TI K3 DSP devices
=================
The TI K3 family of SoCs usually have one or more TI DSP Core sub-systems that
are used to offload some of the processor-intensive tasks or algorithms, for
achieving various system level goals.
These processor sub-systems usually contain additional sub-modules like L1
and/or L2 caches/SRAMs, an Interrupt Controller, an external memory controller,
a dedicated local power/sleep controller etc. The DSP processor cores in the
K3 SoCs is usually either a TMS320C66x CorePac processor or a TMS320C71x CorePac
processor.
DSP Device Node:
================
Each DSP Core sub-system is represented as a single DT node. Each node has a
number of required or optional properties that enable the OS running on the
host processor (Arm CorePac) to perform the device management of the remote
processor and to communicate with the remote processor.
Required properties:
--------------------
The following are the mandatory properties:
- compatible: Should be one of the following,
"ti,j721e-c66-dsp" for C66x DSPs on K3 J721E SoCs
"ti,j721e-c71-dsp" for C71x DSPs on K3 J721E SoCs
- reg: Should contain an entry for each value in 'reg-names'.
Each entry should have the memory region's start address
and the size of the region, the representation matching
the parent node's '#address-cells' and '#size-cells'
values.
- reg-names: Should contain strings with the following names, each
representing a specific internal memory region (if
present), and should be defined in this order,
"l2sram", "l1pram", "l1dram"
NOTE: C71x DSPs do not have a "l1pram" memory.
- ti,sci: Should be a phandle to the TI-SCI System Controller node
- ti,sci-dev-id: Should contain the TI-SCI device id corresponding to the
DSP Core. Please refer to the corresponding System
Controller documentation for valid values for the DSP
cores.
- ti,sci-proc-ids: Should contain 2 integer values. The first cell should
contain the TI-SCI processor id for the DSP core device
and the second cell should contain the TI-SCI host id to
which the processor control ownership should be
transferred to.
- resets: Should contain the phandle to the reset controller node
managing the resets for this device, and a reset
specifier. Please refer to the following reset bindings
for the reset argument specifier,
Documentation/devicetree/bindings/reset/ti,sci-reset.txt
Example:
---------
1. J721E SoC
/* J721E remoteproc alias */
aliases {
rproc6 = &c66_0;
rproc8 = &c71_0;
};
cbass_main: interconnect@100000 {
compatible = "simple-bus";
#address-cells = <2>;
#size-cells = <2>;
ranges = <0x00 0x64800000 0x00 0x64800000 0x00 0x00800000>,
/* C71_0 */
<0x4d 0x80800000 0x4d 0x80800000 0x00 0x00800000>,
/* C66_0 */
<0x4d 0x81800000 0x4d 0x81800000 0x00 0x00800000>;
/* C66_1 */
/* J721E C66_0 DSP node */
c66_0: dsp@4d80800000 {
compatible = "ti,j721e-c66-dsp";
reg = <0x4d 0x80800000 0x00 0x00048000>,
<0x4d 0x80e00000 0x00 0x00008000>,
<0x4d 0x80f00000 0x00 0x00008000>;
reg-names = "l2sram", "l1pram", "l1dram";
ti,sci = <&dmsc>;
ti,sci-dev-id = <142>;
ti,sci-proc-ids = <0x03 0xFF>;
resets = <&k3_reset 142 1>;
};
/* J721E C71_0 DSP node */
c71_0: dsp@64800000 {
compatible = "ti,j721e-c71-dsp";
reg = <0x00 0x64800000 0x00 0x00080000>,
<0x00 0x64e00000 0x00 0x0000c000>;
reg-names = "l2sram", "l1dram";
ti,sci = <&dmsc>;
ti,sci-dev-id = <15>;
ti,sci-proc-ids = <0x30 0xFF>;
resets = <&k3_reset 15 1>;
};
};