1 Keystone 2 DSP GPIO controller bindings 1 Keystone 2 DSP GPIO controller bindings
2 2
3 HOST OS userland running on ARM can send inter 3 HOST OS userland running on ARM can send interrupts to DSP cores using
4 the DSP GPIO controller IP. It provides 28 IRQ 4 the DSP GPIO controller IP. It provides 28 IRQ signals per each DSP core.
5 This is one of the component used by the IPC m 5 This is one of the component used by the IPC mechanism used on Keystone SOCs.
6 6
7 For example TCI6638K2K SoC has 8 DSP GPIO cont 7 For example TCI6638K2K SoC has 8 DSP GPIO controllers:
8 - 8 for C66x CorePacx CPUs 0-7 8 - 8 for C66x CorePacx CPUs 0-7
9 9
10 Keystone 2 DSP GPIO controller has specific fe 10 Keystone 2 DSP GPIO controller has specific features:
11 - each GPIO can be configured only as output p 11 - each GPIO can be configured only as output pin;
12 - setting GPIO value to 1 causes IRQ generatio 12 - setting GPIO value to 1 causes IRQ generation on target DSP core;
13 - reading pin value returns 0 - if IRQ was han 13 - reading pin value returns 0 - if IRQ was handled or 1 - IRQ is still
14 pending. 14 pending.
15 15
16 Required Properties: 16 Required Properties:
17 - compatible: should be "ti,keystone-dsp-gpio" 17 - compatible: should be "ti,keystone-dsp-gpio"
18 - ti,syscon-dev: phandle/offset pair. The phan 18 - ti,syscon-dev: phandle/offset pair. The phandle to syscon used to
19 access device state control registers and th 19 access device state control registers and the offset of device's specific
20 registers within device state control regist 20 registers within device state control registers range.
21 - gpio-controller: Marks the device node as a 21 - gpio-controller: Marks the device node as a gpio controller.
22 - #gpio-cells: Should be 2. 22 - #gpio-cells: Should be 2.
23 23
24 Please refer to gpio.txt in this directory for 24 Please refer to gpio.txt in this directory for details of the common GPIO
25 bindings used by client devices. 25 bindings used by client devices.
26 26
27 Example: 27 Example:
28 dspgpio0: keystone_dsp_gpio@2620240 { 28 dspgpio0: keystone_dsp_gpio@2620240 {
29 compatible = "ti,keystone-dsp- 29 compatible = "ti,keystone-dsp-gpio";
30 ti,syscon-dev = <&devctrl 0x24 30 ti,syscon-dev = <&devctrl 0x240>;
31 gpio-controller; 31 gpio-controller;
32 #gpio-cells = <2>; 32 #gpio-cells = <2>;
33 }; 33 };
34 34
35 dsp0: dsp0 { 35 dsp0: dsp0 {
36 compatible = "linux,rproc-user 36 compatible = "linux,rproc-user";
37 ... 37 ...
38 kick-gpio = <&dspgpio0 27>; 38 kick-gpio = <&dspgpio0 27>;
39 }; 39 };
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