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 8F64B3054D8; Wed, 28 Jan 2026 15:52:57 +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=1769615577; cv=none; b=E2yDlTNsZiuSOtJC7VmIGWB3W6o8yz8VZKKrSvVBpP7zl7y0QaLGT1bFNJbYcQSrtry8ZtobD3b1hqQ3Wnz+1q9uJArX4UIcJhfgfRbmx04L0SOgoaBE8SAVAZo0ISkyEreZwQMGj9HiJGfBY5cHBRVI2tTQ8ZJOGbXpTFaAeAM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769615577; c=relaxed/simple; bh=gYtK69Ijw5vV9EMQCc9rRmfhGQ2ACLcs0r10LswPOM8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Js+eFyhau8dhZjr8wp9cO79RiZLE4+LVzoypUiTOL5x4OavxmF+XM3k765I3jQeWgVk5wYKeB4NOuCHsdeO6g4oWcmgZ4iuODMYypLRONWV3A46Bfi79nfGrVpQDLnYwC14Prc/z3n78iy89EFaBhPQ39rT2xNCUJnnnWoGtfR8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=s1FUbQ1b; 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="s1FUbQ1b" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4910EC4CEF1; Wed, 28 Jan 2026 15:52:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769615577; bh=gYtK69Ijw5vV9EMQCc9rRmfhGQ2ACLcs0r10LswPOM8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=s1FUbQ1bodiE8Of23jnDEvJiZt+AruZfrmMuHWHH0zSrB77yCv0GkCEQZd4s9Q9Vp i5Z0fP05+Ze+6c3+TmATkG5IVRowgqRQiYw4lYzTL5KSaD2LKwUcyQohP+5wXO5zWj vmt/t2CVPs6XzxeBJRBzCNt/tCEbj0XPlii1leOEwlOwd8yfXSIsRfMu5O2L52y96u 3iCyxljMxypZwex+udsCBkxomvfhVp9yuulP+H/AzCE/b7y318KXzoFIZ5qLddRgaG LX0inZStITGNsR3pOfxOiFhrFUIGd+9bamrMkR/IJCne5A1KJL/wZcN+llO4DLoNPl Y+Mfj1L2VlQKQ== Message-ID: <64ae7870-0ac2-49f2-bd0d-fbb25aec5828@kernel.org> Date: Wed, 28 Jan 2026 16:52:51 +0100 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 1/3] dt-bindings: i2c: Add CP2112 HID USB to SMBus Bridge To: Andy Shevchenko , Conor Dooley Cc: Danny Kaehn , Rob Herring , Krzysztof Kozlowski , Benjamin Tissoires , Andi Shyti , Conor Dooley , Jiri Kosina , devicetree@vger.kernel.org, linux-input@vger.kernel.org, Dmitry Torokhov , Bartosz Golaszewski , Ethan Twardy , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, Leo Huang , Arun D Patil , Willie Thai , Ting-Kai Chen References: <20260127-cp2112-dt-v13-0-6448ddd4bf22@plexus.com> <20260127-cp2112-dt-v13-1-6448ddd4bf22@plexus.com> <20260127160217.GA3776731@LNDCL34533.neenah.na.plexus.com> <20260128-magnificent-faithful-otter-c4f900@quoll> <20260128-pelican-silenced-cd6a5bf69672@spud> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 28/01/2026 16:51, Andy Shevchenko wrote: > On Wed, Jan 28, 2026 at 03:06:58PM +0000, Conor Dooley wrote: >> On Wed, Jan 28, 2026 at 02:49:39PM +0200, Andy Shevchenko wrote: >>> On Wed, Jan 28, 2026 at 11:35:25AM +0100, Krzysztof Kozlowski wrote: >>>> On Tue, Jan 27, 2026 at 10:02:17AM -0600, Danny Kaehn wrote: > > ... > >>>> That's actually rule communicated many times, also documented in writing >>>> bindings and in recent talks. >>> >>> Does DT represents HW in this case? Shouldn't I²C controller be the same node? >>> Why not? This is inconsistent for the device that is multi-functional. And from >>> my understanding the firmware description (DT, ACPI, you-name-it) must follow >>> the HW. I don't see how it's done in this case. >> >> The i2c controller should probably be in the same node too, unless it >> would cause conflicts between function (e.g. inability to figure out if >> a child is a hog or a i2c device). I would like a rationale provided for >> why the i2c controller is in a subnode. > > I can expect a disaster with such a scheme, splitting multi-functional device So for some years no disaster happened, at least nothing was reported to us. Best regards, Krzysztof