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From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH v3 12/17] PCI: imx6: Allow probe deferral by reset GPIO
Date: Tue, 15 Jan 2019 12:25:56 -0800	[thread overview]
Message-ID: <20190115202601.24831-13-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190115202601.24831-1-andrew.smirnov@gmail.com>

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 <andrew.smirnov@gmail.com>
  Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
  Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
  Cc: yurovsky@gmail.com
  Cc: Fabio Estevam <fabio.estevam@nxp.com>
  Cc: Dong Aisheng <dongas86@gmail.com>
  Cc: linux-arm-kernel@lists.infradead.org

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/pci/pci-imx6.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/pci-imx6.c b/drivers/pci/pci-imx6.c
index 6471f95b62..ce68b007ab 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;
@@ -599,13 +599,11 @@ static int __init imx6_pcie_probe(struct device_d *dev)
 	imx6_pcie->variant =
 		(enum imx6_pcie_variants)of_device_get_match_data(dev);
 
-	iores = dev_request_mem_resource(dev, 0);
-	if (IS_ERR(iores))
-		return PTR_ERR(iores);
-	pci->dbi_base = IOMEM(iores->start);
-
 	/* 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");
@@ -615,6 +613,11 @@ static int __init imx6_pcie_probe(struct device_d *dev)
 		}
 	}
 
+	iores = dev_request_mem_resource(dev, 0);
+	if (IS_ERR(iores))
+		return PTR_ERR(iores);
+	pci->dbi_base = IOMEM(iores->start);
+
 	/* Fetch clocks */
 	imx6_pcie->pcie_phy = clk_get(dev, "pcie_phy");
 	if (IS_ERR(imx6_pcie->pcie_phy)) {
-- 
2.20.1


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  parent reply	other threads:[~2019-01-15 20:26 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-15 20:25 [PATCH v3 00/17] PCIe support for i.MX7 Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 01/17] regulator: Convert drivers to use struct regulator_desc Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 02/17] regulator: Port basic regmap regulator functions Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 03/17] regulator: Add support for setting regulator's voltage Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 04/17] base: driver: Drop redundant list_empty() check Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 05/17] regulator: Assume probe deferral instead of missing regulator Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 06/17] regulator: Port ANATOP driver from Linux Andrey Smirnov
2019-01-16  2:10   ` Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 07/17] drivers: base: Port power management code " Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 08/17] soc: imx: Add GPCv2 power gating driver Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 09/17] reset: Add i.MX7 SRC reset driver Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 10/17] reset: Mark local functions as static Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 11/17] PCI: imx6: Add code to support i.MX7D Andrey Smirnov
2019-01-15 20:25 ` Andrey Smirnov [this message]
2019-01-15 20:25 ` [PATCH v3 13/17] PCI: imx6: Do not wait for speed change on i.MX7 Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 14/17] PCI: imx6: Do not switch speed if Gen2 is disabled Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 15/17] PCI: imx6: Fix spelling mistake: "contol" -> "control" Andrey Smirnov
2019-01-15 20:26 ` [PATCH v3 16/17] PCI: imx6: Drop unnecessary root_bus_nr setting Andrey Smirnov
2019-01-15 20:26 ` [PATCH v3 17/17] PCI: imx6: Port imx6_pcie_ltssm_enable() Andrey Smirnov

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