From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753703AbdASQiE (ORCPT ); Thu, 19 Jan 2017 11:38:04 -0500 Received: from mail-pf0-f195.google.com ([209.85.192.195]:36629 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753402AbdASQhp (ORCPT ); Thu, 19 Jan 2017 11:37:45 -0500 From: Andrey Smirnov To: linux-pci@vger.kernel.org Cc: Andrey Smirnov , yurovsky@gmail.com, Richard Zhu , Lucas Stach , Bjorn Helgaas , Fabio Estevam , Shawn Guo , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] PCI: imx6: Allow probe deferal by reset GPIO Date: Thu, 19 Jan 2017 08:36:30 -0800 Message-Id: <20170119163631.10668-3-andrew.smirnov@gmail.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170119163631.10668-1-andrew.smirnov@gmail.com> References: <20170119163631.10668-1-andrew.smirnov@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some designs implement reset GPIO via a GPIO expander connected to a peripheral bus. One such example would be i.MX7 Sabre board where said GPIO is provided by SPI shift register connected to a bitbanged SPI bus. In order to support such designs allow reset GPIO request to defer probing of the driver. Cc: yurovsky@gmail.com Cc: Richard Zhu Cc: Lucas Stach Cc: Bjorn Helgaas Cc: Fabio Estevam Cc: Shawn Guo Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Andrey Smirnov --- drivers/pci/host/pci-imx6.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c index 50a1291..574f026 100644 --- a/drivers/pci/host/pci-imx6.c +++ b/drivers/pci/host/pci-imx6.c @@ -653,6 +653,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev) dev_err(dev, "unable to get reset gpio\n"); return ret; } + } else if (imx6_pcie->reset_gpio == -EPROBE_DEFER) { + dev_info(dev, "probe is defered by reset GPIO\n"); + return imx6_pcie->reset_gpio; } /* Fetch clocks */ @@ -746,11 +749,12 @@ static struct platform_driver imx6_pcie_driver = { .name = "imx6q-pcie", .of_match_table = imx6_pcie_of_match, }, + .probe = imx6_pcie_probe, .shutdown = imx6_pcie_shutdown, }; static int __init imx6_pcie_init(void) { - return platform_driver_probe(&imx6_pcie_driver, imx6_pcie_probe); + return platform_driver_register(&imx6_pcie_driver); } device_initcall(imx6_pcie_init); -- 2.9.3