From patchwork Mon Feb 8 13:55:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 378716 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 F1245C433E0 for ; Mon, 8 Feb 2021 13:59:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DCBC64E50 for ; Mon, 8 Feb 2021 13:59:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231991AbhBHN7G (ORCPT ); Mon, 8 Feb 2021 08:59:06 -0500 Received: from mail.baikalelectronics.com ([87.245.175.226]:57080 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231882AbhBHN5r (ORCPT ); Mon, 8 Feb 2021 08:57:47 -0500 From: Serge Semin To: Rob Herring , Giuseppe Cavallaro , Alexandre Torgue , Jose Abreu , "David S. Miller" , Jakub Kicinski , Johan Hovold , Maxime Ripard , Joao Pinto , Lars Persson , Maxime Coquelin CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , Vyacheslav Mitrofanov , , , , , Subject: [PATCH v2 14/24] net: stmmac: Use optional clock request method to get stmmaceth Date: Mon, 8 Feb 2021 16:55:58 +0300 Message-ID: <20210208135609.7685-15-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20210208135609.7685-1-Sergey.Semin@baikalelectronics.ru> References: <20210208135609.7685-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The "stmmaceth" clock is expected to be optional by the current driver design, but there are several problems in the implementation. First if the clock is specified, but failed to be requested due to an internal error or due to not being ready yet for configuration, then the DT-probe procedure will just proceed with further initializations. It is erroneous in both cases. Secondly if we'd use the clock API, which expect the clock being optional we wouldn't have needed to avoid the clock request procedure for the "snps,dwc-qos-ethernet-4.10"-compatible devices to prevent the error message from being printed. All of that can be fixed by using the devm_clk_get_optional() method here provided by the common clock framework. Signed-off-by: Serge Semin --- .../ethernet/stmicro/stmmac/stmmac_platform.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index ff66c470f07f..a66467baf30a 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c @@ -566,16 +566,17 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac) if (rc) goto error_dma_cfg_alloc; - /* clock setup */ - if (!of_device_is_compatible(np, "snps,dwc-qos-ethernet-4.10")) { - plat->stmmac_clk = devm_clk_get(&pdev->dev, - STMMAC_RESOURCE_NAME); - if (IS_ERR(plat->stmmac_clk)) { - dev_warn(&pdev->dev, "Cannot get CSR clock\n"); - plat->stmmac_clk = NULL; - } - clk_prepare_enable(plat->stmmac_clk); + /* All clocks are optional since the sub-drivers may use the platform + * clocks pointers to preserve their own clock-descriptors. + */ + plat->stmmac_clk = devm_clk_get_optional(&pdev->dev, + STMMAC_RESOURCE_NAME); + if (IS_ERR(plat->stmmac_clk)) { + rc = PTR_ERR(plat->stmmac_clk); + dev_err_probe(&pdev->dev, rc, "Cannot get CSR clock\n"); + goto error_dma_cfg_alloc; } + clk_prepare_enable(plat->stmmac_clk); plat->pclk = devm_clk_get_optional(&pdev->dev, "pclk"); if (IS_ERR(plat->pclk)) {