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authorStephen Boyd <stephen.boyd@linaro.org>2016-12-29 01:56:47 +0300
committerPeter Chen <peter.chen@nxp.com>2017-01-20 06:23:51 +0300
commit9c829c097f2f1cbebcfff69a7254b1df9852fe4e (patch)
tree0c2329e62da791c3488f07b42df3f4a41f24a984 /drivers/of
parent3f991aa0b665c8e9bb702421a4e5005c3588fb62 (diff)
downloadlinux-9c829c097f2f1cbebcfff69a7254b1df9852fe4e.tar.xz
of: device: Support loading a module with OF based modalias
In the case of ULPI devices, we want to be able to load the driver before registering the device so that we don't get stuck in a loop waiting for the phy module to appear and failing usb controller probe. Currently we request the ulpi module via the ulpi ids, but in the DT case we might need to request it with the OF based modalias instead. Add a common function that allows anyone to request a module with the OF based modalias. Acked-by: Rob Herring <robh@kernel.org> Cc: <devicetree@vger.kernel.org> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Signed-off-by: Peter Chen <peter.chen@nxp.com>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/device.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c
index fd5cfad7c403..8a22a253a830 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -226,6 +226,29 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
return tsize;
}
+int of_device_request_module(struct device *dev)
+{
+ char *str;
+ ssize_t size;
+ int ret;
+
+ size = of_device_get_modalias(dev, NULL, 0);
+ if (size < 0)
+ return size;
+
+ str = kmalloc(size + 1, GFP_KERNEL);
+ if (!str)
+ return -ENOMEM;
+
+ of_device_get_modalias(dev, str, size);
+ str[size] = '\0';
+ ret = request_module(str);
+ kfree(str);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(of_device_request_module);
+
/**
* of_device_uevent - Display OF related uevent information
*/