| * Generic 8-bits shift register GPIO driver |
| |
| Required properties: |
| - compatible: Should contain one of the following: |
| "fairchild,74hc595" |
| "nxp,74lvc594" |
| - reg : chip select number |
| - gpio-controller : Marks the device node as a gpio controller. |
| - #gpio-cells : Should be two. The first cell is the pin number and |
| the second cell is used to specify the gpio polarity: |
| 0 = active high |
| 1 = active low |
| - registers-number: Number of daisy-chained shift registers |
| |
| Optional properties: |
| - enable-gpios: GPIO connected to the OE (Output Enable) pin. |
| |
| Example: |
| |
| gpio5: gpio5@0 { |
| compatible = "fairchild,74hc595"; |
| reg = <0>; |
| gpio-controller; |
| #gpio-cells = <2>; |
| registers-number = <4>; |
| spi-max-frequency = <100000>; |
| }; |
