| Samsung Exynos4 GPIO Controller |
| - compatible: Compatible property value should be "samsung,exynos4-gpio>". |
| - reg: Physical base address of the controller and length of memory mapped |
| - #gpio-cells: Should be 4. The syntax of the gpio specifier used by client nodes |
| should be the following with values derived from the SoC user manual. |
| <[phandle of the gpio controller node] |
| [pin number within the gpio controller] |
| Values for gpio specifier: |
| - Pin number: is a value between 0 to 7. |
| - Flags and Pull Up/Down: 0 - Pull Up/Down Disabled. |
| Bit 16 (0x00010000) - Input is active low. |
| - Drive Strength: 0 - 1x, |
| - gpio-controller: Specifies that the node is a gpio controller. |
| - #address-cells: should be 1. |
| - #size-cells: should be 1. |
| gpa0: gpio-controller@11400000 { |
| compatible = "samsung,exynos4-gpio"; |