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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: > > Yes, except what I wrote earlier and is mentioned in the writing > bindings doc - the specific compatible should be also the fallback. properties: compatible: oneOf: - const: xlnx,zynqmp-bram-rproc - items: - enum: - xlnx,versal-bram-rproc - xlnx,versal-net-bram-rproc - amd,versal2-bram-rproc - const: xlnx,zynqmp-bram-rproc Good now? M