device property: Introduce fwnode_device_is_available()

Add fwnode_device_is_available() to tell whether the device corresponding
to a certain fwnode_handle is available for use.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index a24ca61294eb5b30b32a72ffc431151dc8e44fa1..917c789f953dfb280f6f00895ce1fcf7ae2484ec 100644 (file)
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -1121,6 +1121,14 @@ int acpi_graph_get_remote_endpoint(struct fwnode_handle *fwnode,
        return 0;
 }
 
+static bool acpi_fwnode_device_is_available(struct fwnode_handle *fwnode)
+{
+       if (!is_acpi_device_node(fwnode))
+               return false;
+
+       return acpi_device_is_present(to_acpi_device_node(fwnode));
+}
+
 static bool acpi_fwnode_property_present(struct fwnode_handle *fwnode,
                                         const char *propname)
 {
@@ -1216,6 +1224,7 @@ static int acpi_fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode,
 }
 
 const struct fwnode_operations acpi_fwnode_ops = {
+       .device_is_available = acpi_fwnode_device_is_available,
        .property_present = acpi_fwnode_property_present,
        .property_read_int_array = acpi_fwnode_property_read_int_array,
        .property_read_string_array = acpi_fwnode_property_read_string_array,

diff --git a/drivers/base/property.c b/drivers/base/property.c
index e1a58ac8840ea8d0d345a7607c9503a06cb75796..b979f8a2f4fbc2d519ebd070f2f19f3ff9a15e58 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1021,6 +1021,16 @@ void fwnode_handle_put(struct fwnode_handle *fwnode)
 }
 EXPORT_SYMBOL_GPL(fwnode_handle_put);
 
+/**
+ * fwnode_device_is_available - check if a device is available for use
+ * @fwnode: Pointer to the fwnode of the device.
+ */
+bool fwnode_device_is_available(struct fwnode_handle *fwnode)
+{
+       return fwnode_call_int_op(fwnode, device_is_available);
+}
+EXPORT_SYMBOL_GPL(fwnode_device_is_available);
+
 /**
  * device_get_child_node_count - return the number of child nodes for device
  * @dev: Device to cound the child nodes for

diff --git a/drivers/of/property.c b/drivers/of/property.c
index e859e41e33f3a4ac2c091999c154d79d2c914a52..c96389b7c6b32c64ee4a16270c8c87d9fadb1883 100644 (file)
--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -775,6 +775,11 @@ static void of_fwnode_put(struct fwnode_handle *fwnode)
        of_node_put(to_of_node(fwnode));
 }
 
+static bool of_fwnode_device_is_available(struct fwnode_handle *fwnode)
+{
+       return of_device_is_available(to_of_node(fwnode));
+}
+
 static bool of_fwnode_property_present(struct fwnode_handle *fwnode,
                                       const char *propname)
 {
@@ -895,6 +900,7 @@ static int of_fwnode_graph_parse_endpoint(struct fwnode_handle *fwnode,
 const struct fwnode_operations of_fwnode_ops = {
        .get = of_fwnode_get,
        .put = of_fwnode_put,
+       .device_is_available = of_fwnode_device_is_available,
        .property_present = of_fwnode_property_present,
        .property_read_int_array = of_fwnode_property_read_int_array,
        .property_read_string_array = of_fwnode_property_read_string_array,

diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index e315d867d631c584861c94921c92fcc5e5f73558..9ab37541918929d5d1db6b409615df305f07c727 100644 (file)
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -66,6 +66,7 @@ struct fwnode_endpoint {
 struct fwnode_operations {
        void (*get)(struct fwnode_handle *fwnode);
        void (*put)(struct fwnode_handle *fwnode);
+       bool (*device_is_available)(struct fwnode_handle *fwnode);
        bool (*property_present)(struct fwnode_handle *fwnode,
                                 const char *propname);
        int (*property_read_int_array)(struct fwnode_handle *fwnode,

diff --git a/include/linux/property.h b/include/linux/property.h
index 2f482616a2f22e2e26192a0a47a1c1b22d2bf015..7be014af78ed7ecd45b3dc9e26da20d028ed1145 100644 (file)
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -51,6 +51,7 @@ int device_property_read_string(struct device *dev, const char *propname,
 int device_property_match_string(struct device *dev,
                                 const char *propname, const char *string);
 
+bool fwnode_device_is_available(struct fwnode_handle *fwnode);
 bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname);
 int fwnode_property_read_u8_array(struct fwnode_handle *fwnode,
                                  const char *propname, u8 *val,