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 0DD0D16D4D4; Mon, 27 May 2024 14:38:24 +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=1716820705; cv=none; b=BYe4aGTBgivPvfbJGUsTgpDluJJeZy2usHtVHaJ8sME4T3rskAb13heXHa90dmLBs7vJ0CR6UQR1jRwMwJwC2CAkiaYffa7z16btri9Tgu8gMsKgVZHt4P5d7oHea+Hc1v6H7w7r9Z/gj5WO+GBgusjlZ0UtTQdQaOY/erF+j+M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716820705; c=relaxed/simple; bh=LYrxo21W1bsyvjfXuzeaTk8JC1rRC2D0zdpW+2zRoSU=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=DOdyaXG/Xm2Mbq6uNY3qyY0VfbY/BgJB+v0ttGXEkrrzaMuWt5TSLsK9bctc608H14Z5OUnBmY/jSnXhF5LVz/9TQivUzcnki874KlvC3O01kEIkJTj6Yxlq2oRZcAM2+lFBS5zTLq/sYvEiTpM2e8rz3GQ517I+4RfWivMnKgg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ql3U8QUD; 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="ql3U8QUD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFF29C32781; Mon, 27 May 2024 14:38:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716820704; bh=LYrxo21W1bsyvjfXuzeaTk8JC1rRC2D0zdpW+2zRoSU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ql3U8QUDFQX5VUUIvPoFuIKCS7Xuc+wyXk4E60IlPLYYE4ZO0vLXIT5C+oUPjp9mZ L7Kzv8UkvZ2YMK7FPVrcNwtjvg+OgGeb+NnIrCLre1pmds+PjbMp18qniWCgZM5xe5 8B4J4dtDJrhakp5vSNn7+HId5oNT1yzXunGmqVUO1fzqkLZCEkvkKUldznq5+Q+Eea GJwva9ipWej7AH/ZeJT3U7TbgX2u6U7uUsLVsr1N1Vc2qAyxoeyZXKlsITobvYUr2x 1FLkq4+kHcbcIL1+8cT2JeJc/yKbZU0GStCBqqrDBmUaW9SK6TywEljZXkiQEMsiQF qM87b9M7Pt83Q== Message-ID: <4f4db483-6042-4f85-9c64-8d3ad9290506@kernel.org> Date: Mon, 27 May 2024 16:38:19 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] dt-bindings: i2c: gpio: Add 'transition-delay-ms' property To: Bastien Curutchet , Peter Rosin , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Peter Korsgaard , Wolfram Sang Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Petazzoni , herve.codina@bootlin.com, christophercordahi@nanometrics.ca References: <20240527113908.127893-1-bastien.curutchet@bootlin.com> <20240527113908.127893-2-bastien.curutchet@bootlin.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 27/05/2024 13:39, Bastien Curutchet wrote: > The i2c-gpio-mux can be used to describe a multiplexer built upon > several i2c isolators having an enable pin (such as LTC4310). These > isolators can need some time between their enable pin's assertion and > the first i2c transfer. > > Add a 'transition-delay-ms' property that indicates the delay to be > respected before doing the first i2c transfer. > That's quite limited hardware description, comparing to cover letter. Please provide full description here, not in cover letter. This is the binding, so the hardware part. Anyway, this does not look like property of mux itself. If there is no isolator, the mux would work fine, right? Then why you are not adding this property to every possible bus and I2C controller? I2C isolator could be placed there as well. So just like RC binding, that's not a property of I2C mux. Maybe this fits usage of GPIO RC / delay binding. Best regards, Krzysztof