From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=178.238.236.174 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793007469; b=kYq+JRbA8GFlkXOZxoLchHO9Hs3RFGV/JS/sB1YUKmuK+Wv135Q0AkrBYY+rqcRvIYWZ 7SK/rhrEuG+XIV+gm1hXC/6pL53dBYJjBwYvmOBQ9xsOzrCGgDiD8+/MHGc6HC/OjXgZz RC6nEMD2HqaG+QoLKEv3rCMhLcx/8Q2PKHED/PgXnKk3mZXtvyAeVwk59XvYAgmtdIxEa oZYmh/XbUh2LIi7NazarZcXGjRFwiBhPvGe8p4pZ5MfiuYHvV5CejdB7exa3SuejumyS1 66542xABUrZxe0phnTTqM4aOwcJp7dNniSwCDnjNTF0amwJ3T2HncOwILoWc4Z480xQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793007469; h=DMARC-Filter:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: In-Reply-To:References:X-Mailer:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=UmXjLJOP0mzdBm7GFoPR8yYMqhsvVQOQgwUqLKU0OJM=; b=kJdrWHBF5c7XAc1T+H7qM0jgg/LqbImF+xT4U7HKK7S82+inFIOLhXdSDFJPXLR0X/JK emrtLzWDA/sRjPYjgrqwp7YwNcflyeMtxvnB1C77qKiNyWJvAiWt/ceXbAxBFUGN470R1 lJYM5uNQyPPYki6jbDTVhgn7l2jc9pq3kSU+pdak8nED8lA4yqf4OF1VR9M/1ME4vkX9s vCcaNgymidz3Sd87L+Wnmm36ssdzjYlm/bT9IEfiBm7IVlAMo6U2fEGyu6XUC6vBGlfvD gVNbVffyFneibkhvGzCSv84OH7D7l/KmjF2/waoaaVK9kg7DkG6k4HSF+fXgDQdq96g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=kemnade.info; spf=pass smtp.mailfrom=kemnade.info; dkim=pass header.d=kemnade.info header.i=@kemnade.info header.a=rsa-sha256 header.s=20220719 header.b=QWZhw8w4; arc=none smtp.remote-ip=178.238.236.174 Received: from mail.andi.de1.cc (mail.andi.de1.cc [178.238.236.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8469E606A31A; Mon, 26 Oct 2026 09:37:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 8469E606A31A Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=kemnade.info Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kemnade.info Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kemnade.info header.i=@kemnade.info header.a=rsa-sha256 header.s=20220719 header.b=QWZhw8w4 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=kemnade.info; s=20220719; h=References:In-Reply-To:Subject:Cc:To:From: Reply-To:Content-ID:Content-Description; bh=UmXjLJOP0mzdBm7GFoPR8yYMqhsvVQOQgwUqLKU0OJM=; t=1793007469; x=1794217069; b=QWZhw8w41+a4kOuxG1p3BX45Tc3xsasC2I8+s8kM/cDcjTDueHdyrzPj4PPaxI/8dwuIHAnFKoO eyP+D9gFE2OqrVkI3F1Sr9vSUrbNiCRJguXow0pmNnUMgnDrOKwEIJr0Ch+H+NW2K55Q3aVje2pZa sWW8ieoK9+W+pVbVS4ZKe4kwUUStNPwtNVHETgQGvwxnuVJcAn0K2FSPuX619IWaK5sZnf82n3dIr UO/eCR1mQIN3fCQ2c74Qwr1iiqIpAljSVYv3UiPRiHuUr6JEKNnTDCBnKajFxI1IVGO9L7iJm1fTf NRd5w5SkW/8p858TaqV6K7ocsFTxeoxtSzcQ==; Date: Mon, 26 Oct 2026 10:37:30 +0100 From: Andreas Kemnade To: Pablo Mazzini Cc: Mark Brown , Liam Girdwood , Guenter Roeck , Lee Jones , Frank Li , Sascha Hauer , Alistair Francis , Pengutronix Kernel Team , Fabio Estevam , devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-hwmon@vger.kernel.org, mfd@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/7] sy7636a: power the panel only during updates Message-ID: <20261026103730.3a79c2e6@kemnade.info> In-Reply-To: <20261026003918.155321-1-pmazzini@gmail.com> References: <20261026003918.155321-1-pmazzini@gmail.com> X-Mailer: Claws Mail 4.3.1 (GTK 3.24.49; aarch64-unknown-linux-gnu) 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 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 26 Oct 2026 00:39:11 +0000 Pablo Mazzini wrote: > The SY7636A hwmon driver keeps VCOM on from probe, so a display driver > can not power the panel only during updates. > Yes, that is the common use case, power things on, tune update process to the temperature, update, power off. So it makes completely sense. > Read the temperature in the regulator driver instead, as the TPS65185 > and FP9931 drivers do, and remove the hwmon driver. Boards that relied > on VCOM staying on mark it always-on. The regulator also switches VCOM > with VCOM_EN, gains VCOM voltage control and binds to the I2C device > directly. > > Tested on a PocketBook Verse (B288). > Which kernel do you use? Just curious, maybe some further upstreaming actions might be coordinated or cross-reviewed. There was discussion about in-kernel hwmon readout interface like it exists for iio. Regards, Andreas