1*4882a593SmuzhiyunGeneric Parallel-in/Serial-out Shift Register GPIO Driver 2*4882a593Smuzhiyun 3*4882a593SmuzhiyunThis binding describes generic parallel-in/serial-out shift register 4*4882a593Smuzhiyundevices that can be used for GPI (General Purpose Input). This includes 5*4882a593SmuzhiyunSN74165 serial-out shift registers and the SN65HVS88x series of 6*4882a593Smuzhiyunindustrial serializers. 7*4882a593Smuzhiyun 8*4882a593SmuzhiyunRequired properties: 9*4882a593Smuzhiyun - compatible : Should be "pisosr-gpio". 10*4882a593Smuzhiyun - gpio-controller : Marks the device node as a GPIO controller. 11*4882a593Smuzhiyun - #gpio-cells : Should be two. For consumer use see gpio.txt. 12*4882a593Smuzhiyun 13*4882a593SmuzhiyunOptional properties: 14*4882a593Smuzhiyun - ngpios : Number of used GPIO lines (0..n-1), default is 8. 15*4882a593Smuzhiyun - load-gpios : GPIO pin specifier attached to load enable, this 16*4882a593Smuzhiyun pin is pulsed before reading from the device to 17*4882a593Smuzhiyun load input pin values into the the device. 18*4882a593Smuzhiyun 19*4882a593SmuzhiyunFor other required and optional properties of SPI slave 20*4882a593Smuzhiyunnodes please refer to ../spi/spi-bus.txt. 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunExample: 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun gpio@0 { 25*4882a593Smuzhiyun compatible = "ti,sn65hvs882", "pisosr-gpio"; 26*4882a593Smuzhiyun gpio-controller; 27*4882a593Smuzhiyun #gpio-cells = <2>; 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>; 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun reg = <0>; 32*4882a593Smuzhiyun spi-max-frequency = <1000000>; 33*4882a593Smuzhiyun spi-cpol; 34*4882a593Smuzhiyun }; 35