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 3EDE14A4828; Thu, 10 Sep 2026 15:58:33 +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=1789055915; cv=none; b=DN9NzEdI+awDcFLRXXAaMDNDuvlRVbDgDNwhgZD6np9FccPLQegyQuitX3Ua7eX+ExYMejOK3FJ6rm0OtxwA/owqGRb5Cvrn3q/5xvmzAlgEq7g69Ays58kGhSLwakCkpPU+wYNe/bjWZ2LP8sby7ElOS6eKlid/QWJn46GgLig= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789055915; c=relaxed/simple; bh=mtivQnJuoyYZo/CHk4ap6/0IFAKN/CSN0eD/OxTrYQY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=XsUYG1emo4HBP2vbANaQlKEUUlG/z6uGGbpswSqD5m9RLnsOKVyALK30A//HoQOPUjXFPOFkvT7gerAn9ACc9FGDyCPwZ5m4OEOUwWWRIr0P1H5lZs8Ti46tHa2SJSXUNPXtMR3obqtQ/XFFcSjVBwZaYDL8OEDKV0yPqPZH6mI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=WhFVnzp5; 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="WhFVnzp5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22A0A1F000FF; Thu, 10 Sep 2026 15:58:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789055913; bh=mtivQnJuoyYZo/CHk4ap6/0IFAKN/CSN0eD/OxTrYQY=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=WhFVnzp50ZMzAinzBu3+V+LxJiL1ETZLztYuPRaNmD4TM4LKH/tAzaI2k4vHvEpre KxvckaZoIhhd9MHHc+efQJYCjh4tGIKCBWxLjXNmR94nJsyP9HlJRxsg5Rwiwby43X 7u9k+c9OZpGPuWTZT6YPWziNRLZPks+rO19mGp5zbiLXc++8pB2lTvxzek1tRJssuq roSU2s26UpZfbbdc0ZX+Hc9873iqBs6UycCnsSn2KTOWvf/9VWMEaJx377cvOpi2gH CeR18u+EGJTzrdeammoAGOSALcrV9t9ITn16TSRjqTyJ3Sr3bbYqsf0inJDWZNr0yB k9t5c2vFTaNlA== Date: Thu, 10 Sep 2026 16:58:29 +0100 From: Mark Brown To: Tapio Reijonen Cc: Saravanan Sekar , Liam Girdwood , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH 0/2] regulator: Add MPS MPQ4210 buck-boost regulator support Message-ID: References: <20260910-mpq4210-regulator-v1-0-d37e208dfc8d@vaisala.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="tsE3q8oCInVXG8I9" Content-Disposition: inline In-Reply-To: <20260910-mpq4210-regulator-v1-0-d37e208dfc8d@vaisala.com> X-Cookie: The star of riches is shining upon you. --tsE3q8oCInVXG8I9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Sep 10, 2026 at 08:51:40AM +0000, Tapio Reijonen wrote: > One consequence of the hardware worth spelling out: the MPQ4210 does not > respond on the I2C bus while EN is deasserted. The enable GPIO is > therefore claimed and asserted before the first register access and held > for the lifetime of the device, rather than being handed to the core as > regulator_config::ena_gpiod, which would drop the bus along with the > output. This is what regmap's cache only mode is for. --tsE3q8oCInVXG8I9 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAABCgAdFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAmqi06QACgkQJNaLcl1U h9AwXwf9EhDfR+7s0wsF+PpKppfHYz5n4/Q4A48fnAZvCChWNjKGdobPaZxQry4x a9cejgulmZQuLjxj6dgurEKNodEyQaGeSR3hdhwQ4oPEL2ouqbgbeQML0qJDaIEi g/rIGulc8gk/2TbV9FNBZcnJcSJo9wW1pD3l+nnHvifNpMvFwuRf587nEJ9DvHGA YWZiBaer6qX5qbGSZpAkbWVgZVtsAIPchvTXPVEkZLFRoZ/rLSxWH8mBkBWZbg4L Qn9S8gmqo1jehPILbBIF+/cgfFfisdyIUdMuWWMjRYnVUaUzmzGO8ozLfQmDJtak 9t3YgDAd1xNdbWCmwvq51M1ABOoBrw== =ZQQS -----END PGP SIGNATURE----- --tsE3q8oCInVXG8I9--