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1 | Generic Parallel-in/Serial-out Shift Register GPIO Driver |
2 | ||
3 | This binding describes generic parallel-in/serial-out shift register | |
4 | devices that can be used for GPI (General Purpose Input). This includes | |
5 | SN74165 serial-out shift registers and the SN65HVS88x series of | |
6 | industrial serializers. | |
7 | ||
8 | Required properties: | |
9 | - compatible : Should be "pisosr-gpio". | |
10 | - gpio-controller : Marks the device node as a GPIO controller. | |
11 | - #gpio-cells : Should be two. For consumer use see gpio.txt. | |
12 | ||
13 | Optional properties: | |
14 | - ngpios : Number of used GPIO lines (0..n-1), default is 8. | |
15 | - load-gpios : GPIO pin specifier attached to load enable, this | |
16 | pin is pulsed before reading from the device to | |
17 | load input pin values into the the device. | |
18 | ||
19 | For other required and optional properties of SPI slave | |
20 | nodes please refer to ../spi/spi-bus.txt. | |
21 | ||
22 | Example: | |
23 | ||
24 | gpio@0 { | |
25 | compatible = "ti,sn65hvs882", "pisosr-gpio"; | |
26 | gpio-controller; | |
27 | #gpio-cells = <2>; | |
28 | ||
29 | load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>; | |
30 | ||
31 | reg = <0>; | |
32 | spi-max-frequency = <1000000>; | |
33 | spi-cpol; | |
34 | }; |