From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 1F0733D25B2; Fri, 7 Aug 2026 07:52:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786089122; cv=none; b=giQO3ZV3l7YfPoM1anG6xcbdchTbzTHXnp6p/G2UxgfTVAxNDAUXnosE3PrkTc7ApbslWZ8LfkYqaHfjLBQAa8fecTZqYEv3b2gsT8FoaiQjv1iXM5/IVSQ3092QV0gBWx+FHV04NXrs6r3+bWBcK3xgX3R1Jyi8xqlql2sMfic= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786089122; c=relaxed/simple; bh=4qD5fY1GQJfzOAXquq7iHM3SPq0IIA9dKSgwR3iXJSs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dseWBSP6kjfnxz8dGYiVP/wEtITnGYpQIEOrw+G/UcdIUsKML/gLGzJUvlqEhUg1MmLiw6es9fDeT7vPD85ELu2eitBH/tSFV35TAU4SFq9eH6TIbRjwYduBzeEDcjorA8RJUuirvxxCcIsDUk5ez55ilFqERPVFf+wEB9XMH58= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iphmv/dt; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="iphmv/dt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 927871F000E9; Fri, 7 Aug 2026 07:51:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786089120; bh=ui/dJztSjklpZgdgdTpBoQ/4RYKD0Hs+Yl/44j6P7IM=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=iphmv/dtqzAEEkp2drdJnJNRmvsei4fRFyNo+qjT9hVWxZzpjf9cDBJ2X0lPWTyq3 Bg3BXuyiZ1ul4ufTneP8oZW/hA1HnqIK060ZQyyQ1t8OkSalxMFrLElP/XM8O5NtKp EWpVgfsdGcntOcc2lu7XiV/Zw/+akY797trWzpWcCMQQTbZHtQtrCheLPIEPBZ//Ey U0ddh9qGwunV49FZ9JM6XhW3y1dzO+vIJN4KzLdFKLrANZ55r6p/+edKThZOAfO8F3 iHOl27+qvI4QWXkLECZRcTwaatqFR7wvMcx75DcQwzRhtSCaxBSuhkJTrkEhaiCDnB 56E/NTYkQKGmA== Message-ID: Date: Fri, 7 Aug 2026 09:51:50 +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 3/6] dt-bindings: Add Bao I/O dispatcher driver binding To: =?UTF-8?Q?Jo=C3=A3o_Peixoto?= , joaopeixoto@osyx.tech, linux-kernel@vger.kernel.org Cc: ajd@linux.ibm.com, alex@ghiti.fr, aou@eecs.berkeley.edu, bagasdotme@gmail.com, catalin.marinas@arm.com, conor+dt@kernel.org, corbet@lwn.net, dan.j.williams@intel.com, davidmcerdeira@osyx.tech, devicetree@vger.kernel.org, dev@kael-k.io, gregkh@linuxfoundation.org, haren@linux.ibm.com, heiko@sntech.de, jose@osyx.tech, kever.yang@rock-chips.com, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, maddy@linux.ibm.com, mani@kernel.org, nathan@kernel.org, neil.armstrong@linaro.org, palmer@dabbelt.com, pjw@kernel.org, prabhakar.mahadev-lad.rj@bp.renesas.com, robh@kernel.org, will@kernel.org References: <20251224135217.25350-1-joaopeixoto@osyx.tech> <20260107162829.416885-1-joaopeixoto@osyx.tech> <20260107162829.416885-4-joaopeixoto@osyx.tech> <35100734-e2ea-459e-9b47-5cc62aa99b38@kernel.org> <20f4dad8-0ac5-4fc0-866a-38721371ba63@osyx.tech> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 07/08/2026 09:43, João Peixoto wrote: > > On 1/7/26 16:47, Krzysztof Kozlowski wrote: >> On 07/01/2026 17:28,joaopeixoto@osyx.tech wrote: >>> From: João Peixoto >>> >>> This patch introduces a device tree binding for the Bao I/O Dispatcher, >>> a device used in backend VMs running virtualized devices (e.g., VirtIO). >>> >>> Signed-off-by: João Peixoto >>> --- >>> .../bindings/bao/bao,io-dispatcher.yaml | 75 +++++++++++++++++++ >>> 1 file changed, 75 insertions(+) >>> create mode 100644 Documentation/devicetree/bindings/bao/bao,io-dispatcher.yaml >>> >>> diff --git a/Documentation/devicetree/bindings/bao/bao,io-dispatcher.yaml b/Documentation/devicetree/bindings/bao/bao,io-dispatcher.yaml >>> new file mode 100644 >>> index 000000000000..8ca450e4b9d5 >>> --- /dev/null >>> +++ b/Documentation/devicetree/bindings/bao/bao,io-dispatcher.yaml >>> @@ -0,0 +1,75 @@ >>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause >>> +%YAML 1.2 >>> +--- >>> +$id:http://devicetree.org/schemas/bao/bao,io-dispatcher.yaml# >>> +$schema:http://devicetree.org/meta-schemas/core.yaml# >>> + >>> +title: Bao I/O Dispatcher Device >> No, you don't get multiple devices per every driver. >> >> Look at gunyah or Mediatek Genio. Come back when you solve ENTIRE >> FEEDBACK given to them first. And then say how you solved that feedback >> because so far I see you only ignoring review of your LLM slop or other >> Microslop product. >> >> Best regards, >> Krzysztof > Thanks for the pointers, and sorry for the earlier churn. I looked at how > gunyah and the Mediatek Genio bindings model this and reworked the > dispatcher > the same way: there is no longer a single node describing N devices. Each > backend device is its own node with one reg region and one interrupt: > >   shmem@50000000 { >       compatible = "bao,io-dispatcher"; >       reg = <0x50000000 0x01000000>; >       interrupts = <0x0 0x08 0x1>; >       bao,id = <0>; >   }; > > A backend guest that services several frontends instantiates several such > nodes. reg and interrupts therefore have maxItems: 1. The driver was > rewritten to match (one platform device -> one device model -> one > /dev/bao-dmX) dropping the internal N-device array, the global DM list and > the indirection ioctl. > > I have also gone through the rest of the feedback on the series (the > ipcshmem > binding, the misc-device conversion, commit messages, changelog, threading) > and addressed each item; the cover letter enumerates them. The binding > passes > `make dt_binding_check`. Where is any upstream DTS using this? Why do we want another software nodes in DT? Best regards, Krzysztof