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 6110E1F239B; Fri, 16 Jan 2026 14:28:38 +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=1768573718; cv=none; b=XfeIq6kHL0Lotr+BUNd4OjLrCDJBaU8TtS403My5MPThG4tL8Tfxod9OmuBCZUvz65g0ktR9g151JcH57BDyY0wN2HFiR9XAGnhONPkHtF6ysPfRhX9uYm5HnXPvQJIE+ZU+nkDEn6ZJpo1iL7Zbo1ULQG2a3+516jeYgOvOhEA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768573718; c=relaxed/simple; bh=+OsmBgHNI7Oz1hVZA4HuwAipKv/OvOKHauxS2k1pc5s=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ElNuq6TBv2wANHZ/dqobP5irXqf5etQOI6uHDeaIrsGTXYpge3WBSTmTtg1ePTHHtvCi2X/SWRwq+QbMFU07q5i4u5PD4FhJWs6oXQHV2qMRAFh8jah/PLCuc2WfsESQYx9cziq6KZIczTm6pqo80RYM13iyvH5n22zvlXrxKEU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VVRWz0O7; 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="VVRWz0O7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDD37C116C6; Fri, 16 Jan 2026 14:28:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768573717; bh=+OsmBgHNI7Oz1hVZA4HuwAipKv/OvOKHauxS2k1pc5s=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=VVRWz0O7JYNLyTrNftTazoizuA3k4F9FLqX+ROqRbcfUj9c1fQiTcOKi0bwHtU/Po TrX7z5KlbFZNDon5KWKcOkLJ7sodTLIA7colg5Z9/4twuDulLgz3nG98PBqL9svakF SyDM6LAAu/pYVZ/Kfg3HRcbjne0x0eIP9Vl9AS3MyDxUGE7ErVLoKbDCDPpbcobMaT SBNNJZMkg/3nqjbOlGeznapx7wC/OUS11dtYKuUbAJU73aflr/HxmXMC6Sq+4/+SmM ncHENgotvjZWKXhS1woMbHKvghkp2lCpMR/qRRamypLJWB9M3ttV6/XfQpYPymNUK6 udufR4wVQGEPg== Message-ID: <9c1b12fb-2c30-4610-8262-5c615e1ac982@kernel.org> Date: Fri, 16 Jan 2026 15:28:33 +0100 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 1/2] dt-bindings: pinctrl: renesas,r9a09g077: Document pin configuration properties To: "Lad, Prabhakar" , Conor Dooley , Linus Walleij , Geert Uytterhoeven Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Magnus Damm , linux-renesas-soc@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Biju Das , Fabrizio Castro , Lad Prabhakar References: <20251014191121.368475-1-prabhakar.mahadev-lad.rj@bp.renesas.com> <20251014191121.368475-2-prabhakar.mahadev-lad.rj@bp.renesas.com> <20251016-dimmed-affidavit-90bae7e162aa@spud> <20251208-headgear-header-e17e162f0f52@spud> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 14/01/2026 21:53, Lad, Prabhakar wrote: >>>>> What are the meanings of "0" and "1" for slew rate? Why isn't this given >>>> I'll add a description for it (0 = slow, 1 = fast) and the same values >>>> are programmed in the register to configure the slew rate. >>>> >>>>> as the actual rates? The docs surely give more detail than just "slow" >>>>> and "fast". >>>> You mean to represent slew-rate in some sort of a unit? >>>> >>> Based on the comments from the HW team, there is no numerical >>> definition to represent slow/fast It only defines a relative >>> relationship. >>>>> >>>>>> + renesas,drive-strength: >>>>>> + description: >>>>>> + Drive strength configuration value. Valid values are 0 to 3, representing >>>>>> + increasing drive strength from low, medium, high and ultra high. >>>>> > I got the feedback from the HW team "The RZ/T2H drive strength > (driving ability) is expressed using abstract levels such as Low, > Middle, and High. These values do not correspond directly to specific Hold my beer and let me design PCB... I will use high voltage power supply, then small resistor and small capacitor. Ah, and that regulator here should operate on medium/middle voltage. Looks about right, all ready to send to fab! > mA units. To determine how much current the pin can actually drive, > the engineer must refer to the electrical characteristics table. > Therefore, the drive strength in RZ/T2H is a parameter that switches > the internal output transistor mode rather than directly representing > a physical drive current. > Consequently, expressing RZ/T2H drive strength in milli- or > micro-amps, as suggested by the reviewer, is inappropriate. To > accurately reflect the SoC's hardware specification, introducing a > custom property is essential." So the hardware team tells you how you should model DT - "introducing a custom property is essential". That's pretty bold statement and very poor language construct. It is not hardware team which decides how DT should be written. Best regards, Krzysztof