| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | * Tegra keyboard controller |
| 2 | The key controller has maximum 24 pins to make matrix keypad. Any pin |
| 3 | can be configured as row or column. The maximum column pin can be 8 |
| 4 | and maximum row pins can be 16 for Tegra20/Tegra30. |
| 5 | |
| 6 | Required 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 | |
| 23 | Optional properties, in addition to those specified by the shared |
| 24 | matrix-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 | |
| 35 | Example: |
| 36 | |
| 37 | keyboard: 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 | }; |