From patchwork Fri Nov 27 10:01:39 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Petr_=C5=A0tetiar?= X-Patchwork-Id: 7712311 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 4A9EDBF90C for ; Fri, 27 Nov 2015 10:04:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 62A66205E7 for ; Fri, 27 Nov 2015 10:04:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7C9AA205E6 for ; Fri, 27 Nov 2015 10:04:45 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a2FrA-00011Z-9w; Fri, 27 Nov 2015 10:02:20 +0000 Received: from ibawizard.net ([82.208.49.253] helo=mengele.ibawizard.net) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1a2Fr5-0000yL-US for linux-arm-kernel@lists.infradead.org; Fri, 27 Nov 2015 10:02:17 +0000 Received: from localhost.localdomain (localhost [127.0.0.1]) by mengele.ibawizard.net (Postfix) with ESMTP id 5A1D61D3600C; Fri, 27 Nov 2015 11:01:49 +0100 (CET) From: =?UTF-8?q?Petr=20=C5=A0tetiar?= To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2] PCI: imx6: Fix reset-gpio to work with active low GPIO Date: Fri, 27 Nov 2015 11:01:39 +0100 Message-Id: <1448618499-14990-1-git-send-email-ynezz@true.cz> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1448373334.3689.33.camel@pengutronix.de> References: <1448373334.3689.33.camel@pengutronix.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151127_020216_265187_57396663 X-CRM114-Status: GOOD ( 12.53 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bjorn Helgaas , linux-pci@vger.kernel.org, =?UTF-8?q?Petr=20=C5=A0tetiar?= , Richard Zhu , Lucas Stach Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP It's currently not possible to use reset-gpio on board where the GPIO is active low as the code incorrectly assumes, that reset-gpio will be always active high. In my case the broken behavior was observed on Toradex Apalis SoM with Ixora base board. Signed-off-by: Petr Štetiar --- Changes since v1: * reworked to use descriptor based GPIO interface drivers/pci/host/pci-imx6.c | 20 ++++++-------------- 1 file changed, 6 insertions(+), 14 deletions(-) diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 22e8224..c0e121d 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -32,7 +32,7 @@ #define to_imx6_pcie(x) container_of(x, struct imx6_pcie, pp) struct imx6_pcie { - int reset_gpio; + struct gpio_desc *reset_gpio; struct clk *pcie_bus; struct clk *pcie_phy; struct clk *pcie; @@ -287,10 +287,10 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp) usleep_range(200, 500); /* Some boards don't have PCIe reset GPIO. */ - if (gpio_is_valid(imx6_pcie->reset_gpio)) { - gpio_set_value(imx6_pcie->reset_gpio, 0); + if (imx6_pcie->reset_gpio) { + gpiod_set_value(imx6_pcie->reset_gpio, 0); msleep(100); - gpio_set_value(imx6_pcie->reset_gpio, 1); + gpiod_set_value(imx6_pcie->reset_gpio, 1); } return 0; @@ -560,7 +560,6 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) { struct imx6_pcie *imx6_pcie; struct pcie_port *pp; - struct device_node *np = pdev->dev.of_node; struct resource *dbi_base; int ret; @@ -581,15 +580,8 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) return PTR_ERR(pp->dbi_base); /* Fetch GPIOs */ - imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); - if (gpio_is_valid(imx6_pcie->reset_gpio)) { - ret = devm_gpio_request_one(&pdev->dev, imx6_pcie->reset_gpio, - GPIOF_OUT_INIT_LOW, "PCIe reset"); - if (ret) { - dev_err(&pdev->dev, "unable to get reset gpio\n"); - return ret; - } - } + imx6_pcie->reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset", + GPIOD_OUT_LOW); /* Fetch clocks */ imx6_pcie->pcie_phy = devm_clk_get(&pdev->dev, "pcie_phy");