From patchwork Fri Sep 10 18:41:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Kocialkowski X-Patchwork-Id: 12485753 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 784F2C433FE for ; Fri, 10 Sep 2021 18:42:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 54F6060F5D for ; Fri, 10 Sep 2021 18:42:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232478AbhIJSnb (ORCPT ); Fri, 10 Sep 2021 14:43:31 -0400 Received: from relay10.mail.gandi.net ([217.70.178.230]:43721 "EHLO relay10.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232346AbhIJSna (ORCPT ); Fri, 10 Sep 2021 14:43:30 -0400 Received: (Authenticated sender: paul.kocialkowski@bootlin.com) by relay10.mail.gandi.net (Postfix) with ESMTPSA id B6AEE240006; Fri, 10 Sep 2021 18:42:15 +0000 (UTC) From: Paul Kocialkowski To: linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, linux-clk@vger.kernel.org, linux-staging@lists.linux.dev Cc: Yong Deng , Mauro Carvalho Chehab , Rob Herring , Maxime Ripard , Sakari Ailus , Hans Verkuil , Chen-Yu Tsai , Jernej Skrabec , Paul Kocialkowski , Greg Kroah-Hartman , Helen Koike , Laurent Pinchart , Thomas Petazzoni Subject: [PATCH 02/22] ARM: dts: sun8i: v3s: Parent the CSI module clock to the ISP PLL Date: Fri, 10 Sep 2021 20:41:27 +0200 Message-Id: <20210910184147.336618-3-paul.kocialkowski@bootlin.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210910184147.336618-1-paul.kocialkowski@bootlin.com> References: <20210910184147.336618-1-paul.kocialkowski@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org At reset time, the CSI module clock is parented to the video PLL, which is used by the display engine. While the CSI module clock needs to be clocked at precisely 297 MHz, the display engine will need to adjust its clock usage depending on the display pixel rate. As a result, the video PLL may be reconfigured to fit the need of the display engine, which will break the CSI hardware. A good way to work around this is to reparent the CSI module clock to the ISP PLL (like it is done in the Allwinner SDK). Do this using the device-tree assigned-clock properties. Signed-off-by: Paul Kocialkowski --- arch/arm/boot/dts/sun8i-v3s.dtsi | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/boot/dts/sun8i-v3s.dtsi b/arch/arm/boot/dts/sun8i-v3s.dtsi index 776913b3f85f..a77b63362a1d 100644 --- a/arch/arm/boot/dts/sun8i-v3s.dtsi +++ b/arch/arm/boot/dts/sun8i-v3s.dtsi @@ -622,6 +622,9 @@ csi1: camera@1cb4000 { clock-names = "bus", "mod", "ram"; resets = <&ccu RST_BUS_CSI>; status = "disabled"; + + assigned-clocks = <&ccu CLK_CSI1_SCLK>; + assigned-clock-parents = <&ccu CLK_PLL_ISP>; }; gic: interrupt-controller@1c81000 {