Joachim Eastwood | c61f819 | 2015-05-02 23:11:35 +0200 | [diff] [blame] | 1 | NXP LPC18xx/43xx GPIO controller Device Tree Bindings |
| 2 | ----------------------------------------------------- |
| 3 | |
| 4 | Required properties: |
| 5 | - compatible : Should be "nxp,lpc1850-gpio" |
| 6 | - reg : Address and length of the register set for the device |
| 7 | - clocks : Clock specifier (see clock bindings for details) |
| 8 | - gpio-controller : Marks the device node as a GPIO controller. |
| 9 | - #gpio-cells : Should be two |
| 10 | - First cell is the GPIO line number |
| 11 | - Second cell is used to specify polarity |
| 12 | |
| 13 | Optional properties: |
| 14 | - gpio-ranges : Mapping between GPIO and pinctrl |
| 15 | |
| 16 | Example: |
| 17 | #define LPC_GPIO(port, pin) (port * 32 + pin) |
| 18 | #define LPC_PIN(port, pin) (0x##port * 32 + pin) |
| 19 | |
| 20 | gpio: gpio@400f4000 { |
| 21 | compatible = "nxp,lpc1850-gpio"; |
| 22 | reg = <0x400f4000 0x4000>; |
| 23 | clocks = <&ccu1 CLK_CPU_GPIO>; |
| 24 | gpio-controller; |
| 25 | #gpio-cells = <2>; |
| 26 | gpio-ranges = <&pinctrl LPC_GPIO(0,0) LPC_PIN(0,0) 2>, |
| 27 | ... |
| 28 | <&pinctrl LPC_GPIO(7,19) LPC_PIN(f,5) 7>; |
| 29 | }; |
| 30 | |
| 31 | gpio_joystick { |
| 32 | compatible = "gpio-keys-polled"; |
| 33 | ... |
| 34 | |
| 35 | button@0 { |
| 36 | ... |
| 37 | gpios = <&gpio LPC_GPIO(4,8) GPIO_ACTIVE_LOW>; |
| 38 | }; |
| 39 | }; |