In some cases we want to check that a device is not only unavailable,
but specifically marked as "fail".
This will be used in a following change in the hardware prober driver.
Signed-off-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
---
drivers/of/base.c | 20 ++++++++++++++++++++
include/linux/of.h | 6 ++++++
2 files changed, 26 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 8d93cb6ea9cd..2726e5dce1bf 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -486,6 +486,26 @@ static bool __of_device_is_fail(const struct device_node *device)
return !strcmp(status, "fail") || !strncmp(status, "fail-", 5);
}
+/**
+ * of_device_is_fail - check if a device has status "fail" or "fail-..."
+ *
+ * @device: Node to check status for
+ *
+ * Return: True if the status property is set to "fail" or "fail-..." (for any
+ * error code suffix), false otherwise
+ */
+bool of_device_is_fail(const struct device_node *device)
+{
+ unsigned long flags;
+ bool res;
+
+ raw_spin_lock_irqsave(&devtree_lock, flags);
+ res = __of_device_is_fail(device);
+ raw_spin_unlock_irqrestore(&devtree_lock, flags);
+ return res;
+}
+EXPORT_SYMBOL(of_device_is_fail);
+
/**
* of_device_is_big_endian - check if a device has BE registers
*
diff --git a/include/linux/of.h b/include/linux/of.h
index 6a9ddf20e79a..463fbf0072bd 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -350,6 +350,7 @@ extern int of_device_is_compatible(const struct device_node *device,
extern int of_device_compatible_match(const struct device_node *device,
const char *const *compat);
extern bool of_device_is_available(const struct device_node *device);
+extern bool of_device_is_fail(const struct device_node *device);
extern bool of_device_is_big_endian(const struct device_node *device);
extern const void *of_get_property(const struct device_node *node,
const char *name,
@@ -584,6 +585,11 @@ static inline bool of_device_is_available(const struct device_node *device)
return false;
}
+static inline bool of_device_is_fail(const struct device_node *device)
+{
+ return false;
+}
+
static inline bool of_device_is_big_endian(const struct device_node *device)
{
return false;
--
2.42.0.869.gea05f2083d-goog
