projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4052d45e SG |
1 | * Freescale MXS GPIO controller |
| 2 | ||
| 3 | The Freescale MXS GPIO controller is part of MXS PIN controller. The | |
| 4 | GPIOs are organized in port/bank. Each port consists of 32 GPIOs. | |
| 5 | ||
| 6 | As the GPIO controller is embedded in the PIN controller and all the | |
| 7 | GPIO ports share the same IO space with PIN controller, the GPIO node | |
| 8 | will be represented as sub-nodes of MXS pinctrl node. | |
| 9 | ||
| 10 | Required properties for GPIO node: | |
| 11 | - compatible : Should be "fsl,<soc>-gpio". The supported SoCs include | |
| 12 | imx23 and imx28. | |
| 13 | - interrupts : Should be the port interrupt shared by all 32 pins. | |
| 14 | - gpio-controller : Marks the device node as a gpio controller. | |
| 15 | - #gpio-cells : Should be two. The first cell is the pin number and | |
| c1cb4385 SG |
16 | the second cell is used to specify the gpio polarity: |
| 17 | 0 = active high | |
| 18 | 1 = active low | |
| 4052d45e SG |
19 | - interrupt-controller: Marks the device node as an interrupt controller. |
| 20 | - #interrupt-cells : Should be 2. The first cell is the GPIO number. | |
| 21 | The second cell bits[3:0] is used to specify trigger type and level flags: | |
| 22 | 1 = low-to-high edge triggered. | |
| 23 | 2 = high-to-low edge triggered. | |
| 24 | 4 = active high level-sensitive. | |
| 25 | 8 = active low level-sensitive. | |
| 26 | ||
| 27 | Note: Each GPIO port should have an alias correctly numbered in "aliases" | |
| 28 | node. | |
| 29 | ||
| 30 | Examples: | |
| 31 | ||
| 32 | aliases { | |
| 33 | gpio0 = &gpio0; | |
| 34 | gpio1 = &gpio1; | |
| 35 | gpio2 = &gpio2; | |
| 36 | gpio3 = &gpio3; | |
| 37 | gpio4 = &gpio4; | |
| 38 | }; | |
| 39 | ||
| 40 | pinctrl@80018000 { | |
| 41 | compatible = "fsl,imx28-pinctrl", "simple-bus"; | |
| 42 | reg = <0x80018000 2000>; | |
| 43 | ||
| 44 | gpio0: gpio@0 { | |
| 45 | compatible = "fsl,imx28-gpio"; | |
| 46 | interrupts = <127>; | |
| 47 | gpio-controller; | |
| 48 | #gpio-cells = <2>; | |
| 49 | interrupt-controller; | |
| 50 | #interrupt-cells = <2>; | |
| 51 | }; | |
| 52 | ||
| 53 | gpio1: gpio@1 { | |
| 54 | compatible = "fsl,imx28-gpio"; | |
| 55 | interrupts = <126>; | |
| 56 | gpio-controller; | |
| 57 | #gpio-cells = <2>; | |
| 58 | interrupt-controller; | |
| 59 | #interrupt-cells = <2>; | |
| 60 | }; | |
| 61 | ||
| 62 | gpio2: gpio@2 { | |
| 63 | compatible = "fsl,imx28-gpio"; | |
| 64 | interrupts = <125>; | |
| 65 | gpio-controller; | |
| 66 | #gpio-cells = <2>; | |
| 67 | interrupt-controller; | |
| 68 | #interrupt-cells = <2>; | |
| 69 | }; | |
| 70 | ||
| 71 | gpio3: gpio@3 { | |
| 72 | compatible = "fsl,imx28-gpio"; | |
| 73 | interrupts = <124>; | |
| 74 | gpio-controller; | |
| 75 | #gpio-cells = <2>; | |
| 76 | interrupt-controller; | |
| 77 | #interrupt-cells = <2>; | |
| 78 | }; | |
| 79 | ||
| 80 | gpio4: gpio@4 { | |
| 81 | compatible = "fsl,imx28-gpio"; | |
| 82 | interrupts = <123>; | |
| 83 | gpio-controller; | |
| 84 | #gpio-cells = <2>; | |
| 85 | interrupt-controller; | |
| 86 | #interrupt-cells = <2>; | |
| 87 | }; | |
| 88 | }; |