From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pf1-x442.google.com ([2607:f8b0:4864:20::442]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gh82k-00045u-RN for barebox@lists.infradead.org; Wed, 09 Jan 2019 07:13:11 +0000 Received: by mail-pf1-x442.google.com with SMTP id r136so3222356pfc.6 for ; Tue, 08 Jan 2019 23:12:50 -0800 (PST) From: Andrey Smirnov Date: Tue, 8 Jan 2019 23:12:05 -0800 Message-Id: <20190109071210.18896-17-andrew.smirnov@gmail.com> In-Reply-To: <20190109071210.18896-1-andrew.smirnov@gmail.com> References: <20190109071210.18896-1-andrew.smirnov@gmail.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 16/21] PCI: imx6: Allow probe deferral by reset GPIO To: barebox@lists.infradead.org Cc: Andrey Smirnov Port of a Linux commit bde4a5a00e761f55be92f62378cf5024ced79ee3 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. To support such designs, allow reset GPIO request to defer probing of the driver. Signed-off-by: Andrey Smirnov Signed-off-by: Bjorn Helgaas Reviewed-by: Lucas Stach Cc: yurovsky@gmail.com Cc: Fabio Estevam Cc: Dong Aisheng Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Andrey Smirnov --- drivers/pci/pci-imx6.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/pci/pci-imx6.c b/drivers/pci/pci-imx6.c index 6471f95b6..517c6bef8 100644 --- a/drivers/pci/pci-imx6.c +++ b/drivers/pci/pci-imx6.c @@ -562,8 +562,8 @@ static const struct dw_pcie_host_ops imx6_pcie_host_ops = { .host_init = imx6_pcie_host_init, }; -static int __init imx6_add_pcie_port(struct imx6_pcie *imx6_pcie, - struct device_d *dev) +static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie, + struct device_d *dev) { struct dw_pcie *pci = imx6_pcie->pci; struct pcie_port *pp = &pci->pp; @@ -581,7 +581,7 @@ static int __init imx6_add_pcie_port(struct imx6_pcie *imx6_pcie, return 0; } -static int __init imx6_pcie_probe(struct device_d *dev) +static int imx6_pcie_probe(struct device_d *dev) { struct resource *iores; struct dw_pcie *pci; @@ -606,6 +606,9 @@ static int __init imx6_pcie_probe(struct device_d *dev) /* Fetch GPIOs */ imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0); + if (imx6_pcie->reset_gpio == -EPROBE_DEFER) + return imx6_pcie->reset_gpio; + if (gpio_is_valid(imx6_pcie->reset_gpio)) { ret = gpio_request_one(imx6_pcie->reset_gpio, GPIOF_OUT_INIT_LOW, "PCIe reset"); -- 2.20.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox