device property: Return -ENXIO if there is no suitable FW interface

Return -ENXIO if device property array access functions don't find
a suitable firmware interface.

This lets drivers decide if they should use available platform data
instead.

Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/base/property.c

@@ -155,6 +155,7 @@ EXPORT_SYMBOL_GPL(fwnode_property_present);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u8_array(struct device *dev, const char *propname,
 				  u8 *val, size_t nval)
@@ -179,6 +180,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u8_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u16_array(struct device *dev, const char *propname,
 				   u16 *val, size_t nval)
@@ -203,6 +205,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u16_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u32_array(struct device *dev, const char *propname,
 				   u32 *val, size_t nval)
@@ -227,6 +230,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u32_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO if the property is not an array of numbers,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_u64_array(struct device *dev, const char *propname,
 				   u64 *val, size_t nval)
@@ -251,6 +255,7 @@ EXPORT_SYMBOL_GPL(device_property_read_u64_array);
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO or %-EILSEQ if the property is not an array of strings,
  *	   %-EOVERFLOW if the size of the property is not as expected.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_string_array(struct device *dev, const char *propname,
 				      const char **val, size_t nval)
@@ -272,6 +277,7 @@ EXPORT_SYMBOL_GPL(device_property_read_string_array);
  *	   %-EINVAL if given arguments are not valid,
  *	   %-ENODATA if the property does not have a value,
  *	   %-EPROTO or %-EILSEQ if the property type is not a string.
+ *	   %-ENXIO if no suitable firmware interface is present.
  */
 int device_property_read_string(struct device *dev, const char *propname,
 				const char **val)
@@ -293,9 +299,11 @@ EXPORT_SYMBOL_GPL(device_property_read_string);
 	else if (is_acpi_node(_fwnode_)) \
 		_ret_ = acpi_dev_prop_read(to_acpi_node(_fwnode_), _propname_, \
 					   _proptype_, _val_, _nval_); \
-	else \
+	else if (is_pset(_fwnode_)) \
 		_ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \
 					     _proptype_, _val_, _nval_); \
+	else \
+		_ret_ = -ENXIO; \
 	_ret_; \
 })
 
@@ -433,9 +441,10 @@ int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
 	else if (is_acpi_node(fwnode))
 		return acpi_dev_prop_read(to_acpi_node(fwnode), propname,
 					  DEV_PROP_STRING, val, nval);
-
-	return pset_prop_read_array(to_pset(fwnode), propname,
-				    DEV_PROP_STRING, val, nval);
+	else if (is_pset(fwnode))
+		return pset_prop_read_array(to_pset(fwnode), propname,
+					    DEV_PROP_STRING, val, nval);
+	return -ENXIO;
 }
 EXPORT_SYMBOL_GPL(fwnode_property_read_string_array);