Merge branch 'acpi-driver-core' into device-properties
diff --git a/drivers/base/property.c b/drivers/base/property.c
index c458458..cf3b216 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -62,13 +62,14 @@
* device_property_read_u8_array - return a u8 array property of a device
* @dev: Device to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Function reads an array of u8 properties with @propname from the device
* firmware description and stores them to @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -85,13 +86,14 @@
* device_property_read_u16_array - return a u16 array property of a device
* @dev: Device to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Function reads an array of u16 properties with @propname from the device
* firmware description and stores them to @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -108,13 +110,14 @@
* device_property_read_u32_array - return a u32 array property of a device
* @dev: Device to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Function reads an array of u32 properties with @propname from the device
* firmware description and stores them to @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -131,13 +134,14 @@
* device_property_read_u64_array - return a u64 array property of a device
* @dev: Device to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Function reads an array of u64 properties with @propname from the device
* firmware description and stores them to @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -154,13 +158,14 @@
* device_property_read_string_array - return a string array property of device
* @dev: Device to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Function reads an array of string properties with @propname from the device
* firmware description and stores them to @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO or %-EILSEQ if the property is not an array of strings,
@@ -170,7 +175,8 @@
const char **val, size_t nval)
{
return IS_ENABLED(CONFIG_OF) && dev->of_node ?
- of_property_read_string_array(dev->of_node, propname, val, nval) :
+ (val ? of_property_read_string_array(dev->of_node, propname, val, nval)
+ : of_property_count_strings(dev->of_node, propname)) :
acpi_dev_prop_read(ACPI_COMPANION(dev), propname,
DEV_PROP_STRING, val, nval);
}
@@ -218,13 +224,14 @@
* fwnode_property_read_u8_array - return a u8 array property of firmware node
* @fwnode: Firmware node to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Read an array of u8 properties with @propname from @fwnode and stores them to
* @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -243,13 +250,14 @@
* fwnode_property_read_u16_array - return a u16 array property of firmware node
* @fwnode: Firmware node to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Read an array of u16 properties with @propname from @fwnode and store them to
* @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -268,13 +276,14 @@
* fwnode_property_read_u32_array - return a u32 array property of firmware node
* @fwnode: Firmware node to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Read an array of u32 properties with @propname from @fwnode store them to
* @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -293,13 +302,14 @@
* fwnode_property_read_u64_array - return a u64 array property firmware node
* @fwnode: Firmware node to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Read an array of u64 properties with @propname from @fwnode and store them to
* @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of numbers,
@@ -318,13 +328,14 @@
* fwnode_property_read_string_array - return string array property of a node
* @fwnode: Firmware node to get the property of
* @propname: Name of the property
- * @val: The values are stored here
+ * @val: The values are stored here or %NULL to return the number of values
* @nval: Size of the @val array
*
* Read an string list property @propname from the given firmware node and store
* them to @val if found.
*
- * Return: %0 if the property was found (success),
+ * Return: number of values if @val was %NULL,
+ * %0 if the property was found (success),
* %-EINVAL if given arguments are not valid,
* %-ENODATA if the property does not have a value,
* %-EPROTO if the property is not an array of strings,
@@ -336,8 +347,10 @@
size_t nval)
{
if (is_of_node(fwnode))
- return of_property_read_string_array(of_node(fwnode), propname,
- val, nval);
+ return val ?
+ of_property_read_string_array(of_node(fwnode), propname,
+ val, nval) :
+ of_property_count_strings(of_node(fwnode), propname);
else if (is_acpi_node(fwnode))
return acpi_dev_prop_read(acpi_node(fwnode), propname,
DEV_PROP_STRING, val, nval);