I2C generic device
==================
This is used only to generate ACPI tables for an I2C device.
Required properties :
- compatible : "i2c-chip";
- reg : I2C chip address
- acpi,hid : HID name for the device
Optional properies in addition to device.txt:
- reset-gpios : GPIO used to assert reset to the device
- irq-gpios : GPIO used for interrupt (if Interrupt is not used)
- stop-gpios : GPIO used to stop the device
- interrupts-extended : Interrupt to use for the device
- reset-delay-ms : Delay after de-asserting reset, in ms
- reset-off-delay-ms : Delay after asserting reset (during power off)
- enable-delay-ms : Delay after asserting enable
- enable-off-delay-ms : Delay after de-asserting enable (during power off)
- stop-delay-ms : Delay after de-aserting stop
- stop-off-delay-ms : Delay after asserting stop (during power off)
- hid-descr-addr : HID register offset (for Human Interface Devices)
Example
-------
elan-touchscreen@10 {
compatible = "i2c-chip";
reg = <0x10>;
acpi,hid = "ELAN0001";
acpi,ddn = "ELAN Touchscreen";
interrupts-extended = <&acpi_gpe GPIO_21_IRQ
IRQ_TYPE_EDGE_FALLING>;
linux,probed;
reset-gpios = <&gpio_n GPIO_36 GPIO_ACTIVE_HIGH>;
reset-delay-ms = <20>;
enable-gpios = <&gpio_n GPIO_152 GPIO_ACTIVE_HIGH>;
enable-delay-ms = <1>;
acpi,has-power-resource;
};