Chrome OS CROS_EC Binding
======================
The device tree node which describes the operation of the CROS_EC interface
is as follows:
Required properties :
- compatible = "google,cros-ec"
Optional properties :
- spi-max-frequency : Sets the maximum frequency (in Hz) for SPI bus
operation
- i2c-max-frequency : Sets the maximum frequency (in Hz) for I2C bus
operation
- ec-interrupt : Selects the EC interrupt, defined as a GPIO according
to the platform
- optimise-flash-write : Boolean property - if present then flash blocks
containing all 0xff will not be written, since we assume that the EC
uses that pattern for erased blocks
The CROS_EC node should appear as a subnode of the interrupt that connects it
to the EC (e.g. i2c, spi, lpc). The reg property (as usual) will indicate
the unit address on that bus.
Example
=======
spi@131b0000 {
cros-ec@0 {
reg = <0>;
compatible = "google,cros-ec";
spi-max-frequency = <5000000>;
ec-interrupt = <&gpio 174 1>;
optimise-flash-write;
status = "disabled";
};
};