1 Chrome OS CROS_EC Binding 2 ====================== 3 4 The device tree node which describes the operation of the CROS_EC interface 5 is as follows: 6 7 Required properties : 8 - compatible = "google,cros-ec" 9 10 Optional properties : 11 - spi-max-frequency : Sets the maximum frequency (in Hz) for SPI bus 12 operation 13 - i2c-max-frequency : Sets the maximum frequency (in Hz) for I2C bus 14 operation 15 - ec-interrupt : Selects the EC interrupt, defined as a GPIO according 16 to the platform 17 - optimise-flash-write : Boolean property - if present then flash blocks 18 containing all 0xff will not be written, since we assume that the EC 19 uses that pattern for erased blocks 20 21 The CROS_EC node should appear as a subnode of the interrupt that connects it 22 to the EC (e.g. i2c, spi, lpc). The reg property (as usual) will indicate 23 the unit address on that bus. 24 25 26 Example 27 ======= 28 29 spi@131b0000 { 30 cros-ec@0 { 31 reg = <0>; 32 compatible = "google,cros-ec"; 33 spi-max-frequency = <5000000>; 34 ec-interrupt = <&gpio 174 1>; 35 optimise-flash-write; 36 status = "disabled"; 37 }; 38 }; 39
