mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-22 11:13:07 +00:00
39 lines
1 KiB
Text
39 lines
1 KiB
Text
|
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";
|
||
|
|
};
|
||
|
|
};
|