From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A0F72606A321 for ; Mon, 26 Oct 2026 09:37:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=So2Qiy4d; 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=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To: From:Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=UmXjLJOP0mzdBm7GFoPR8yYMqhsvVQOQgwUqLKU0OJM=; b=So2Qiy4dnyn4a/ bOIyl/rc+snKyi8yv6acp+FXysD6JZFW4iT3Jelnol05EIiv1dXL/EHAilQ6gtmgyL4xzpCjhYNPB RF1tbOc+gg4Gxk9TmofHq96slP6/Z9kS2lwylulzAX8kJ+eI/3BoF2na+HZmTFByGe4ldHP0Uiscu NRnr1SdDnNDqf6AvYeSC0K0Qlom6b2vx3llVmF4YdtR3a4+e4PxVjc4eqGtpJA8iXOiYXrwk//Pfw skxMjQYeT00BhT6d0pWPGs24uFjsMXct2ybxUSkiMv4/5b7NVzdQZJmnGavdpP+POZyhMK6zhw+ai fVIkZjQJd9/FtymJ/Z0Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLH9L-000000025mM-1e16; Mon, 26 Oct 2026 09:37:51 +0000 Received: from mail.andi.de1.cc ([2a02:c205:3004:2154::1]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLH9J-000000025lV-1haw for linux-arm-kernel@lists.infradead.org; Mon, 26 Oct 2026 09:37:50 +0000 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-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261026_023749_448301_1AC14D8B X-CRM114-Status: GOOD ( 11.67 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-7.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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