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 8208136EA98; Tue, 11 Aug 2026 07:47:10 +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=1786434432; cv=none; b=DF6FPAa6ZNorMNpueXNC8nxziQn1OT55XMJcu/u7ggaMq4qmH2SscjlsKgwZNNTR+SVt1Kya3N4fr9sscEuHaDC8dj7ZFmNKfzutpRkJSfr4MXLXvcN2X89A7Ejsa23LKuXFgbTejWOnUUeXoNCXi7Vaw104rX83cMnzvpFOPXw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786434432; c=relaxed/simple; bh=+QCK5Qihpkqt3y4Ae/K5pIwq9DgY6Rn4MzCxoPHZvxk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=FWojQ1hGUoxKrXhcSeZ2Vck7l/VZCURfbF9yQgJbVSVa/L6STP3obLnh0opSaHNKUZTjf0SnUFBr/WleyL25aQ0veHBx68gzru2kow5xEq/m3KOPFdzNx0U56YRf0LJ8Ry6MPDbB9LcoUfeIbdDW+FVkvJgv22ctgmLOYN9ghls= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L+mH3Mbe; 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="L+mH3Mbe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D24181F000E9; Tue, 11 Aug 2026 07:47:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786434430; bh=+QCK5Qihpkqt3y4Ae/K5pIwq9DgY6Rn4MzCxoPHZvxk=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=L+mH3MbeWxRuXyfRluwmePo17Fn2kvPvjuV18TgBKKb7lpLulonJefqDPidbdGilV SlsgacejIQtagQTar87WxmjevVWQt5xvUvd743198kvMHot3f/edFaEE0/9lIE5/3n qiykarziPHKFxzGVFJKd//TGMC6WPiAUgqmZX/YVF+18kAzjOm83FL4ONPe4qMCL8A 3k0Sk3FsESI1SVACKmK2hjwwKdk2wEmVbRWlQ4m2usZp2+qWT9qeMYHCJMply1BnL2 t/x66OQMGQgbIsdX1jYoR+qJZkIipy6v+8tPb6ekNFe4QFNegvCuHQDvoeWCg7KiS5 rhYVxgMWUi1QQ== Date: Tue, 11 Aug 2026 09:47:07 +0200 From: Krzysztof Kozlowski To: Jorijn van der Graaf Cc: David Heidelberg , Krzysztof Kozlowski , Andrew Lunn , Bjorn Andersson , Conor Dooley , Conor Dooley , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Konrad Dybcio , Konrad Dybcio , Paolo Abeni , Rob Herring , Luca Weiss , devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, oe-linux-nfc@lists.linux.dev Subject: Re: [PATCH v4 4/6] nfc: s3fwrn5: enable the PVDD supply Message-ID: <20260811-simple-impetuous-caribou-1f8596@quoll> References: <20260807021001.239389-1-jorijnvdgraaf@catcrafts.net> <20260807021001.239389-5-jorijnvdgraaf@catcrafts.net> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260807021001.239389-5-jorijnvdgraaf@catcrafts.net> On Fri, Aug 07, 2026 at 04:09:59AM +0200, Jorijn van der Graaf wrote: > The controller is powered by an externally switched PVDD rail. Get and > enable it in the i2c phy probe, before any of the chip's pins is driven > or its clock started, so the chip's power does not depend on whatever > state the bootloader or platform left the rail in. Boards that do not > describe the supply resolve to a dummy regulator, so the existing users > keep working; they gain the regulator core's dummy-supply warning until > their DTs describe the rail. Last sentence is redundant - we know how regulator framework works. What is not redundant and missing is why UART variants do not need supply. Best regards, Krzysztof