Commit 9c829c09 authored by Stephen Boyd's avatar Stephen Boyd Committed by Peter Chen
Browse files

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: default avatarRob Herring <robh@kernel.org>
Cc: <devicetree@vger.kernel.org>
Signed-off-by: default avatarStephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: default avatarPeter Chen <peter.chen@nxp.com>
parent 3f991aa0

drivers/of/device.c

+23 −0
Original line number Diff line number Diff line
@@ -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

 */

include/linux/of_device.h

+6 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ extern const void *of_device_get_match_data(const struct device *dev); 


extern ssize_t of_device_get_modalias(struct device *dev,

					char *str, ssize_t len);

extern int of_device_request_module(struct device *dev);



extern void of_device_uevent(struct device *dev, struct kobj_uevent_env *env);

extern int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env);
@@ -78,6 +79,11 @@ static inline int of_device_get_modalias(struct device *dev, 
	return -ENODEV;

}



static inline int of_device_request_module(struct device *dev)

{

	return -ENODEV;

}



static inline int of_device_uevent_modalias(struct device *dev,

				   struct kobj_uevent_env *env)

{

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