From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 650D0372EF9; Tue, 28 Apr 2026 09:14:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777367677; cv=none; b=EWHtDOcAxGQmKjD63oGT8pcCUwE180VUVLP70aXbwMa/ll0tpUd3Sgq5QwbSd+oBi3rhzrHyzsus11XVlp+cBMIVp5M2OdQQ9UK3/7uZYyiblu6LqOLbvOhFLaLT5lnUMmEvxgMQA70ePourxPeExSQDrEAGu5d+VMpA8Iocuf8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777367677; c=relaxed/simple; bh=sTgzxKlvNx3kDBwuHW7P1B6MFUo60aa2uqEAXCEDmo8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=usXHrYTBrds+ohBNqInFixxmucdjoq7rDTjS6hAHSNMTfWDd7cmnKMfR2rKwwFh/6qtk6RFyLHnaFS6MP2qVX0aT5zmIs7H+Ma+kLiZy9dCaBXoedZvXVdXU7m39xNiMNTKH8XrsKCS2lVJGq6EkbjDCEJXZcwJLbxqMujxRi3g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JYh0LZQR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JYh0LZQR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 93B6FC2BCAF; Tue, 28 Apr 2026 09:14:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777367677; bh=sTgzxKlvNx3kDBwuHW7P1B6MFUo60aa2uqEAXCEDmo8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=JYh0LZQR1Ey0PeC4fs+vIpv7mBdMhrYnzld5mG2EpEdfOrBQEARbZFdb6ul2QhDbr c/jZHYGg7uTlxdvtZqT5tZfjVPK4U9dI2zju6E9JQ6YtIj0Kf3vhSJfCKDi+glfO9E 1jpD4bMNmPBAFTTHtF8A3f4PRTip8t7B32Eathpt6bNUWlB8ut+QrtU5iGPYAV/qZe I+xvIdJJBQiz7EsM+BYzhlPSVi4dZ8gkEGnseVZciuiH/BuqrlJVvSLu0j/Ep59P9G OaFd7wnCD+9xouOBF/jXDMARGkA13eVRcjLlSd0RsbJR1MhwvbCphDxRwCM3vDClxY eMMMA7ZuD4rCg== Message-ID: <5ded8bbd-11b2-4552-80f5-972df15dc6e0@kernel.org> Date: Tue, 28 Apr 2026 11:14:32 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] dt-bindings: remoteproc: document AMD BRAM-based rproc To: Michal Simek , Ben Levinsky Cc: andersson@kernel.org, mathieu.poirier@linaro.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, tanmay.shah@amd.com References: <20260427162703.1644103-1-ben.levinsky@amd.com> <20260427162703.1644103-2-ben.levinsky@amd.com> <20260428-curly-hyena-of-triumph-fc1f4c@quoll> <68cf4479-c6f5-4947-bc75-df9be73644d3@amd.com> <998b67ff-192a-478f-a9c6-ddcd7773e27c@kernel.org> <86e464f2-974b-441d-9459-dd957c16993d@amd.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 28/04/2026 11:04, Michal Simek wrote: > > > On 4/28/26 10:47, Krzysztof Kozlowski wrote: >> On 28/04/2026 10:33, Michal Simek wrote: >>> >>> >>> On 4/28/26 08:50, Krzysztof Kozlowski wrote: >>>> On Mon, Apr 27, 2026 at 09:27:02AM -0700, Ben Levinsky wrote: >>>>> Describe an AMD BRAM-based soft-core processor subsystem instantiated in >>>>> programmable logic and using dual-port BRAM for firmware storage and >>>>> execution. >>>>> >>>>> The binding models a soft-core processor subsystem instantiated in AMD >>>>> programmable logic and using dual-port BRAM for firmware storage and >>>>> execution. 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" Best regards, Krzysztof