Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 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 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 | }; |