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The remoteproc device is represented as a child node whose >>>>>> reg property describes the firmware memory window in the processor-local >>>>>> address space. The parent bus node provides standard devicetree address >>>>>> translation through ranges so Linux can access the same BRAM through the >>>>>> system physical address space. >>>>>> >>>>>> A clock input feeds the soft-core processor subsystem, and an active-low >>>>>> reset GPIO holds the processor in reset until firmware loading >>>>>> completes. The firmware-name property is optional. >>>>>> >>>>>> Signed-off-by: Ben Levinsky >>>>>> --- >>>>>> .../bindings/remoteproc/amd,bram-rproc.yaml | 98 +++++++++++++++++++ >>>>>> 1 file changed, 98 insertions(+) >>>>>> create mode 100644 Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml >>>>>> >>>>>> diff --git a/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml >>>>>> new file mode 100644 >>>>>> index 000000000000..f16657dc0d9f >>>>>> --- /dev/null >>>>>> +++ b/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml >>>>>> @@ -0,0 +1,98 @@ >>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >>>>>> +%YAML 1.2 >>>>>> +--- >>>>>> +$id: http://devicetree.org/schemas/remoteproc/amd,bram-rproc.yaml# >>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml# >>>>>> + >>>>>> +title: AMD BRAM-based Remote Processor >>>>>> + >>>>>> +maintainers: >>>>>> + - Ben Levinsky >>>>>> + >>>>>> +description: | >>>>>> + Soft-core processor subsystem instantiated in AMD programmable logic and >>>>>> + using dual-port BRAM for firmware storage and execution. >>>>> >>>>> Isn't the soft-core or FPGA still part of some Xilinx SoC? Or is this >>>>> completely different thing from SoC and there is a design WITHOUT SoC >>>>> using this remote proc? >>>> >>>> In 99% case this is going to be used on Xilinx SOC with programmable logic next >>>> to ARM core. >>>> soft core means - means VHDL/Verilog code synthesized to programmable >>>> logic/fpga. It means exact location in chip varies based on build and constraints. >>>> >>>> hard core - physical HW location - like ARM cores in our chip. >>>> >>>> (ARM is providing RTL/code that even ARM cores in fpga emulated platforms are >>>> actually used as soft cores). >>>> >>>> Not sure if you want me to talk about that 1% use cases which are also possible >>>> but don't think anybody will design them. >>> >>> Then I would treat it exactly like every other block of a SoC - you need >>> a SoC specific compatible. If there is a fallback, SoC specific >>> compatible should be used in the fallback as well - that's all already >>> documented in writing-bindings. >> >> But which SOC? We have ZynqMP, Versal, Versal NET, Versal Gen 2. And all of >> these will use this configuration. >> Do you want to list all of them? > > "Then I would treat it exactly like every other block of a SoC" No issue. Here is snippet. properties: compatible: items: - enum: - xlnx,zynqmp-bram-rproc - xlnx,versal-bram-rproc - xlnx,versal-net-bram-rproc - amd,versal2-bram-rproc - const: amd,bram-rproc The example should also be updated: examples: - | #include remoteproc@0 { compatible = "xlnx,zynqmp-bram-rproc", "amd,bram-rproc"; reg = <0x0 0x40000>; clocks = <&pl_clk>; firmware-name = "firmware.elf"; reset-gpios = <&gpio0 0 GPIO_ACTIVE_LOW>; }; Thanks, Michal