From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: linux-pci@vger.kernel.org
Cc: Richard Zhu <hongxing.zhu@nxp.com>,
Andrey Smirnov <andrew.smirnov@gmail.com>,
Shawn Guo <shawnguo@kernel.org>,
linux-kernel@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
yurovsky@gmail.com, Fabio Estevam <festevam@gmail.com>,
linux-arm-kernel@lists.infradead.org,
Lucas Stach <l.stach@pengutronix.de>
Subject: [PATCH 2/3] PCI: imx6: Allow probe deferal by reset GPIO
Date: Thu, 19 Jan 2017 08:36:30 -0800 [thread overview]
Message-ID: <20170119163631.10668-3-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20170119163631.10668-1-andrew.smirnov@gmail.com>
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 <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
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
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2017-01-19 16:36 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-19 16:36 [PATCH 0/3] i.MX7 PCI support Andrey Smirnov
2017-01-19 16:36 ` [PATCH 1/3] PCI: imx6: Fix a typo in error message Andrey Smirnov
2017-01-19 16:41 ` Lucas Stach
2017-01-19 16:36 ` Andrey Smirnov [this message]
2017-01-19 16:44 ` [PATCH 2/3] PCI: imx6: Allow probe deferal by reset GPIO Lucas Stach
2017-01-20 23:21 ` kbuild test robot
2017-01-19 16:36 ` [PATCH 3/3] PCI: imx6: Add code to support i.MX7D Andrey Smirnov
2017-01-19 16:52 ` Lucas Stach
2017-01-20 14:24 ` Andrey Smirnov
2017-01-23 14:52 ` Rob Herring
2017-01-23 15:02 ` Andrey Smirnov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20170119163631.10668-3-andrew.smirnov@gmail.com \
--to=andrew.smirnov@gmail.com \
--cc=bhelgaas@google.com \
--cc=festevam@gmail.com \
--cc=hongxing.zhu@nxp.com \
--cc=l.stach@pengutronix.de \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=shawnguo@kernel.org \
--cc=yurovsky@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).