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[73.19.0.61]) by smtp.gmail.com with ESMTPSA id s65sm10130051pgb.25.2017.01.19.08.36.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 19 Jan 2017 08:36:46 -0800 (PST) From: Andrey Smirnov To: linux-pci@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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170119_083807_577398_C618C964 X-CRM114-Status: GOOD ( 12.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Zhu , Andrey Smirnov , Shawn Guo , linux-kernel@vger.kernel.org, Bjorn Helgaas , yurovsky@gmail.com, Fabio Estevam , linux-arm-kernel@lists.infradead.org, Lucas Stach MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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);