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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=lCPWC5Pq; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09C78606A31C; Wed, 11 Nov 2026 12:11:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=lCPWC5Pq Received: by smtp.kernel.org (Postfix) with ESMTPSA id E562C1F00A05; Wed, 11 Nov 2026 12:11:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794399080; bh=gmPR0FedAKJql2EJ2Bc62+0bi0fawdbdAWLRYaD0g2Y=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=lCPWC5Pq9tGP1K5OOhOWJqUNfy97tqlliU6Otcd3NMRkYYdgC4+8EyPAbPQ/XaUyb /7CKBi3ORoD9RCr0BO+XFTourHZcbwhgNLROkHFlifvUWVQsz3tHTCeQDJZiKb7EOB 7s9iJggT33t9RfiD0aPhwBjvzLkF8VDptrApobg7FH0Un9dPcWutSGaw5zPl3gsBDO kpXyFaqTu7qEpBFYpXR53vG/jH9NpMbR9QfC0hmU+L/zKftTfPuk4RLd4Tfld9JLyb REDDz9YT00h7in1QvvGySbSccbRf5FlkwnE9YkohiI4RA50UBWpGl09kNcgnBN9/jx dVSnevpw3hlmg== Message-ID: <3bbc1c1a-0435-4cde-a1a2-a408bd7a794a@kernel.org> Date: Wed, 11 Nov 2026 13:11:13 +0100 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] dt-bindings: leds: backlight: add Kinetic KTD3137 To: Daniel Thompson , Roman Vivchar Cc: Lee Jones , Jingoo Han , Pavel Machek , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Helge Deller , dri-devel@lists.freedesktop.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org References: <20261102-6768-ktd3137-v1-0-b5b4f903c56e@protonmail.com> <20261102-6768-ktd3137-v1-1-b5b4f903c56e@protonmail.com> <_kyk4j6fx0PX5QqVrjAIGH-5fzUhj-fKhD8YT4F734mCOnQCDXui6wQB77AOka69_gblWOJN2SxzC5OSrH1lXiQeciLfVnWuPHS0JfaMKD4=@protonmail.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 03/11/2026 18:10, Daniel Thompson wrote: > On Tue, Nov 03, 2026 at 03:21:45PM +0000, Roman Vivchar wrote: >> >> In the driver I've used devm_regulator_get_enable(), rather than _optional(), >> since my understanding is that the non-optional helper is a standard kernel >> API for required supplies (with regulator core warning and fallback to dummy >> regulator in case DT omits it). > > That dummy fallback essentially makes it optional. On a board with an > always-on supply then there is no need to include vin-supply in the > DTB. The driver will work just fine without it. There is a need, because this device needs a supply. How you describe that supply in DTS is a different story - can be always-on, can be missing etc. Best regards, Krzysztof