From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E663C8300B for ; Thu, 30 Apr 2020 10:12:13 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4C88620575 for ; Thu, 30 Apr 2020 10:12:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="el8DUWu2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4C88620575 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=OwIMCssnVkTuc2ALfFKg1+2C9iR3GpwI+F0yJH38Kio=; b=el8DUWu2QYI2kX Oj62kEyfwmGY8q8tWJ5DpqXqrIdwnIvU1K1DwV45W9f6uIGYrEyWvDi5QO64NHYVi8jp//qacgoAF fxNr7KQBEuwDdYOd/MmHMjgr0dzeeeHe9D9f6o+h+jlupb/4qL9GRA+ViW7Bg3XXBv1/69u/ZlLjq +koc3UKh8IK5xBaBcASrbFphlcFBsUcfEXL1h83yMKMGtqWPUfCZURH2cQ1wInYRj4T9bg3l8V4hE j1ERN1qTvCfwd51uPDDZRm0hLLiTR+GCXrchSJiXzbbw3VhWYU5gCHp+9KERuEpmn/RdwDxCK8tN+ jSlCyoRjk2KXI66fz6uQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jU6Au-0004Pl-O0; Thu, 30 Apr 2020 10:12:12 +0000 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jU6Ar-0004OT-SI for linux-arm-kernel@lists.infradead.org; Thu, 30 Apr 2020 10:12:11 +0000 Received: from dude02.hi.pengutronix.de ([2001:67c:670:100:1d::28] helo=dude02.lab.pengutronix.de) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jU6Ah-000826-Ty; Thu, 30 Apr 2020 12:11:59 +0200 Received: from mfe by dude02.lab.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1jU6Af-00047P-AG; Thu, 30 Apr 2020 12:11:57 +0200 Date: Thu, 30 Apr 2020 12:11:57 +0200 From: Marco Felsch To: Sakari Ailus Subject: Re: [PATCH v6 2/3] media: ov8856: Add devicetree support Message-ID: <20200430101157.GD2188@pengutronix.de> References: <20200429162437.2025699-1-robert.foss@linaro.org> <20200429162437.2025699-3-robert.foss@linaro.org> <20200430093524.GB2188@pengutronix.de> <20200430094549.GF867@valkosipuli.retiisi.org.uk> <20200430095332.GC2188@pengutronix.de> <20200430095907.GG867@valkosipuli.retiisi.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200430095907.GG867@valkosipuli.retiisi.org.uk> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Uptime: 12:00:34 up 68 days, 21:17, 162 users, load average: 1.44, 7.88, 6.50 User-Agent: Mutt/1.10.1 (2018-07-13) X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::28 X-SA-Exim-Mail-From: mfe@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-arm-kernel@lists.infradead.org X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200430_031209_909819_F26BBF74 X-CRM114-Status: GOOD ( 16.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, Dongchun Zhu , linux-kernel@vger.kernel.org, Robert Foss , Tomasz Figa , Maxime Ripard , Andy Shevchenko , Fabio Estevam , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 20-04-30 12:59, Sakari Ailus wrote: > Hi Marco, > > On Thu, Apr 30, 2020 at 11:53:32AM +0200, Marco Felsch wrote: > > Hi Sakari, > > > > On 20-04-30 12:45, Sakari Ailus wrote: > > > Hi Marco, > > > > > > On Thu, Apr 30, 2020 at 11:35:24AM +0200, Marco Felsch wrote: ... > > > > > - if (mclk != OV8856_MCLK) { > > > > > - dev_err(dev, "external clock %d is not supported", mclk); > > > > > - return -EINVAL; > > > > > + if (!is_acpi_node(fwnode)) { > > > > > + ov8856->xvclk = devm_clk_get(dev, "xvclk"); > > > > > + if (IS_ERR(ov8856->xvclk)) { > > > > > + dev_err(dev, "could not get xvclk clock (%pe)\n", > > > > > + ov8856->xvclk); > > > > > + return PTR_ERR(ov8856->xvclk); > > > > > + } > > > > > + > > > > > + clk_set_rate(ov8856->xvclk, xvclk_rate); > > > > > + xvclk_rate = clk_get_rate(ov8856->xvclk); > > > > > } > > > > > > > > Why do we handle the clock only in DT case? Is there a problem with the > > > > clock handling and ACPI? > > > > > > Not really, it's just that ACPI does not provide an interface to the clocks > > > as such. > > > > But you will get a clk by devm_clk_get()? > > No, because ACPI does not expose one to drivers. Effectively the entire > power sequences are implemented in ACPI, not in the driver. > Ah okay, thanks for the explanation. I'm really not into the ACPI stuff.. So this means the __power_off / power_on should only be done if we are using DT's? Regards, Marco _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel