1 * Generic 8-bits shift register GPIO driver
4 - compatible: Should contain one of the following:
7 - reg : chip select number
8 - gpio-controller : Marks the device node as a gpio controller.
9 - #gpio-cells : Should be two. The first cell is the pin number and
10 the second cell is used to specify the gpio polarity:
13 - registers-number: Number of daisy-chained shift registers
16 - enable-gpios: GPIO connected to the OE (Output Enable) pin.
21 compatible = "fairchild,74hc595";
25 registers-number = <4>;
26 spi-max-frequency = <100000>;