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Documentation / devicetree / bindings / mfd / cros-ec.txt




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Based on kernel version 3.13. Page generated on 2014-01-20 22:01 EST.

1	ChromeOS Embedded Controller
2	
3	Google's ChromeOS EC is a Cortex-M device which talks to the AP and
4	implements various function such as keyboard and battery charging.
5	
6	The EC can be connect through various means (I2C, SPI, LPC) and the
7	compatible string used depends on the interface. Each connection method has
8	its own driver which connects to the top level interface-agnostic EC driver.
9	Other Linux driver (such as cros-ec-keyb for the matrix keyboard) connect to
10	the top-level driver.
11	
12	Required properties (I2C):
13	- compatible: "google,cros-ec-i2c"
14	- reg: I2C slave address
15	
16	Required properties (SPI):
17	- compatible: "google,cros-ec-spi"
18	- reg: SPI chip select
19	
20	Required properties (LPC):
21	- compatible: "google,cros-ec-lpc"
22	- reg: List of (IO address, size) pairs defining the interface uses
23	
24	
25	Example for I2C:
26	
27	i2c@12CA0000 {
28		cros-ec@1e {
29			reg = <0x1e>;
30			compatible = "google,cros-ec-i2c";
31			interrupts = <14 0>;
32			interrupt-parent = <&wakeup_eint>;
33			wakeup-source;
34		};
35	
36	
37	Example for SPI:
38	
39	spi@131b0000 {
40		ec@0 {
41			compatible = "google,cros-ec-spi";
42			reg = <0x0>;
43			interrupts = <14 0>;
44			interrupt-parent = <&wakeup_eint>;
45			wakeup-source;
46			spi-max-frequency = <5000000>;
47			controller-data {
48			cs-gpio = <&gpf0 3 4 3 0>;
49			samsung,spi-cs;
50			samsung,spi-feedback-delay = <2>;
51			};
52		};
53	};
54	
55	
56	Example for LPC is not supplied as it is not yet implemented.
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