| UniPhier GPIO controller |
| |
| Required properties: |
| - compatible: Should be "socionext,uniphier-gpio". |
| - reg: Specifies offset and length of the register set for the device. |
| - gpio-controller: Marks the device node as a GPIO controller. |
| - #gpio-cells: Should be 2. The first cell is the pin number and the second |
| cell is used to specify optional parameters. |
| - interrupt-controller: Marks the device node as an interrupt controller. |
| - #interrupt-cells: Should be 2. The first cell defines the interrupt number. |
| The second cell bits[3:0] is used to specify trigger type as follows: |
| 1 = low-to-high edge triggered |
| 2 = high-to-low edge triggered |
| 4 = active high level-sensitive |
| 8 = active low level-sensitive |
| Valid combinations are 1, 2, 3, 4, 8. |
| - ngpios: Specifies the number of GPIO lines. |
| - gpio-ranges: Mapping to pin controller pins (as described in gpio.txt) |
| - socionext,interrupt-ranges: Specifies an interrupt number mapping between |
| this GPIO controller and its interrupt parent, in the form of arbitrary |
| number of <child-interrupt-base parent-interrupt-base length> triplets. |
| |
| Optional properties: |
| - gpio-ranges-group-names: Used for named gpio ranges (as described in gpio.txt) |
| |
| Example: |
| gpio: gpio@55000000 { |
| compatible = "socionext,uniphier-gpio"; |
| reg = <0x55000000 0x200>; |
| interrupt-parent = <&aidet>; |
| interrupt-controller; |
| #interrupt-cells = <2>; |
| gpio-controller; |
| #gpio-cells = <2>; |
| gpio-ranges = <&pinctrl 0 0 0>; |
| gpio-ranges-group-names = "gpio_range"; |
| ngpios = <248>; |
| socionext,interrupt-ranges = <0 48 16>, <16 154 5>, <21 217 3>; |
| }; |
| |
| Consumer Example: |
| |
| sdhci0_pwrseq { |
| compatible = "mmc-pwrseq-emmc"; |
| reset-gpios = <&gpio UNIPHIER_GPIO_PORT(29, 4) GPIO_ACTIVE_LOW>; |
| }; |
| |
| Please note UNIPHIER_GPIO_PORT(29, 4) represents PORT294 in the SoC document. |
| Unfortunately, only the one's place is octal in the port numbering. (That is, |
| PORT 8, 9, 18, 19, 28, 29, ... are missing.) UNIPHIER_GPIO_PORT() is a helper |
| macro to calculate 29 * 8 + 4. |
