145fe3fcaSAndrew F. DavisGeneric Parallel-in/Serial-out Shift Register GPIO Driver 245fe3fcaSAndrew F. Davis 345fe3fcaSAndrew F. DavisThis binding describes generic parallel-in/serial-out shift register 445fe3fcaSAndrew F. Davisdevices that can be used for GPI (General Purpose Input). This includes 545fe3fcaSAndrew F. DavisSN74165 serial-out shift registers and the SN65HVS88x series of 645fe3fcaSAndrew F. Davisindustrial serializers. 745fe3fcaSAndrew F. Davis 845fe3fcaSAndrew F. DavisRequired properties: 945fe3fcaSAndrew F. Davis - compatible : Should be "pisosr-gpio". 1045fe3fcaSAndrew F. Davis - gpio-controller : Marks the device node as a GPIO controller. 1145fe3fcaSAndrew F. Davis - #gpio-cells : Should be two. For consumer use see gpio.txt. 1245fe3fcaSAndrew F. Davis 1345fe3fcaSAndrew F. DavisOptional properties: 1445fe3fcaSAndrew F. Davis - ngpios : Number of used GPIO lines (0..n-1), default is 8. 1545fe3fcaSAndrew F. Davis - load-gpios : GPIO pin specifier attached to load enable, this 1645fe3fcaSAndrew F. Davis pin is pulsed before reading from the device to 1745fe3fcaSAndrew F. Davis load input pin values into the the device. 1845fe3fcaSAndrew F. Davis 1945fe3fcaSAndrew F. DavisFor other required and optional properties of SPI slave 2045fe3fcaSAndrew F. Davisnodes please refer to ../spi/spi-bus.txt. 2145fe3fcaSAndrew F. Davis 2245fe3fcaSAndrew F. DavisExample: 2345fe3fcaSAndrew F. Davis 2445fe3fcaSAndrew F. Davis gpio@0 { 2545fe3fcaSAndrew F. Davis compatible = "ti,sn65hvs882", "pisosr-gpio"; 2645fe3fcaSAndrew F. Davis gpio-controller; 2745fe3fcaSAndrew F. Davis #gpio-cells = <2>; 2845fe3fcaSAndrew F. Davis 2945fe3fcaSAndrew F. Davis load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>; 3045fe3fcaSAndrew F. Davis 3145fe3fcaSAndrew F. Davis reg = <0>; 3245fe3fcaSAndrew F. Davis spi-max-frequency = <1000000>; 3345fe3fcaSAndrew F. Davis spi-cpol; 3445fe3fcaSAndrew F. Davis }; 35