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Commit 834d97d4 authored by Josh Boyer's avatar Josh Boyer Committed by Paul Mackerras
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[POWERPC] Add of_device_is_available function 



IEEE 1275 defined a standard "status" property to indicate the operational
status of a device.  The property has four possible values: okay, disabled,
fail, fail-xxx.  The absence of this property means the operational status
of the device is unknown or okay.

This adds a function called of_device_is_available that checks the state
of the status property of a device.  If the property is absent or set to
either "okay" or "ok", it returns 1.  Otherwise it returns 0.

Signed-off-by: default avatarJosh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 6ccf61f9

drivers/of/base.c

+26 −0
Original line number Diff line number Diff line
@@ -116,6 +116,32 @@ int of_device_is_compatible(const struct device_node *device, 
}

EXPORT_SYMBOL(of_device_is_compatible);



/**

 *  of_device_is_available - check if a device is available for use

 *

 *  @device: Node to check for availability

 *

 *  Returns 1 if the status property is absent or set to "okay" or "ok",

 *  0 otherwise

 */

int of_device_is_available(const struct device_node *device)

{

	const char *status;

	int statlen;



	status = of_get_property(device, "status", &statlen);

	if (status == NULL)

		return 1;



	if (statlen > 0) {

		if (!strcmp(status, "okay") || !strcmp(status, "ok"))

			return 1;

	}



	return 0;

}

EXPORT_SYMBOL(of_device_is_available);



/**

 *	of_get_parent - Get a node's parent if any

 *	@node:	Node to get parent

include/linux/of.h

+1 −0
Original line number Diff line number Diff line
@@ -62,6 +62,7 @@ extern struct property *of_find_property(const struct device_node *np, 
					 int *lenp);

extern int of_device_is_compatible(const struct device_node *device,

				   const char *);

extern int of_device_is_available(const struct device_node *device);

extern const void *of_get_property(const struct device_node *node,

				const char *name,

				int *lenp);