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 0F42C134CF; Sat, 17 Oct 2026 21:28:39 +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=1792272521; cv=none; b=aMM9QpFhKDSKielv0eyIW11n9R+1YJtkSTdVpHaShiO3r032YCWfVYfB4dRILTUbQzO0SNPbWOGj0S5mCG1e5DueqoKRf5MXpxPg3Hh1fDNSmMa1BVBDdDojnWNfRvtCAO3L660G39/SBTIVPj+TfEbZxVElVpAeJX3mGRef8ag= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792272521; c=relaxed/simple; bh=X+lKRu8sRWKE1hyitt1Q8JaNlh/A3yDu4gemrdN5gKc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dVmpTfv7OMy+uaCYbbzsH3lApaU/TcI7RBVUAlVv2Gq3/nxHyJzgKIMNXzX6++FknRNopIn3tsqpggIsE0jHyTwWsMpntSUfwrGmt4GkLz8eGZe3SHSj3VlxsPBB0hm32Pd0vCO7Hb2NQC3Jxt/KXameYhHbdtSr9iMAFR0AzH8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I4D7HjH2; 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="I4D7HjH2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D7EF21F000C4; Sat, 17 Oct 2026 21:28:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792272519; bh=q1BVkb5pmkK8UJqeVh978rmRoLp0JDE22LJYmcbLRJo=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=I4D7HjH2AS1v54dqU+OJHOXlhChdAc8jXe/P8Og6U6nQVeE34BjsxLv48T0qH4941 /W/qqdqljcF1RIXxxs/IHTwqEHv25tp8ze5se7acrAbdEknILi3RG1nf0PHnNgKttP ZdI+n8SKuMzaQZIVbmmSanlHaImO2fSzrq4Oc9P0e0vlZlTbvpFOZDekHsz7Ev99hK os8gGqBTu73sLleGMkSB1Z14voTmZIDADDNJUePfqdn0zAIChu/RU1fZhmVQDw2Y39 0XPm0KSxxU/aVI55uKsiTOT0lvBvyYAEej2dYXds6l6q1hyBY1taAsQalLfuefPcZj wHy2zOrNLjuwA== Message-ID: Date: Sat, 17 Oct 2026 22:28:34 +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: media: i2c: Add OmniVision OV13858 To: Krzysztof Kozlowski Cc: geocausa@gmail.com, Sakari Ailus , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sergey Lebedev , German Pablo Lindo , linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20261015-ov13858-x1e-v1-0-acdd918f4fb6@gmail.com> <20261015-ov13858-x1e-v1-1-acdd918f4fb6@gmail.com> <4359bff8-edb2-486a-8d41-38bd315a4430@kernel.org> <37my1V7zvAlADVEwmO3aSm1XZe6SLHeQnj8AYh3sVO_3mGc4_lWX-abstYbqLBYAZpvFXdbELWYmRoOF-HKavw==@protonmail.internalid> <20261017-successful-sturgeon-of-experiment-9d8caa@quoll> From: Bryan O'Donoghue Content-Language: en-GB Autocrypt: addr=bod@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 17/10/2026 17:57, Krzysztof Kozlowski wrote: > On Fri, Oct 16, 2026 at 09:49:16PM +0100, Bryan O'Donoghue wrote: >> On 15/10/2026 22:48, George Neacsu via B4 Relay wrote: >>> + - clocks >>> + - avdd-supply >>> + - dovdd-supply >>> + - dvdd-supply >> >> The clocks, supplies and resets should all be optional as nothing says Linux >> must control any of those on every system. >> >> i.e. you might have a co-processor or CPLD which owns the reset, power-rails >> and the clock might not come from the SoC. > > That would mean that every other binding/device would have them > optional. What Linux controls or does not, is not really important here > - these are required in the board design. > > Best regards, > Krzysztof Yeah I take your point, they should be optional in the driver. Actually though we don't always know or represent a regulator for example or the regulator can be on a daughter board - as is common on Laptops. What is the DT policy for that ? My own understanding was that it is better to not require all the regulators from the DT description and leave it up to the individual DTs to describe what can be described. Should we have a fake regulator - or reuse one ? OK the LLM tells me that I should have 'regulator-fixed' for that case always-on, no GPIO, so describing a regulator we know exists but can't actually control, hmm. Fair enough, that's the answer. --- bod