rmi_spi.txt (1643B)
1Synaptics RMI4 SPI Device Binding 2 3The Synaptics RMI4 core is able to support RMI4 devices using different 4transports and different functions. This file describes the device tree 5bindings for devices using the SPI transport driver. Complete documentation 6for other transports and functions can be found in 7Documentation/devicetree/bindings/input/rmi4. 8 9Required Properties: 10- compatible: syna,rmi4-spi 11- reg: Chip select address for the device 12- #address-cells: Set to 1 to indicate that the function child nodes 13 consist of only on uint32 value. 14- #size-cells: Set to 0 to indicate that the function child nodes do not 15 have a size property. 16 17Optional Properties: 18- interrupts: interrupt which the rmi device is connected to. 19See Documentation/devicetree/bindings/interrupt-controller/interrupts.txt 20 21- spi-rx-delay-us: microsecond delay after a read transfer. 22- spi-tx-delay-us: microsecond delay after a write transfer. 23 24Function Parameters: 25Parameters specific to RMI functions are contained in child nodes of the rmi device 26 node. Documentation for the parameters of each function can be found in: 27Documentation/devicetree/bindings/input/rmi4/rmi_f*.txt. 28 29 30 31Example: 32 spi@7000d800 { 33 rmi4-spi-dev@0 { 34 compatible = "syna,rmi4-spi"; 35 reg = <0x0>; 36 #address-cells = <1>; 37 #size-cells = <0>; 38 spi-max-frequency = <4000000>; 39 spi-cpha; 40 spi-cpol; 41 interrupt-parent = <&gpio>; 42 interrupts = <TEGRA_GPIO(K, 2) 0x2>; 43 spi-rx-delay-us = <30>; 44 45 rmi4-f01@1 { 46 reg = <0x1>; 47 syna,nosleep-mode = <1>; 48 }; 49 50 rmi4-f11@11 { 51 reg = <0x11>; 52 touchscreen-inverted-y; 53 syna,sensor-type = <2>; 54 }; 55 }; 56 };