1 GPIO controller on CE4100 / Sodaville SoCs 1 GPIO controller on CE4100 / Sodaville SoCs
2 ========================================== 2 ==========================================
3 3
4 The bindings for CE4100's GPIO controller matc 4 The bindings for CE4100's GPIO controller match the generic description
5 which is covered by the gpio.txt file in this 5 which is covered by the gpio.txt file in this folder.
6 6
7 The only additional property is the intel,muxc 7 The only additional property is the intel,muxctl property which holds the
8 value which is written into the MUXCNTL regist 8 value which is written into the MUXCNTL register.
9 9
10 There is no compatible property for now becaus 10 There is no compatible property for now because the driver is probed via
11 PCI id (vendor 0x8086 device 0x2e67). 11 PCI id (vendor 0x8086 device 0x2e67).
12 12
13 The interrupt specifier consists of two cells 13 The interrupt specifier consists of two cells encoded as follows:
14 - <1st cell>: The interrupt-number that ident 14 - <1st cell>: The interrupt-number that identifies the interrupt source.
15 - <2nd cell>: The level-sense information, en 15 - <2nd cell>: The level-sense information, encoded as follows:
16 4 - active high level-sensitiv 16 4 - active high level-sensitive
17 8 - active low level-sensitive 17 8 - active low level-sensitive
18 18
19 Example of the GPIO device and one user: 19 Example of the GPIO device and one user:
20 20
21 pcigpio: gpio@b,1 { 21 pcigpio: gpio@b,1 {
22 /* two cells for GPIO 22 /* two cells for GPIO and interrupt */
23 #gpio-cells = <2>; 23 #gpio-cells = <2>;
24 #interrupt-cells = <2> 24 #interrupt-cells = <2>;
25 compatible = "pci8086, 25 compatible = "pci8086,2e67.2",
26 "pc 26 "pci8086,2e67",
27 "pc 27 "pciclassff0000",
28 "pc 28 "pciclassff00";
29 29
30 reg = <0x15900 0x0 0x0 30 reg = <0x15900 0x0 0x0 0x0 0x0>;
31 /* Interrupt line of t 31 /* Interrupt line of the gpio device */
32 interrupts = <15 1>; 32 interrupts = <15 1>;
33 /* It is an interrupt 33 /* It is an interrupt and GPIO controller itself */
34 interrupt-controller; 34 interrupt-controller;
35 gpio-controller; 35 gpio-controller;
36 intel,muxctl = <0>; 36 intel,muxctl = <0>;
37 }; 37 };
38 38
39 testuser@20 { 39 testuser@20 {
40 compatible = "example, 40 compatible = "example,testuser";
41 /* User the 11th GPIO 41 /* User the 11th GPIO line as an active high triggered
42 * level interrupt 42 * level interrupt
43 */ 43 */
44 interrupts = <11 8>; 44 interrupts = <11 8>;
45 interrupt-parent = <&p 45 interrupt-parent = <&pcigpio>;
46 /* Use this GPIO also 46 /* Use this GPIO also with the gpio functions */
47 gpios = <&pcigpio 11 0 47 gpios = <&pcigpio 11 0>;
48 }; 48 };
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