| Shawn Guo | 4052d45 | 2012-05-04 14:29:22 +0800 | [diff] [blame] | 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 |
| 16 | the second cell is used to specify optional parameters (currently |
| 17 | unused). |
| 18 | - interrupt-controller: Marks the device node as an interrupt controller. |
| 19 | - #interrupt-cells : Should be 2. The first cell is the GPIO number. |
| 20 | The second cell bits[3:0] is used to specify trigger type and level flags: |
| 21 | 1 = low-to-high edge triggered. |
| 22 | 2 = high-to-low edge triggered. |
| 23 | 4 = active high level-sensitive. |
| 24 | 8 = active low level-sensitive. |
| 25 | |
| 26 | Note: Each GPIO port should have an alias correctly numbered in "aliases" |
| 27 | node. |
| 28 | |
| 29 | Examples: |
| 30 | |
| 31 | aliases { |
| 32 | gpio0 = &gpio0; |
| 33 | gpio1 = &gpio1; |
| 34 | gpio2 = &gpio2; |
| 35 | gpio3 = &gpio3; |
| 36 | gpio4 = &gpio4; |
| 37 | }; |
| 38 | |
| 39 | pinctrl@80018000 { |
| 40 | compatible = "fsl,imx28-pinctrl", "simple-bus"; |
| 41 | reg = <0x80018000 2000>; |
| 42 | |
| 43 | gpio0: gpio@0 { |
| 44 | compatible = "fsl,imx28-gpio"; |
| 45 | interrupts = <127>; |
| 46 | gpio-controller; |
| 47 | #gpio-cells = <2>; |
| 48 | interrupt-controller; |
| 49 | #interrupt-cells = <2>; |
| 50 | }; |
| 51 | |
| 52 | gpio1: gpio@1 { |
| 53 | compatible = "fsl,imx28-gpio"; |
| 54 | interrupts = <126>; |
| 55 | gpio-controller; |
| 56 | #gpio-cells = <2>; |
| 57 | interrupt-controller; |
| 58 | #interrupt-cells = <2>; |
| 59 | }; |
| 60 | |
| 61 | gpio2: gpio@2 { |
| 62 | compatible = "fsl,imx28-gpio"; |
| 63 | interrupts = <125>; |
| 64 | gpio-controller; |
| 65 | #gpio-cells = <2>; |
| 66 | interrupt-controller; |
| 67 | #interrupt-cells = <2>; |
| 68 | }; |
| 69 | |
| 70 | gpio3: gpio@3 { |
| 71 | compatible = "fsl,imx28-gpio"; |
| 72 | interrupts = <124>; |
| 73 | gpio-controller; |
| 74 | #gpio-cells = <2>; |
| 75 | interrupt-controller; |
| 76 | #interrupt-cells = <2>; |
| 77 | }; |
| 78 | |
| 79 | gpio4: gpio@4 { |
| 80 | compatible = "fsl,imx28-gpio"; |
| 81 | interrupts = <123>; |
| 82 | gpio-controller; |
| 83 | #gpio-cells = <2>; |
| 84 | interrupt-controller; |
| 85 | #interrupt-cells = <2>; |
| 86 | }; |
| 87 | }; |