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=-5.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, 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 A60EEC4CEC9 for ; Wed, 18 Sep 2019 06:35:53 +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 76C4B2067B for ; Wed, 18 Sep 2019 06:35:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="N2/RjoEh" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76C4B2067B Authentication-Results: mail.kernel.org; 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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iATYy-0001Lk-Ac; Wed, 18 Sep 2019 06:35:40 +0000 Received: from mail-sz.amlogic.com ([211.162.65.117]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iATYr-0001JG-8f; Wed, 18 Sep 2019 06:35:35 +0000 Received: from [10.28.18.45] (10.28.18.45) by mail-sz.amlogic.com (10.28.11.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1591.10; Wed, 18 Sep 2019 14:36:22 +0800 Subject: Re: [PATCH 2/3] pinctrl: meson-a1: add pinctrl driver for Meson A1 Soc To: Jerome Brunet References: <1568700442-18540-1-git-send-email-qianggui.song@amlogic.com> <1568700442-18540-3-git-send-email-qianggui.song@amlogic.com> <1jef0f46fj.fsf@starbuckisacylon.baylibre.com> <73dc56bd-d6c5-1de7-e97e-91479a89a29e@amlogic.com> <1j8sqn3tjt.fsf@starbuckisacylon.baylibre.com> From: Qianggui Song Message-ID: <45b97927-c771-808a-b214-509af6c16931@amlogic.com> Date: Wed, 18 Sep 2019 14:36:22 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <1j8sqn3tjt.fsf@starbuckisacylon.baylibre.com> Content-Language: en-US X-Originating-IP: [10.28.18.45] X-ClientProxiedBy: mail-sz.amlogic.com (10.28.11.5) To mail-sz.amlogic.com (10.28.11.5) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190917_233533_311252_D7C57253 X-CRM114-Status: GOOD ( 14.48 ) 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: Mark Rutland , Hanjie Lin , Jianxin Pan , Neil Armstrong , Martin Blumenstingl , Kevin Hilman , Linus Walleij , linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, Rob Herring , linux-arm-kernel@lists.infradead.org, Carlo Caione , linux-amlogic@lists.infradead.org, Xingyu Chen 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 2019/9/17 22:07, Jerome Brunet wrote: > > On Tue 17 Sep 2019 at 13:51, Qianggui Song wrote: >>>> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c >>>> index 8bba9d0..885b89d 100644 >>>> --- a/drivers/pinctrl/meson/pinctrl-meson.c >>>> +++ b/drivers/pinctrl/meson/pinctrl-meson.c >>>> @@ -688,8 +688,12 @@ static int meson_pinctrl_parse_dt(struct meson_pinctrl *pc, >>>> >>>> pc->reg_ds = meson_map_resource(pc, gpio_np, "ds"); >>>> if (IS_ERR(pc->reg_ds)) { >>>> - dev_dbg(pc->dev, "ds registers not found - skipping\n"); >>>> - pc->reg_ds = NULL; >>>> + if (pc->data->reg_layout == A1_LAYOUT) { >>>> + pc->reg_ds = pc->reg_pullen; >>> >>> IMO, this kind of ID based init fixup is not going to scale and will >>> lead to something difficult to maintain in the end. >>> >>> The way the different register sets interract with each other is already >>> pretty complex to follow. >>> >>> You could rework this in 2 different ways: >>> #1 - Have the generic function parse all the register sets and have all >>> drivers provide a specific (as in gxbb, gxl, axg, etc ...) function to : >>> - Verify the expected sets have been provided >>> - Make assignement fixup as above if necessary >>> >>> #2 - Rework the driver to have only one single register region >>> I think one of your colleague previously mentionned this was not >>> possible. It is still unclear to me why ... >>> >> Appreciate your advice. I have an idea based on #1, how about providing >> only two dt parse function, one is for chips before A1(the old one), >> another is for A1 and later chips that share the same layout. Assign >> these two functions to their own driver. > > That's roughly the same thing as your initial proposition with function > pointer instead of IDs ... IMO, this would still be a quick fix to > address your immediate topic instead of dealing with the driver as > whole, which is my concern here. > For #1. It would be like generic_parse_dt() { 1. parse all register regions (mux gpio pull pull_en ds) 2. call specific function through function pointer in meson_pinctrl_data.(each platform should have AO and EE two specific functions for they are not the same) { do work you mentioned above } } right ? If that so, maybe there are a lot of duplicated codes for most Socs share the same reg layout. So I guess five specific functions are enough: AXG and before(ao,ee), G12A(ao,ee) and A1(will place them in pinctrl_meson.c). Since m8 to AXG are the same register layout for both ee and ao, G12A with new feature ds and new ao register layout. Or I misunderstood the #1 ? >>>> + } else { >>>> + dev_dbg(pc->dev, "ds registers not found - skipping\n"); >>>> + pc->reg_ds = NULL; >>>> + } >>>> } >>>> >>>> return 0; >>>> diff --git a/drivers/pinctrl/meson/pinctrl-meson.h b/drivers/pinctrl/meson/pinctrl-meson.h >>>> index c696f32..3d0c58d 100644 >>>> --- a/drivers/pinctrl/meson/pinctrl-meson.h >>>> +++ b/drivers/pinctrl/meson/pinctrl-meson.h >>>> @@ -80,6 +80,14 @@ enum meson_pinconf_drv { >>>> }; >>>> >>>> /** >>>> + * enum meson_reg_layout - identify two types of reg layout >>>> + */ >>>> +enum meson_reg_layout { >>>> + LEGACY_LAYOUT, >>>> + A1_LAYOUT, >>>> +}; >>>> + >>>> +/** >>>> * struct meson bank >>>> * >>>> * @name: bank name >>>> @@ -114,6 +122,7 @@ struct meson_pinctrl_data { >>>> unsigned int num_banks; >>>> const struct pinmux_ops *pmx_ops; >>>> void *pmx_data; >>>> + unsigned int reg_layout; >>>> }; >>>> >>>> struct meson_pinctrl { >>> >>> . >>> > > . > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel