From patchwork Mon Mar 8 06:35:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 12121587 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 60072C4332B for ; Mon, 8 Mar 2021 06:37:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E889651F8 for ; Mon, 8 Mar 2021 06:37:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233961AbhCHGgw (ORCPT ); Mon, 8 Mar 2021 01:36:52 -0500 Received: from fllv0015.ext.ti.com ([198.47.19.141]:55912 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234885AbhCHGgi (ORCPT ); Mon, 8 Mar 2021 01:36:38 -0500 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 1286aKYH110190; Mon, 8 Mar 2021 00:36:20 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1615185380; bh=RuH1XyFPlD2/xUnAbgo3c6Sl0V2SC3r4WGxGh2uZNc8=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=Yosq7WEROYMiwO5WYdQCKxSPFbB5wBZOqj5aFd8uqPawsoc38DdGULVdseFS45BSG Vvd4MrLkLcwK/QBHNDWnjdAFmgD8Fypi7iQnSA5K9EpECQzIwJW6nsMiWyuP1EyxCp r82XbC4hq/rjyPGcYW4QCVX2T556YyqzPhp+MinI= Received: from DLEE103.ent.ti.com (dlee103.ent.ti.com [157.170.170.33]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 1286aKZ7017883 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 8 Mar 2021 00:36:20 -0600 Received: from DLEE114.ent.ti.com (157.170.170.25) by DLEE103.ent.ti.com (157.170.170.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3; Mon, 8 Mar 2021 00:36:20 -0600 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE114.ent.ti.com (157.170.170.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1979.3 via Frontend Transport; Mon, 8 Mar 2021 00:36:20 -0600 Received: from a0393678-ssd.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id 1286ZuTW117458; Mon, 8 Mar 2021 00:36:16 -0600 From: Kishon Vijay Abraham I To: Kishon Vijay Abraham I , Bjorn Helgaas , Rob Herring , Tom Joseph , Lorenzo Pieralisi , Nadeem Athani CC: , , , , , Lokesh Vutla Subject: [PATCH v4 4/4] PCI: j721e: Add support to provide refclk to PCIe connector Date: Mon, 8 Mar 2021 12:05:50 +0530 Message-ID: <20210308063550.6227-5-kishon@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210308063550.6227-1-kishon@ti.com> References: <20210308063550.6227-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add support to provide refclk to PCIe connector. Signed-off-by: Kishon Vijay Abraham I --- drivers/pci/controller/cadence/pci-j721e.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index dac1ac8a7615..7f9dd34b98a9 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -6,6 +6,7 @@ * Author: Kishon Vijay Abraham I */ +#include #include #include #include @@ -50,6 +51,7 @@ enum link_status { struct j721e_pcie { struct device *dev; + struct clk *refclk; u32 mode; u32 num_lanes; struct cdns_pcie *cdns_pcie; @@ -310,6 +312,7 @@ static int j721e_pcie_probe(struct platform_device *pdev) struct cdns_pcie_ep *ep; struct gpio_desc *gpiod; void __iomem *base; + struct clk *clk; u32 num_lanes; u32 mode; int ret; @@ -408,6 +411,20 @@ static int j721e_pcie_probe(struct platform_device *pdev) goto err_get_sync; } + clk = devm_clk_get_optional(dev, "pcie_refclk"); + if (IS_ERR(clk)) { + ret = PTR_ERR(clk); + dev_err(dev, "failed to get pcie_refclk\n"); + goto err_pcie_setup; + } + + ret = clk_prepare_enable(clk); + if (ret) { + dev_err(dev, "failed to enable pcie_refclk\n"); + goto err_get_sync; + } + pcie->refclk = clk; + /* * "Power Sequencing and Reset Signal Timings" table in * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 3.0 @@ -422,8 +439,10 @@ static int j721e_pcie_probe(struct platform_device *pdev) } ret = cdns_pcie_host_setup(rc); - if (ret < 0) + if (ret < 0) { + clk_disable_unprepare(pcie->refclk); goto err_pcie_setup; + } break; case PCI_MODE_EP: @@ -476,6 +495,7 @@ static int j721e_pcie_remove(struct platform_device *pdev) struct cdns_pcie *cdns_pcie = pcie->cdns_pcie; struct device *dev = &pdev->dev; + clk_disable_unprepare(pcie->refclk); cdns_pcie_disable_phy(cdns_pcie); pm_runtime_put(dev); pm_runtime_disable(dev);