| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | Aspeed GPIO controller Device Tree Bindings |
| 2 | ------------------------------------------- |
| 3 | |
| 4 | Required properties: |
| 5 | - compatible : Either "aspeed,ast2400-gpio", "aspeed,ast2500-gpio", |
| 6 | or "aspeed,ast2600-gpio". |
| 7 | |
| 8 | - #gpio-cells : Should be two |
| 9 | - First cell is the GPIO line number |
| 10 | - Second cell is used to specify optional |
| 11 | parameters (unused) |
| 12 | |
| 13 | - reg : Address and length of the register set for the device |
| 14 | - gpio-controller : Marks the device node as a GPIO controller. |
| 15 | - interrupts : Interrupt specifier (see interrupt bindings for |
| 16 | details) |
| 17 | - interrupt-controller : Mark the GPIO controller as an interrupt-controller |
| 18 | |
| 19 | Optional properties: |
| 20 | |
| 21 | - clocks : A phandle to the clock to use for debounce timings |
| 22 | - ngpios : Number of GPIOs controlled by this controller. Should be set |
| 23 | when there are multiple GPIO controllers on a SoC (ast2600). |
| 24 | |
| 25 | The gpio and interrupt properties are further described in their respective |
| 26 | bindings documentation: |
| 27 | |
| 28 | - Documentation/devicetree/bindings/gpio/gpio.txt |
| 29 | - Documentation/devicetree/bindings/interrupt-controller/interrupts.txt |
| 30 | |
| 31 | Example: |
| 32 | gpio@1e780000 { |
| 33 | #gpio-cells = <2>; |
| 34 | compatible = "aspeed,ast2400-gpio"; |
| 35 | gpio-controller; |
| 36 | interrupts = <20>; |
| 37 | reg = <0x1e780000 0x1000>; |
| 38 | interrupt-controller; |
| 39 | }; |