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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 79222C7EE2E for ; Fri, 2 Jun 2023 00:42:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233171AbjFBAmE (ORCPT ); Thu, 1 Jun 2023 20:42:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233095AbjFBAl7 (ORCPT ); Thu, 1 Jun 2023 20:41:59 -0400 Received: from mail.hugovil.com (mail.hugovil.com [162.243.120.170]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CB5A195; Thu, 1 Jun 2023 17:41:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=hugovil.com ; s=x; h=Subject:Content-Transfer-Encoding:Content-Type:Mime-Version: References:In-Reply-To:Message-Id:Cc:To:From:Date:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=nwW+FBXmqc2OYPaC0Zr4Z9mFnd0+mBmKkf3uvp6DtKw=; b=pd3gVcINaX3CKKN9X3bkpnyW80 rROQ2P1ke2FUiKtsMs/52nX5VdlgMYA8atkJ/WvMv5Zjb7b7q1ITvgWwx/00o8jTeh5bwa20dYFXB UkxmExH+8MV4qkJEzHmxWVVZGcDkjZ4jTpX1JDS0j8Z5XqTPQj44tiPa+j20AF1DNdd4=; Received: from modemcable168.174-80-70.mc.videotron.ca ([70.80.174.168]:53008 helo=pettiford) by mail.hugovil.com with esmtpa (Exim 4.92) (envelope-from ) id 1q4srN-0008S3-6c; Thu, 01 Jun 2023 20:41:42 -0400 Date: Thu, 1 Jun 2023 20:41:40 -0400 From: Hugo Villeneuve To: andy.shevchenko@gmail.com Cc: gregkh@linuxfoundation.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, jirislaby@kernel.org, jringle@gridpoint.com, tomasz.mon@camlingroup.com, l.perczak@camlintechnologies.com, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, Hugo Villeneuve , stable@vger.kernel.org Message-Id: <20230601204140.3b45c9b97efb36431d058ba7@hugovil.com> In-Reply-To: References: <20230601201844.3739926-1-hugo@hugovil.com> <20230601201844.3739926-6-hugo@hugovil.com> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 70.80.174.168 X-SA-Exim-Mail-From: hugo@hugovil.com Subject: Re: [PATCH v6 5/9] serial: sc16is7xx: fix regression with GPIO configuration X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.hugovil.com) Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org On Fri, 2 Jun 2023 00:30:14 +0300 andy.shevchenko@gmail.com wrote: > Thu, Jun 01, 2023 at 04:18:40PM -0400, Hugo Villeneuve kirjoitti: > > From: Hugo Villeneuve > > > > Commit 679875d1d880 ("sc16is7xx: Separate GPIOs from modem control lines") > > and commit 21144bab4f11 ("sc16is7xx: Handle modem status lines") > > changed the function of the GPIOs pins to act as modem control > > lines without any possibility of selecting GPIO function. > > > > As a consequence, applications that depends on GPIO lines configured > > by default as GPIO pins no longer work as expected. > > > > Also, the change to select modem control lines function was done only > > for channel A of dual UART variants (752/762). This was not documented > > in the log message. > > > > Allow to specify GPIO or modem control line function in the device > > tree, and for each of the ports (A or B). > > > > Do so by using the new device-tree property named > > "modem-control-line-ports" (property added in separate patch). > > > > When registering GPIO chip controller, mask-out GPIO pins declared as > > modem control lines according to this new "modem-control-line-ports" > > DT property. > > > > Boards that need to have GPIOS configured as modem control lines > > should add that property to their device tree. Here is a list of > > boards using the sc16is7xx driver in their device tree and that may > > need to be modified: > > arm64/boot/dts/freescale/fsl-ls1012a-frdm.dts > > mips/boot/dts/ingenic/cu1830-neo.dts > > mips/boot/dts/ingenic/cu1000-neo.dts > > Almost good, a few remarks and if addressed as suggested, > Reviewed-by: Andy Shevchenko > > Thank you! > > ... > > > + if (!s->gpio_valid_mask) > > I would use == 0, but it's up to you. Both will work equally. Hi, done. > > + return 0; > > ... > > > +static int sc16is7xx_setup_mctrl_ports(struct device *dev) > > Not sure why int if you always return an unsigned value. > Otherwise return an error code when it's no defined mask > and check it in the caller. Changed return type to u8. > > +{ > > + struct sc16is7xx_port *s = dev_get_drvdata(dev); > > + int i; > > + int ret; > > + int count; > > + u32 mctrl_port[2]; > > + u8 mctrl_mask = 0; > > I would return 0 directly in the first two cases and split an assignment closer > to the first user. > > > + count = device_property_count_u32(dev, "nxp,modem-control-line-ports"); > > + if (count < 0 || count > ARRAY_SIZE(mctrl_port)) > > + return mctrl_mask; > > return 0; Done. > > + ret = device_property_read_u32_array(dev, "nxp,modem-control-line-ports", > > + mctrl_port, count); > > + if (ret) > > + return mctrl_mask; > > return 0; Done. > mctrl_mask = 0; Done. > > + for (i = 0; i < count; i++) { > > + /* Use GPIO lines as modem control lines */ > > + if (mctrl_port[i] == 0) > > + mctrl_mask |= SC16IS7XX_IOCONTROL_MODEM_A_BIT; > > + else if (mctrl_port[i] == 1) > > + mctrl_mask |= SC16IS7XX_IOCONTROL_MODEM_B_BIT; > > + } > > > + if (!mctrl_mask) > > + return mctrl_mask; > > Maybe positive one? > if (mctrl_mask) > regmap_update_bits(...); I used negative to save on indentation, but it also fits by converting it to positive, so done. > > + regmap_update_bits(s->regmap, > > + SC16IS7XX_IOCONTROL_REG << SC16IS7XX_REG_SHIFT, > > + SC16IS7XX_IOCONTROL_MODEM_A_BIT | > > + SC16IS7XX_IOCONTROL_MODEM_B_BIT, mctrl_mask); > > + > > + return mctrl_mask; > > +} > > ... > > > unsigned long freq = 0, *pfreq = dev_get_platdata(dev); > > unsigned int val; > > + u8 mctrl_mask = 0; > > This assignment is redundant, so you simply can define it > > > u32 uartclk = 0; > > u8 mctrl_mask; Done. I will send a V7 soon with your Reviewed-by tag. Thank you, Hugo. > > int i, ret; > > struct sc16is7xx_port *s; > > -- > With Best Regards, > Andy Shevchenko