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[81.5.99.6]) by smtp.googlemail.com with ESMTPSA id s7sm1407317lfi.140.2021.03.08.05.51.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Mar 2021 05:51:15 -0800 (PST) Subject: Re: [PATCH 1/2] net: allwinner: reset control support To: Maxime Ripard Cc: Chen-Yu Tsai , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring References: <20210307031353.12643-1-boger@wirenboard.com> <20210307031353.12643-2-boger@wirenboard.com> <20210308133617.xqbjv7jybxbbqa27@gilmour> From: Evgeny Boger Message-ID: Date: Mon, 8 Mar 2021 16:51:14 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210308133617.xqbjv7jybxbbqa27@gilmour> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, thank you for your review! 3/8/21 4:36 PM, Maxime Ripard пишет: > Hi, > > On Sun, Mar 07, 2021 at 06:13:51AM +0300, Evgeny Boger wrote: >> R40 (aka V40/A40i/T3) and A10/A20 share the same EMAC IP. >> However, on R40 the EMAC is gated by default. >> >> Signed-off-by: Evgeny Boger > On which device was it tested? It's custom-made Allwinner A40i device with two IP101GRI PHYs in MII mode. >> --- >> drivers/net/ethernet/allwinner/sun4i-emac.c | 21 ++++++++++++++++++++- >> 1 file changed, 20 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c >> index 5ed80d9a6b9f..c0ae06dd922c 100644 >> --- a/drivers/net/ethernet/allwinner/sun4i-emac.c >> +++ b/drivers/net/ethernet/allwinner/sun4i-emac.c >> @@ -28,6 +28,7 @@ >> #include >> #include >> #include >> +#include >> #include >> >> #include "sun4i-emac.h" >> @@ -85,6 +86,7 @@ struct emac_board_info { >> unsigned int link; >> unsigned int speed; >> unsigned int duplex; >> + struct reset_control *reset; > You should align this with the rest of the other fields > >> >> phy_interface_t phy_interface; >> }; >> @@ -791,6 +793,7 @@ static int emac_probe(struct platform_device *pdev) >> struct net_device *ndev; >> int ret = 0; >> const char *mac_addr; >> + struct reset_control *reset; >> >> ndev = alloc_etherdev(sizeof(struct emac_board_info)); >> if (!ndev) { >> @@ -852,6 +855,19 @@ static int emac_probe(struct platform_device *pdev) >> goto out_release_sram; >> } >> >> + reset = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); >> + if (IS_ERR(reset)) { >> + dev_err(&pdev->dev, "unable to request reset\n"); >> + ret = -ENODEV; >> + goto out_release_sram; >> + } > Judging from your commit log, it's not really optional for the R40. The > way we usually deal with this is to have a structure associated with a > new compatible and have a flag tell if that compatible requires a reset > line or not. > > The dt binding should also be amended to allow the reset property > got it >> + db->reset = reset; >> + ret = reset_control_deassert(db->reset); >> + if (ret) { >> + dev_err(&pdev->dev, "could not deassert EMAC reset\n"); >> + goto out_release_sram; >> + } >> + > The programming guidelines in the datasheet ask that the reset line must > be deasserted before the clock in enabled. right, found it at section 3.3.2.6, thanks > > Maxime 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=-15.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 AD055C433E0 for ; Mon, 8 Mar 2021 13:56:38 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 2D93965100 for ; Mon, 8 Mar 2021 13:56:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2D93965100 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=wirenboard.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+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=desiato.20200630; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:Cc:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=xgWp5GOqwZUuPOirNYbkl93CAmQYPws3wHgLkZy05eA=; b=GYxyt9MHznOb6ZcW0Sv6hjqS9 2aUGOQSb7ChvSgy+CO+o7K2rG9go41FnszZnJIZFcSlezbvPT72lZiJI3B/0nvJj87Ponl/ndnz4e uje40xb9e6CMh3PoAFw6vcDzkw43oxfPwz8kiAnuR5vQP7qwVAUPXXEXGrqYTkfOfqaG/5U9F6QgF XoGmPk2VY1s88cXP8NMWmniHU6BxUjK+EHEHtNVCkY8bYgLgeYV6U2saGHyHmUd4ppb8PIYhXoDGy FfK9JjztEx0+9JJz2CjzLKWjveu0DX+uX8MZMwkGb6WK1e62+AGgyhZ90014DLcbp1SFBd4RqsYG2 +JVGYoClQ==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lJGLV-0001BP-Sv; Mon, 08 Mar 2021 13:54:54 +0000 Received: from mail-lf1-x130.google.com ([2a00:1450:4864:20::130]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lJGI2-00HaDC-8j for linux-arm-kernel@lists.infradead.org; Mon, 08 Mar 2021 13:51:24 +0000 Received: by mail-lf1-x130.google.com with SMTP id 18so21066996lff.6 for ; Mon, 08 Mar 2021 05:51:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wirenboard-com.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding:content-language; bh=fEBYHOeJmoDLedRNLK+730twQNE9o6QKDts6T+ggwUw=; b=U7Ld9nLPBKwukUC77T14sY8bn8YJmrYJkDuAxzufzP1MWYAPo/qFOJRWmwFoKUh6pj 02f7CdaTuiCEwmqmK3Cdh4NGu77Ea1DkAvl/+9Jzr6YLGwZaS1CtwQyY+5CECTFsLiC3 DAINuJKS+utvShMiBvpnQqYLAtwotk+E5ZnCs9Lh5iNieWsrmbT/Y5mw3wUqAVexZAjX KhhVyavppversuKgdIfBGQSz6ujqEmAHU5rOawfrGO9yQ5NSyJClKyF2n8LYl8Tqef/7 g/bIUgSSXSpKVOA3mLSnrPMjR0AdzalodY9MfR4NqcTUd2WsrE5IzZTlhFDtVxXLpmgy W3ng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding :content-language; bh=fEBYHOeJmoDLedRNLK+730twQNE9o6QKDts6T+ggwUw=; b=YeDDrnyham63C4gqjfX18Wz0TKZf/kRDssn63DTFy/jeNMVr9L9faQFjAnSYBDnxAB aKqqM+w2TsgoFRdRlVazZn8kUmvHxzNbjsUIvdD4qXci6cToWx2u7tHgkOtG649lhJp+ ZO3Y60UwnIERSprt0J0sk8mYCGBAmwRcVo0xSYuLUhs7LOJuru3JmM0qHkxlBiQTZQOK qzXCKgw6OOMIZLuZY08vLFVHpi4AupA1AP7S+vsO5X+Ifk9kNt+ngBEcKyRh0aaeF6Yg 5lNw9ejlPEHE0FG7eEuoY8mW50LLuTP5ygmQ56Ge35BQrr+SFXcADWvH6eF1JQ63Lh16 0u2A== X-Gm-Message-State: AOAM531SMdkaFh5tkj/KMR3xvkfE6gweQ9IAxeGjyMvvGoJ2Evza6bxt jXJCPm+gb3FDiJtCLFHgbKbwhQ== X-Google-Smtp-Source: ABdhPJy/hOdrWSRUbyZnMofoPUYrs3dZ2/pz7ECHvekYUG3v0TEAjrR46Nkp3/aqnXEODSQHPCkgCw== X-Received: by 2002:ac2:482b:: with SMTP id 11mr13949371lft.642.1615211475673; Mon, 08 Mar 2021 05:51:15 -0800 (PST) Received: from [192.168.1.213] (81.5.99.6.dhcp.mipt-telecom.ru. [81.5.99.6]) by smtp.googlemail.com with ESMTPSA id s7sm1407317lfi.140.2021.03.08.05.51.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Mar 2021 05:51:15 -0800 (PST) Subject: Re: [PATCH 1/2] net: allwinner: reset control support To: Maxime Ripard Cc: Chen-Yu Tsai , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Rob Herring References: <20210307031353.12643-1-boger@wirenboard.com> <20210307031353.12643-2-boger@wirenboard.com> <20210308133617.xqbjv7jybxbbqa27@gilmour> From: Evgeny Boger Message-ID: Date: Mon, 8 Mar 2021 16:51:14 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210308133617.xqbjv7jybxbbqa27@gilmour> Content-Language: en-GB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210308_135118_914551_B8FDC4D9 X-CRM114-Status: GOOD ( 27.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; 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