| Simon Glass | 31cc5b4 | 2020-09-22 12:45:01 -0600 | [diff] [blame] | 1 | I2C generic device |
| 2 | ================== |
| 3 | |
| 4 | This is used only to generate ACPI tables for an I2C device. |
| 5 | |
| 6 | Required properties : |
| 7 | |
| 8 | - compatible : "i2c-chip"; |
| 9 | - reg : I2C chip address |
| 10 | - acpi,hid : HID name for the device |
| 11 | |
| 12 | Optional properies in addition to device.txt: |
| 13 | |
| 14 | - reset-gpios : GPIO used to assert reset to the device |
| 15 | - irq-gpios : GPIO used for interrupt (if Interrupt is not used) |
| 16 | - stop-gpios : GPIO used to stop the device |
| 17 | - interrupts-extended : Interrupt to use for the device |
| 18 | - reset-delay-ms : Delay after de-asserting reset, in ms |
| 19 | - reset-off-delay-ms : Delay after asserting reset (during power off) |
| 20 | - enable-delay-ms : Delay after asserting enable |
| 21 | - enable-off-delay-ms : Delay after de-asserting enable (during power off) |
| 22 | - stop-delay-ms : Delay after de-aserting stop |
| 23 | - stop-off-delay-ms : Delay after asserting stop (during power off) |
| 24 | - hid-descr-addr : HID register offset (for Human Interface Devices) |
| 25 | |
| 26 | Example |
| 27 | ------- |
| 28 | |
| 29 | elan-touchscreen@10 { |
| 30 | compatible = "i2c-chip"; |
| 31 | reg = <0x10>; |
| 32 | acpi,hid = "ELAN0001"; |
| 33 | acpi,ddn = "ELAN Touchscreen"; |
| 34 | interrupts-extended = <&acpi_gpe GPIO_21_IRQ |
| 35 | IRQ_TYPE_EDGE_FALLING>; |
| 36 | linux,probed; |
| 37 | reset-gpios = <&gpio_n GPIO_36 GPIO_ACTIVE_HIGH>; |
| 38 | reset-delay-ms = <20>; |
| 39 | enable-gpios = <&gpio_n GPIO_152 GPIO_ACTIVE_HIGH>; |
| 40 | enable-delay-ms = <1>; |
| 41 | acpi,has-power-resource; |
| 42 | }; |