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=-8.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 31204C2BB1D for ; Thu, 12 Mar 2020 23:01:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0AE0C206F1 for ; Thu, 12 Mar 2020 23:01:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="nLveb5Qc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726770AbgCLXA6 (ORCPT ); Thu, 12 Mar 2020 19:00:58 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:33724 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726752AbgCLXA6 (ORCPT ); Thu, 12 Mar 2020 19:00:58 -0400 Received: from pendragon.ideasonboard.com (81-175-216-236.bb.dnainternet.fi [81.175.216.236]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 0EB8E5F; Fri, 13 Mar 2020 00:00:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1584054055; bh=jnmOzIxaCTZh1F1zNSt0BgEhkqnAzDOwvfCybQjDan8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nLveb5QcQBAu4GpysEGt6gXx3fDGzyxucsJXf77FqzvYBnyukI3CNdTOgqTGWljmm Xd8xT0JYCJk0uT7dXNeXlNsQ+vWy/dj/gNzi5x9j0xtJL3Qy7HhP9ZrdN7Xkks4Uy5 d28ZIca83jrqkAZVN6CChdChqYy4yPi5QLT5Xgp8= Date: Fri, 13 Mar 2020 01:00:51 +0200 From: Laurent Pinchart To: Lad Prabhakar Cc: Mauro Carvalho Chehab , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Rob Herring , Mark Rutland , Sakari Ailus , NXP Linux Team , Magnus Damm , Ezequiel Garcia , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, Fabio Estevam , linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 2/3] media: i2c: ov5645: Switch to assigned-clock-rates Message-ID: <20200312230051.GA30932@pendragon.ideasonboard.com> References: <1584047552-20166-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> <1584047552-20166-3-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1584047552-20166-3-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org Hi Prabakhar, Thank you for the patch. On Thu, Mar 12, 2020 at 09:12:31PM +0000, Lad Prabhakar wrote: > This patch switches to assigned-clock-rates for specifying the clock rate. > The clk-conf.c internally handles setting the clock rate when > assigned-clock-rates is passed. > > The driver now sets the clock frequency only if the deprecated property > clock-frequency is defined instead assigned-clock-rates, this is to avoid > breakage with existing DT binaries. > > Signed-off-by: Lad Prabhakar > --- > drivers/media/i2c/ov5645.c | 24 +++++++++++++++++------- > 1 file changed, 17 insertions(+), 7 deletions(-) > > diff --git a/drivers/media/i2c/ov5645.c b/drivers/media/i2c/ov5645.c > index a6c17d1..6cd16c5 100644 > --- a/drivers/media/i2c/ov5645.c > +++ b/drivers/media/i2c/ov5645.c > @@ -1055,6 +1055,7 @@ static int ov5645_probe(struct i2c_client *client) > struct device_node *endpoint; > struct ov5645 *ov5645; > u8 chip_id_high, chip_id_low; > + bool set_clk = false; > unsigned int i; > u32 xclk_freq; > int ret; > @@ -1094,10 +1095,17 @@ static int ov5645_probe(struct i2c_client *client) > return PTR_ERR(ov5645->xclk); > } > > - ret = of_property_read_u32(dev->of_node, "clock-frequency", &xclk_freq); > + ret = of_property_read_u32(dev->of_node, "assigned-clock-rates", > + &xclk_freq); You shouldn't read the assigned-clock-rates property, you should instead get the rate from the clock with clk_get_rate(). > if (ret) { > - dev_err(dev, "could not get xclk frequency\n"); > - return ret; > + /* check if deprecated property clock-frequency is defined */ > + ret = of_property_read_u32(dev->of_node, "clock-frequency", > + &xclk_freq); > + if (ret) { > + dev_err(dev, "could not get xclk frequency\n"); > + return ret; > + } > + set_clk = true; > } > > /* external clock must be 24MHz, allow 1% tolerance */ > @@ -1107,10 +1115,12 @@ static int ov5645_probe(struct i2c_client *client) > return -EINVAL; > } > > - ret = clk_set_rate(ov5645->xclk, xclk_freq); > - if (ret) { > - dev_err(dev, "could not set xclk frequency\n"); > - return ret; > + if (set_clk) { > + ret = clk_set_rate(ov5645->xclk, xclk_freq); > + if (ret) { > + dev_err(dev, "could not set xclk frequency\n"); > + return ret; > + } > } > > for (i = 0; i < OV5645_NUM_SUPPLIES; i++) -- Regards, Laurent Pinchart