Hans de Goede | af6a5af | 2014-12-18 09:24:50 -0800 | [diff] [blame] | 1 | Allwinner sun4i low res adc attached tablet keys |
| 2 | ------------------------------------------------ |
| 3 | |
| 4 | Required properties: |
| 5 | - compatible: "allwinner,sun4i-a10-lradc-keys" |
| 6 | - reg: mmio address range of the chip |
| 7 | - interrupts: interrupt to which the chip is connected |
| 8 | - vref-supply: powersupply for the lradc reference voltage |
| 9 | |
| 10 | Each key is represented as a sub-node of "allwinner,sun4i-a10-lradc-keys": |
| 11 | |
| 12 | Required subnode-properties: |
| 13 | - label: Descriptive name of the key. |
| 14 | - linux,code: Keycode to emit. |
Karsten Merker | fd18ab8 | 2015-12-12 14:24:26 -0800 | [diff] [blame] | 15 | - channel: Channel this key is attached to, must be 0 or 1. |
Hans de Goede | af6a5af | 2014-12-18 09:24:50 -0800 | [diff] [blame] | 16 | - voltage: Voltage in µV at lradc input when this key is pressed. |
| 17 | |
| 18 | Example: |
| 19 | |
| 20 | #include <dt-bindings/input/input.h> |
| 21 | |
| 22 | lradc: lradc@01c22800 { |
| 23 | compatible = "allwinner,sun4i-a10-lradc-keys"; |
| 24 | reg = <0x01c22800 0x100>; |
| 25 | interrupts = <31>; |
| 26 | vref-supply = <®_vcc3v0>; |
| 27 | |
| 28 | button@191 { |
| 29 | label = "Volume Up"; |
| 30 | linux,code = <KEY_VOLUMEUP>; |
| 31 | channel = <0>; |
| 32 | voltage = <191274>; |
| 33 | }; |
| 34 | |
| 35 | button@392 { |
| 36 | label = "Volume Down"; |
| 37 | linux,code = <KEY_VOLUMEDOWN>; |
| 38 | channel = <0>; |
| 39 | voltage = <392644>; |
| 40 | }; |
| 41 | |
| 42 | button@601 { |
| 43 | label = "Menu"; |
| 44 | linux,code = <KEY_MENU>; |
| 45 | channel = <0>; |
| 46 | voltage = <601151>; |
| 47 | }; |
| 48 | |
| 49 | button@795 { |
| 50 | label = "Enter"; |
| 51 | linux,code = <KEY_ENTER>; |
| 52 | channel = <0>; |
| 53 | voltage = <795090>; |
| 54 | }; |
| 55 | |
| 56 | button@987 { |
| 57 | label = "Home"; |
| 58 | linux,code = <KEY_HOMEPAGE>; |
| 59 | channel = <0>; |
| 60 | voltage = <987387>; |
| 61 | }; |
| 62 | }; |