ACPI / property: Extend fwnode_property_* to data-only subnodes

Modify is_acpi_node() to return "true" for ACPI data-only subnodes as
well as for ACPI device objects and change the name of to_acpi_node()
to to_acpi_device_node() so it is clear that it covers ACPI device
objects only.  Accordingly, introduce to_acpi_data_node() to cover
data-only subnodes in an analogous way.

With that, make the fwnode_property_* family of functions work with
ACPI data-only subnodes introduced previously.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>

5 files changed, 173 insertions, 61 deletions

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 333f9146d19e..e78551726acb 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -19,6 +19,11 @@
 
 #include "internal.h"
 
+static int acpi_data_get_property_array(struct acpi_device_data *data,
+                                        const char *name,
+                                        acpi_object_type type,
+                                        const union acpi_object **obj);
+
 /* ACPI _DSD device properties UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
 static const u8 prp_uuid[16] = {
         0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d,
@@ -191,8 +196,8 @@ static void acpi_init_of_compatible(struct acpi_device *adev)
         const union acpi_object *of_compatible;
         int ret;
 
-        ret = acpi_dev_get_property_array(adev, "compatible", ACPI_TYPE_STRING,
-                                          &of_compatible);
+        ret = acpi_data_get_property_array(&adev->data, "compatible",
+                                           ACPI_TYPE_STRING, &of_compatible);
         if (ret) {
                 ret = acpi_dev_get_property(adev, "compatible",
                                             ACPI_TYPE_STRING, &of_compatible);
@@ -320,8 +325,8 @@ void acpi_free_properties(struct acpi_device *adev)
 }
 
 /**
- * acpi_dev_get_property - return an ACPI property with given name
- * @adev: ACPI device to get property
+ * acpi_data_get_property - return an ACPI property with given name
+ * @data: ACPI device deta object to get the property from
  * @name: Name of the property
  * @type: Expected property type
  * @obj: Location to store the property value (if not %NULL)
@@ -330,26 +335,27 @@ void acpi_free_properties(struct acpi_device *adev)
  * object at the location pointed to by @obj if found.
  *
  * Callers must not attempt to free the returned objects.  These objects will be
- * freed by the ACPI core automatically during the removal of @adev.
+ * freed by the ACPI core automatically during the removal of @data.
  *
  * Return: %0 if property with @name has been found (success),
  *         %-EINVAL if the arguments are invalid,
  *         %-ENODATA if the property doesn't exist,
  *         %-EPROTO if the property value type doesn't match @type.
  */
-int acpi_dev_get_property(struct acpi_device *adev, const char *name,
-                          acpi_object_type type, const union acpi_object **obj)
+static int acpi_data_get_property(struct acpi_device_data *data,
+                                  const char *name, acpi_object_type type,
+                                  const union acpi_object **obj)
 {
         const union acpi_object *properties;
         int i;
 
-        if (!adev || !name)
+        if (!data || !name)
                 return -EINVAL;
 
-        if (!adev->data.pointer || !adev->data.properties)
+        if (!data->pointer || !data->properties)
                 return -ENODATA;
 
-        properties = adev->data.properties;
+        properties = data->properties;
         for (i = 0; i < properties->package.count; i++) {
                 const union acpi_object *propname, *propvalue;
                 const union acpi_object *property;
@@ -370,11 +376,50 @@ int acpi_dev_get_property(struct acpi_device *adev, const char *name,
         }
         return -ENODATA;
 }
+
+/**
+ * acpi_dev_get_property - return an ACPI property with given name.
+ * @adev: ACPI device to get the property from.
+ * @name: Name of the property.
+ * @type: Expected property type.
+ * @obj: Location to store the property value (if not %NULL).
+ */
+int acpi_dev_get_property(struct acpi_device *adev, const char *name,
+                          acpi_object_type type, const union acpi_object **obj)
+{
+        return adev ? acpi_data_get_property(&adev->data, name, type, obj) : -EINVAL;
+}
 EXPORT_SYMBOL_GPL(acpi_dev_get_property);
 
+static struct acpi_device_data *acpi_device_data_of_node(struct fwnode_handle *fwnode)
+{
+        if (fwnode->type == FWNODE_ACPI) {
+                struct acpi_device *adev = to_acpi_device_node(fwnode);
+                return &adev->data;
+        } else if (fwnode->type == FWNODE_ACPI_DATA) {
+                struct acpi_data_node *dn = to_acpi_data_node(fwnode);
+                return &dn->data;
+        }
+        return NULL;
+}
+
 /**
- * acpi_dev_get_property_array - return an ACPI array property with given name
- * @adev: ACPI device to get property
+ * acpi_node_prop_get - return an ACPI property with given name.
+ * @fwnode: Firmware node to get the property from.
+ * @propname: Name of the property.
+ * @valptr: Location to store a pointer to the property value (if not %NULL).
+ */
+int acpi_node_prop_get(struct fwnode_handle *fwnode, const char *propname,
+                       void **valptr)
+{
+        return acpi_data_get_property(acpi_device_data_of_node(fwnode),
+                                      propname, ACPI_TYPE_ANY,
+                                      (const union acpi_object **)valptr);
+}
+
+/**
+ * acpi_data_get_property_array - return an ACPI array property with given name
+ * @adev: ACPI data object to get the property from
  * @name: Name of the property
  * @type: Expected type of array elements
  * @obj: Location to store a pointer to the property value (if not NULL)
@@ -383,7 +428,7 @@ EXPORT_SYMBOL_GPL(acpi_dev_get_property);
  * ACPI object at the location pointed to by @obj if found.
  *
  * Callers must not attempt to free the returned objects.  Those objects will be
- * freed by the ACPI core automatically during the removal of @adev.
+ * freed by the ACPI core automatically during the removal of @data.
  *
  * Return: %0 if array property (package) with @name has been found (success),
  *         %-EINVAL if the arguments are invalid,
@@ -391,14 +436,15 @@ EXPORT_SYMBOL_GPL(acpi_dev_get_property);
  *         %-EPROTO if the property is not a package or the type of its elements
  *           doesn't match @type.
  */
-int acpi_dev_get_property_array(struct acpi_device *adev, const char *name,
-                                acpi_object_type type,
-                                const union acpi_object **obj)
+static int acpi_data_get_property_array(struct acpi_device_data *data,
+                                        const char *name,
+                                        acpi_object_type type,
+                                        const union acpi_object **obj)
 {
         const union acpi_object *prop;
         int ret, i;
 
-        ret = acpi_dev_get_property(adev, name, ACPI_TYPE_PACKAGE, &prop);
+        ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop);
         if (ret)
                 return ret;
 
@@ -413,7 +459,6 @@ int acpi_dev_get_property_array(struct acpi_device *adev, const char *name,
 
         return 0;
 }
-EXPORT_SYMBOL_GPL(acpi_dev_get_property_array);
 
 /**
  * acpi_dev_get_property_reference - returns handle to the referenced object
@@ -518,15 +563,9 @@ int acpi_dev_get_property_reference(struct acpi_device *adev,
 }
 EXPORT_SYMBOL_GPL(acpi_dev_get_property_reference);
 
-int acpi_dev_prop_get(struct acpi_device *adev, const char *propname,
-                      void **valptr)
-{
-        return acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
-                                     (const union acpi_object **)valptr);
-}
-
-int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
-                              enum dev_prop_type proptype, void *val)
+static int acpi_data_prop_read_single(struct acpi_device_data *data,
+                                      const char *propname,
+                                      enum dev_prop_type proptype, void *val)
 {
         const union acpi_object *obj;
         int ret;
@@ -535,7 +574,7 @@ int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
                 return -EINVAL;
 
         if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) {
-                ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_INTEGER, &obj);
+                ret = acpi_data_get_property(data, propname, ACPI_TYPE_INTEGER, &obj);
                 if (ret)
                         return ret;
 
@@ -560,7 +599,7 @@ int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
                         break;
                 }
         } else if (proptype == DEV_PROP_STRING) {
-                ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_STRING, &obj);
+                ret = acpi_data_get_property(data, propname, ACPI_TYPE_STRING, &obj);
                 if (ret)
                         return ret;
 
@@ -571,6 +610,12 @@ int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
         return ret;
 }
 
+int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
+                              enum dev_prop_type proptype, void *val)
+{
+        return adev ? acpi_data_prop_read_single(&adev->data, propname, proptype, val) : -EINVAL;
+}
+
 static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val,
                                        size_t nval)
 {
@@ -647,20 +692,22 @@ static int acpi_copy_property_array_string(const union acpi_object *items,
         return 0;
 }
 
-int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
-                       enum dev_prop_type proptype, void *val, size_t nval)
+static int acpi_data_prop_read(struct acpi_device_data *data,
+                               const char *propname,
+                               enum dev_prop_type proptype,
+                               void *val, size_t nval)
 {
         const union acpi_object *obj;
         const union acpi_object *items;
         int ret;
 
         if (val && nval == 1) {
-                ret = acpi_dev_prop_read_single(adev, propname, proptype, val);
+                ret = acpi_data_prop_read_single(data, propname, proptype, val);
                 if (!ret)
                         return ret;
         }
 
-        ret = acpi_dev_get_property_array(adev, propname, ACPI_TYPE_ANY, &obj);
+        ret = acpi_data_get_property_array(data, propname, ACPI_TYPE_ANY, &obj);
         if (ret)
                 return ret;
 
@@ -696,3 +743,28 @@ int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
         }
         return ret;
 }
+
+int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
+                       enum dev_prop_type proptype, void *val, size_t nval)
+{
+        return adev ? acpi_data_prop_read(&adev->data, propname, proptype, val, nval) : -EINVAL;
+}
+
+/**
+ * acpi_node_prop_read - retrieve the value of an ACPI property with given name.
+ * @fwnode: Firmware node to get the property from.
+ * @propname: Name of the property.
+ * @proptype: Expected property type.
+ * @val: Location to store the property value (if not %NULL).
+ * @nval: Size of the array pointed to by @val.
+ *
+ * If @val is %NULL, return the number of array elements comprising the value
+ * of the property.  Otherwise, read at most @nval values to the array at the
+ * location pointed to by @val.
+ */
+int acpi_node_prop_read(struct fwnode_handle *fwnode,  const char *propname,
+                        enum dev_prop_type proptype, void *val, size_t nval)
+{
+        return acpi_data_prop_read(acpi_device_data_of_node(fwnode),
+                                   propname, proptype, val, nval);
+}
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 2d75366c61e0..ca118169a6c5 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -134,7 +134,7 @@ bool fwnode_property_present(struct fwnode_handle *fwnode, const char *propname)
         if (is_of_node(fwnode))
                 return of_property_read_bool(to_of_node(fwnode), propname);
         else if (is_acpi_node(fwnode))
-                return !acpi_dev_prop_get(to_acpi_node(fwnode), propname, NULL);
+                return !acpi_node_prop_get(fwnode, propname, NULL);
 
         return !!pset_prop_get(to_pset(fwnode), propname);
 }
@@ -298,8 +298,8 @@ EXPORT_SYMBOL_GPL(device_property_read_string);
                 _ret_ = OF_DEV_PROP_READ_ARRAY(to_of_node(_fwnode_), _propname_, \
                                                _type_, _val_, _nval_); \
         else if (is_acpi_node(_fwnode_)) \
-                _ret_ = acpi_dev_prop_read(to_acpi_node(_fwnode_), _propname_, \
-                                           _proptype_, _val_, _nval_); \
+                _ret_ = acpi_node_prop_read(_fwnode_, _propname_, _proptype_, \
+                                            _val_, _nval_); \
         else if (is_pset(_fwnode_)) \
                 _ret_ = pset_prop_read_array(to_pset(_fwnode_), _propname_, \
                                              _proptype_, _val_, _nval_); \
@@ -440,8 +440,8 @@ int fwnode_property_read_string_array(struct fwnode_handle *fwnode,
                                                       propname, val, nval) :
                         of_property_count_strings(to_of_node(fwnode), propname);
         else if (is_acpi_node(fwnode))
-                return acpi_dev_prop_read(to_acpi_node(fwnode), propname,
-                                          DEV_PROP_STRING, val, nval);
+                return acpi_node_prop_read(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);
@@ -470,8 +470,8 @@ int fwnode_property_read_string(struct fwnode_handle *fwnode,
         if (is_of_node(fwnode))
                 return of_property_read_string(to_of_node(fwnode), propname, val);
         else if (is_acpi_node(fwnode))
-                return acpi_dev_prop_read(to_acpi_node(fwnode), propname,
-                                          DEV_PROP_STRING, val, 1);
+                return acpi_node_prop_read(fwnode, propname, DEV_PROP_STRING,
+                                           val, 1);
 
         return pset_prop_read_array(to_pset(fwnode), propname,
                                     DEV_PROP_STRING, val, 1);
@@ -495,7 +495,7 @@ struct fwnode_handle *device_get_next_child_node(struct device *dev,
         } else if (IS_ENABLED(CONFIG_ACPI)) {
                 struct acpi_device *node;
 
-                node = acpi_get_next_child(dev, to_acpi_node(child));
+                node = acpi_get_next_child(dev, to_acpi_device_node(child));
                 if (node)
                         return acpi_fwnode_handle(node);
         }
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 980c1f87866a..f43e808a49d9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2083,11 +2083,11 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
                                                 &flags);
                 if (!IS_ERR(desc))
                         active_low = flags & OF_GPIO_ACTIVE_LOW;
-        } else if (is_acpi_node(fwnode)) {
+        } else if (is_acpi_device_node(fwnode)) {
                 struct acpi_gpio_info info;
 
-                desc = acpi_get_gpiod_by_index(to_acpi_node(fwnode), propname, 0,
-                                               &info);
+                desc = acpi_get_gpiod_by_index(to_acpi_device_node(fwnode),
+                                               propname, 0, &info);
                 if (!IS_ERR(desc))
                         active_low = info.active_low;
         }
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index e0d7c193d6e0..e234725eadc7 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -425,15 +425,32 @@ static inline bool acpi_check_dma(struct acpi_device *adev, bool *coherent)
 
 static inline bool is_acpi_node(struct fwnode_handle *fwnode)
 {
+        return fwnode && (fwnode->type == FWNODE_ACPI
+                || fwnode->type == FWNODE_ACPI_DATA);
+}
+
+static inline bool is_acpi_device_node(struct fwnode_handle *fwnode)
+{
         return fwnode && fwnode->type == FWNODE_ACPI;
 }
 
-static inline struct acpi_device *to_acpi_node(struct fwnode_handle *fwnode)
+static inline struct acpi_device *to_acpi_device_node(struct fwnode_handle *fwnode)
 {
-        return is_acpi_node(fwnode) ?
+        return is_acpi_device_node(fwnode) ?
                 container_of(fwnode, struct acpi_device, fwnode) : NULL;
 }
 
+static inline bool is_acpi_data_node(struct fwnode_handle *fwnode)
+{
+        return fwnode && fwnode->type == FWNODE_ACPI_DATA;
+}
+
+static inline struct acpi_data_node *to_acpi_data_node(struct fwnode_handle *fwnode)
+{
+        return is_acpi_data_node(fwnode) ?
+                container_of(fwnode, struct acpi_data_node, fwnode) : NULL;
+}
+
 static inline struct fwnode_handle *acpi_fwnode_handle(struct acpi_device *adev)
 {
         return &adev->fwnode;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 7235c4851460..6be94ba4e980 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -49,7 +49,7 @@ static inline acpi_handle acpi_device_handle(struct acpi_device *adev)
         return adev ? adev->handle : NULL;
 }
 
-#define ACPI_COMPANION(dev)             to_acpi_node((dev)->fwnode)
+#define ACPI_COMPANION(dev)             to_acpi_device_node((dev)->fwnode)
 #define ACPI_COMPANION_SET(dev, adev)   set_primary_fwnode(dev, (adev) ? \
         acpi_fwnode_handle(adev) : NULL)
 #define ACPI_HANDLE(dev)                acpi_device_handle(ACPI_COMPANION(dev))
@@ -69,7 +69,7 @@ static inline acpi_handle acpi_device_handle(struct acpi_device *adev)
 
 static inline bool has_acpi_companion(struct device *dev)
 {
-        return is_acpi_node(dev->fwnode);
+        return is_acpi_device_node(dev->fwnode);
 }
 
 static inline void acpi_preset_companion(struct device *dev,
@@ -461,7 +461,22 @@ static inline bool is_acpi_node(struct fwnode_handle *fwnode)
         return false;
 }
 
-static inline struct acpi_device *to_acpi_node(struct fwnode_handle *fwnode)
+static inline bool is_acpi_device_node(struct fwnode_handle *fwnode)
+{
+        return false;
+}
+
+static inline struct acpi_device *to_acpi_device_node(struct fwnode_handle *fwnode)
+{
+        return NULL;
+}
+
+static inline bool is_acpi_data_node(struct fwnode_handle *fwnode)
+{
+        return false;
+}
+
+static inline struct acpi_data_node *to_acpi_data_node(struct fwnode_handle *fwnode)
 {
         return NULL;
 }
@@ -743,17 +758,16 @@ struct acpi_reference_args {
 #ifdef CONFIG_ACPI
 int acpi_dev_get_property(struct acpi_device *adev, const char *name,
                           acpi_object_type type, const union acpi_object **obj);
-int acpi_dev_get_property_array(struct acpi_device *adev, const char *name,
-                                acpi_object_type type,
-                                const union acpi_object **obj);
 int acpi_dev_get_property_reference(struct acpi_device *adev,
                                     const char *name, size_t index,
                                     struct acpi_reference_args *args);
 
-int acpi_dev_prop_get(struct acpi_device *adev, const char *propname,
-                      void **valptr);
+int acpi_node_prop_get(struct fwnode_handle *fwnode, const char *propname,
+                       void **valptr);
 int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname,
                               enum dev_prop_type proptype, void *val);
+int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname,
+                        enum dev_prop_type proptype, void *val, size_t nval);
 int acpi_dev_prop_read(struct acpi_device *adev, const char *propname,
                        enum dev_prop_type proptype, void *val, size_t nval);
 
@@ -766,13 +780,7 @@ static inline int acpi_dev_get_property(struct acpi_device *adev,
 {
         return -ENXIO;
 }
-static inline int acpi_dev_get_property_array(struct acpi_device *adev,
-                                              const char *name,
-                                              acpi_object_type type,
-                                              const union acpi_object **obj)
-{
-        return -ENXIO;
-}
+
 static inline int acpi_dev_get_property_reference(struct acpi_device *adev,
                                 const char *name, const char *cells_name,
                                 size_t index, struct acpi_reference_args *args)
@@ -780,6 +788,13 @@ static inline int acpi_dev_get_property_reference(struct acpi_device *adev,
         return -ENXIO;
 }
 
+static inline int acpi_node_prop_get(struct fwnode_handle *fwnode,
+                                     const char *propname,
+                                     void **valptr)
+{
+        return -ENXIO;
+}
+
 static inline int acpi_dev_prop_get(struct acpi_device *adev,
                                     const char *propname,
                                     void **valptr)
@@ -795,6 +810,14 @@ static inline int acpi_dev_prop_read_single(struct acpi_device *adev,
         return -ENXIO;
 }
 
+static inline int acpi_node_prop_read(struct fwnode_handle *fwnode,
+                                      const char *propname,
+                                      enum dev_prop_type proptype,
+                                      void *val, size_t nval)
+{
+        return -ENXIO;
+}
+
 static inline int acpi_dev_prop_read(struct acpi_device *adev,
                                      const char *propname,
                                      enum dev_prop_type proptype,