summaryrefslogtreecommitdiffstats
path: root/kernel/Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt')
-rw-r--r--kernel/Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt39
1 files changed, 39 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt b/kernel/Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt
new file mode 100644
index 000000000..6c7e6c730
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt
@@ -0,0 +1,39 @@
+Keystone 2 DSP GPIO controller bindings
+
+HOST OS userland running on ARM can send interrupts to DSP cores using
+the DSP GPIO controller IP. It provides 28 IRQ signals per each DSP core.
+This is one of the component used by the IPC mechanism used on Keystone SOCs.
+
+For example TCI6638K2K SoC has 8 DSP GPIO controllers:
+ - 8 for C66x CorePacx CPUs 0-7
+
+Keystone 2 DSP GPIO controller has specific features:
+- each GPIO can be configured only as output pin;
+- setting GPIO value to 1 causes IRQ generation on target DSP core;
+- reading pin value returns 0 - if IRQ was handled or 1 - IRQ is still
+ pending.
+
+Required Properties:
+- compatible: should be "ti,keystone-dsp-gpio"
+- ti,syscon-dev: phandle/offset pair. The phandle to syscon used to
+ access device state control registers and the offset of device's specific
+ registers within device state control registers range.
+- gpio-controller: Marks the device node as a gpio controller.
+- #gpio-cells: Should be 2.
+
+Please refer to gpio.txt in this directory for details of the common GPIO
+bindings used by client devices.
+
+Example:
+ dspgpio0: keystone_dsp_gpio@02620240 {
+ compatible = "ti,keystone-dsp-gpio";
+ ti,syscon-dev = <&devctrl 0x240>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ dsp0: dsp0 {
+ compatible = "linux,rproc-user";
+ ...
+ kick-gpio = <&dspgpio0 27>;
+ };