. This is an
  11  array of pin numbers which is used as rows.
  12- nvidia,kbc-col-pins: The KBC pins which are configured as column. This is an
  13  array of pin numbers which is used as column.
  14- linux,keymap: The keymap for keys as described in the binding document
  15  devicetree/bindings/input/matrix-keymap.txt.
  16- clocks: Must contain one entry, for the module clock.
  17  See ../clocks/clock-bindings.txt for details.
  18- resets: Must contain an entry for each entry in reset-names.
  19  See ../reset/reset.txt for details.
  20- reset-names: Must include the following entries:
  21  - kbc
  22
  23Optional properties, in addition to those specified by the shared
  24matrix-keyboard bindings:
  25
  26- linux,fn-keymap: a second keymap, same specification as the
  27  matrix-keyboard-controller spec but to be used when the KEY_FN modifier
  28  key is pressed.
  29- nvidia,debounce-delay-ms: delay in milliseconds per row scan for debouncing
  30- nvidia,repeat-delay-ms: delay in milliseconds before repeat starts
  31- nvidia,ghost-filter: enable ghost filtering for this device
  32- wakeup-source: configure keyboard as a wakeup source for suspend/resume
  33                 (Legacy property supported: "nvidia,wakeup-source")
  34
  35Example:
  36
  37keyboard: keyboard {
  38        compatible = "nvidia,tegra20-kbc";
  39        reg = <0x7000e200 0x100>;
  40        interrupts = <0 85 0x04>;
  41        clocks = <&tegra_car 36>;
  42        resets = <&tegra_car 36>;
  43        reset-names = "kbc";
  44        nvidia,ghost-filter;
  45        nvidia,debounce-delay-ms = <640>;
  46        nvidia,kbc-row-pins = <0 1 2>;    /* pin 0, 1, 2 as rows */
  47        nvidia,kbc-col-pins = <11 12 13>; /* pin 11, 12, 13 as columns */
  48        linux,keymap = <0x00000074
  49                        0x00010067
  50                        0x00020066
  51                        0x01010068
  52                        0x02000069
  53                        0x02010070
  54                        0x02020071>;
  55};
  56