1Keystone 2 DSP GPIO controller bindings 2 3HOST OS userland running on ARM can send interrupts to DSP cores using 4the DSP GPIO controller IP. It provides 28 IRQ signals per each DSP core. 5This is one of the component used by the IPC mechanism used on Keystone SOCs. 6 7For example TCI6638K2K SoC has 8 DSP GPIO controllers: 8 - 8 for C66x CorePacx CPUs 0-7 9 10Keystone 2 DSP GPIO controller has specific features: 11- each GPIO can be configured only as output pin; 12- setting GPIO value to 1 causes IRQ generation on target DSP core; 13- reading pin value returns 0 - if IRQ was handled or 1 - IRQ is still 14 pending. 15 16Required Properties: 17- compatible: should be "ti,keystone-dsp-gpio" 18- ti,syscon-dev: phandle/offset pair. The phandle to syscon used to 19 access device state control registers and the offset of device's specific 20 registers within device state control registers range. 21- gpio-controller: Marks the device node as a gpio controller. 22- #gpio-cells: Should be 2. 23 24Please refer to gpio.txt in this directory for details of the common GPIO 25bindings used by client devices. 26 27Example: 28 dspgpio0: keystone_dsp_gpio@2620240 { 29 compatible = "ti,keystone-dsp-gpio"; 30 ti,syscon-dev = <&devctrl 0x240>; 31 gpio-controller; 32 #gpio-cells = <2>; 33 }; 34 35 dsp0: dsp0 { 36 compatible = "linux,rproc-user"; 37 ... 38 kick-gpio = <&dspgpio0 27>; 39 }; 40