From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 75777C02185 for ; Sat, 18 Jan 2025 09:14:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=NZMXgDSbnWZHpGzpPRtNfl4EmQSfseJ3TepsemcClTg=; b=CJ+q2NGZRcHXufHszvQfrywaDM 3+Ck2ug0656py/Kv4t4glb0w7TZHb6qsI8ljTrlyUUE93eaPRf3+l4ERbjDC8QmihGPSjq6eg4zyI z6GdiG+H2uf8jtj5sGk6DyZY2FCFpz7Pjc/L2iGQF0Uk4My8Oho6P4PjM1uj7Qu58mw4flFn74bLU Wdr3ENVZxVrla3TicBYytS0kHJQMPyN0SPXTGDrCN2cyXxS+JJeP79CCUfCXH9WwUXo5C9uIk5jDj nFNgpfT5jJPrT62BHMZF6r0F+Ypn8xaRFj9tETXHtWDhW8avbCXagntZcLLJQsysoKfgerFZpCqVG iYTbZNag==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tZ4uX-000000025cw-1mO3; Sat, 18 Jan 2025 09:14:33 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tZ4tG-000000025YI-3JO2; Sat, 18 Jan 2025 09:13:16 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 876A05C4982; Sat, 18 Jan 2025 09:12:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 376C1C4CED1; Sat, 18 Jan 2025 09:13:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737191593; bh=MUQ5voLVemt+kelhaaFIJwaMgdhz0IGii3dF1Sgvl/4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=SH+nbyF5pfP92lYbAZViosCRfe7m0iFRe41lx1vaCB/jhLDZZfxXCWExWGRjP6Tt1 QjbcNFNuHMQH8PToGCoKQqszn4kDKxXSIrGdSxDMO2fI+EsmLNuBJ76SEILgtc6JHv 0orsSQ7Dqh1vnWe8m+mUaUHyIatpIMWbptRZldVSjhFccFzi+tzM9hhkyFptHrQxaZ kYaCuZ5Ei0jd5nLt19HaTDQd34JqE9+XCXL1mLQc8Vy0qMBy2XxptrYdmwDOckJkYH J0L6a1tSil/RDsl9URsnB12IjSI6GwHAFpXvh0nfgqm6dB8atpQ1t2EWlgsxsRRsUD 1F1IclRR/HriA== Message-ID: <76ab492e-ae9c-46eb-bf2e-d794863baf8d@kernel.org> Date: Sat, 18 Jan 2025 10:13:06 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/2] dt-bindings: pinctrl: mediatek: add support for mt8196 To: AngeloGioacchino Del Regno , Cathy Xu Cc: Linus Walleij , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , Sean Wang , Lei Xue , wenbin.mei@mediatek.com, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Guodong Liu References: <20250110104703.13625-1-ot_cathy.xu@mediatek.com> <20250110104703.13625-2-ot_cathy.xu@mediatek.com> <66218a3c-04c5-42ea-ba9c-e0fbc72ed16f@collabora.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250118_011314_937474_48FDCE2D X-CRM114-Status: GOOD ( 17.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 13/01/2025 14:20, AngeloGioacchino Del Regno wrote: >>> + >>> + properties: >>> + pinmux: >>> + description: >>> + Integer array, represents gpio pin number and mux setting. >>> + Supported pin number and mux varies for different SoCs, and are >>> + defined as macros in dt-bindings/pinctrl/mt8196-pinfunc.h >>> + directly, for this SoC. >>> + >>> + drive-strength: >>> + enum: [2, 4, 6, 8, 10, 12, 14, 16] >>> + >>> + drive-strength-microamp: >>> + enum: [125, 250, 500, 1000] >> >> Why duplicating properties? No, use only one. >> > > The problem here is not entirely about duplicating properties, and I'm not > sure that the reason is actually acceptable (but being this a special case > the `description` field would be mandatory to have IMO!!). > > So, the reason for this separation is that the drive-strength-microamp does > activate a special feature in the controller called "advanced drive strength > mode", which is switching to different shunts that will decrease the power > efficiency of the chip (by an ignorable amount, if that's one pin - but if > that goes to something like 100 pins, it's not ignorable anymore). > > I'd be happy if we could let them retain both properties after putting a > clear description of what's happening and why there are two of them. It would be fine then, but please add some sort of description to these fields documenting that difference. Best regards, Krzysztof