[PATCH v4 20/36] media: imx: Add CSI subdev driver
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From: linux@armlinux.org.uk (Russell King - ARM Linux)
Date: 2017-02-16 11:53:01
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linux-devicetree, linux-media, lkml
On Wed, Feb 15, 2017 at 06:19:22PM -0800, Steve Longerbeam wrote:
quoted hunk ↗ jump to hunk
+static const struct platform_device_id imx_csi_ids[] = { + { .name = "imx-ipuv3-csi" }, + { }, +}; +MODULE_DEVICE_TABLE(platform, imx_csi_ids); + +static struct platform_driver imx_csi_driver = { + .probe = imx_csi_probe, + .remove = imx_csi_remove, + .id_table = imx_csi_ids, + .driver = { + .name = "imx-ipuv3-csi", + }, +}; +module_platform_driver(imx_csi_driver); + +MODULE_DESCRIPTION("i.MX CSI subdev driver"); +MODULE_AUTHOR("Steve Longerbeam <steve_longerbeam@mentor.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:imx-ipuv3-csi");
Just a reminder that automatic module loading of this is completely
broken right now (not your problem) due to this stupid idea in the
IPUv3 code:
if (!ret)
ret = platform_device_add(pdev);
if (ret) {
platform_device_put(pdev);
goto err_register;
}
/*
* Set of_node only after calling platform_device_add. Otherwise
* the platform:imx-ipuv3-crtc modalias won't be used.
*/
pdev->dev.of_node = of_node;
setting pdev->dev.of_node changes the modalias exported to userspace,
so udev sees a DT based modalias, which causes it to totally miss any
driver using a non-DT based modalias.
The IPUv3 code needs fixing, not only for imx-media-csi, but also for
imx-ipuv3-crtc too, because that module will also suffer the same
issue.
The only solution is... don't fsck with dev->of_node assignment. In
this case, it's probably much better to pass it in via platform data.
If you then absolutely must have dev->of_node, doing it in the driver
means that you avoid the modalias mess before the appropriate driver
is loaded. However, that's still not a nice solution because the
modalias file still ends up randomly changing its contents.
As I say, not _your_ problem, but it's still a problem that needs
solving, and I don't want it forgotten about.
--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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