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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=em10dXw7; 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 DE108606A321; Thu, 22 Oct 2026 07:08:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=em10dXw7 Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6ECE1F000C2; Thu, 22 Oct 2026 07:08:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792652894; bh=fgWzHiJ6sd4DhFEtsNGAAch+iFtzd00wLbBfGrtrfJY=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=em10dXw7HIvwH+ncXfHetDTSh1J957nxK22EuuVEHvJVF72N+wfD2iXpztgua/UWI lnwGvex4a/chAazdCcBSgLAZY2AFv56K2fMUzOhIRBI8le96v4ZIMjo1G4bQDuAcDV PCSQihp4QVeMNS7/J+2YibKB1NRRSKsKpF7BrwHnBRy5vHJOIMY4LbkQw90MpydWv+ xb+CBbGf7YijTTAwsxyvJ8UGwbYv3hCuUf7goT8kpefdSIb6U5ecJDfuLbTqfA2dVN H3SUqB+jJAqkuJXvmZm1bbmWofO0Rk5w6Akn/3nPOo7sY804TfDI/WFlAqy+OCxNsN u6lb1haY19Vqg== Message-ID: Date: Thu, 22 Oct 2026 09:08:09 +0200 X-Mailing-List: devicetree@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 1/5] regulator: dt-bindings: Add regulator-boot-force-off property To: Paul Louvel , Conor Dooley Cc: Liam Girdwood , Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Thomas Petazzoni , Herve Codina , Miquel Raynal References: <20261021-paul-lm51772-v1-0-25f0ffbffa8d@bootlin.com> <20261021-paul-lm51772-v1-1-25f0ffbffa8d@bootlin.com> <20261021-wind-reopen-490475bc470d@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 21/10/2026 19:11, Paul Louvel wrote: > On Wed Oct 21, 2026 at 7:01 PM CEST, Conor Dooley wrote: >>> + regulator-boot-force-off: >>> + description: a regulator may be enabled by default when the system powers up. >>> + A consumer may query the regulator's state during boot and disable it if >>> + it is already enabled, potentially resulting in an unbalanced disable >>> + operation. This property ensures that the regulator is disabled at boot, >>> + regardless of its previous state. >> >> To be honest, I'm not sure how the commentary about querying the state >> or being unbalanced is relevant to the description - that sounds like >> something specific to the linux regulator framework? > > Yes it is. Maybe I miss something, does this binding is used outside linux ? > >> >> In fact, I'm not sure why this is needed at all? Can't you just change >> the software so that it is okay to disable a regulator that has an >> explicit enable count of zero? >> > > Do you mean by calling regulator_force_disable() instead ? I thinked about that > but I don't think this is ideal. > Or just patch the core to allow unbalanced disable downstream ? > My intent was to provide an upstream solution to the problem I described in the > cover letter. Cover letter does not end up in Git history often, so this patch needs rationale. Honestly this looks like duplicating regulator-boot-on property in a reversed way, while also focusing on Linux implementation. And even when considering Linux implementation, the unused regulators ARE turned off, thus there is no need to force them off. Best regards, Krzysztof