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_disabled that checks to see if a
node has the status property set to "disabled". This can be quite useful
for devices that may be present but disabled due to pin sharing, etc.
Signed-off-by: Josh Boyer <[EMAIL PROTECTED]>
---
drivers/of/base.c | 18 ++++++++++++++++++
include/linux/of.h | 1 +
2 files changed, 19 insertions(+)
--- linux-2.6.orig/drivers/of/base.c
+++ linux-2.6/drivers/of/base.c
@@ -117,6 +117,24 @@ int of_device_is_compatible(const struct
EXPORT_SYMBOL(of_device_is_compatible);
/**
+ * of_device_is_disabled - Check if a device's status is disabled
+ * @device: device node to check
+ *
+ * Returns true or false depending on the value of the staus property
+ */
+int of_device_is_disabled(const struct device_node *device)
+{
+ const char *status;
+
+ status = of_get_property(device, "status", NULL);
+ if (status == NULL)
+ return 0;
+
+ return !(strcmp(status, "disabled"));
+}
+EXPORT_SYMBOL(of_device_is_disabled);
+
+/**
* of_get_parent - Get a node's parent if any
* @node: Node to get parent
*
--- linux-2.6.orig/include/linux/of.h
+++ linux-2.6/include/linux/of.h
@@ -62,6 +62,7 @@ extern struct property *of_find_property
int *lenp);
extern int of_device_is_compatible(const struct device_node *device,
const char *);
+extern int of_device_is_disabled(const struct device_node *device);
extern const void *of_get_property(const struct device_node *node,
const char *name,
int *lenp);
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