From: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> The ACPI _DSD hierarchical data extension [1] makes it possible to have hierarchies deeper than one level in similar way than DT allows. These "subsubnodes" have not been accessible because device property implementation only provides device_get_next_child_node() that is limited to direct descendants of a device. We need this ability in order support things like remote endpoints currently supported in DT with of_graph_* APIs. Modify acpi_get_next_subnode() to accept fwnode handle instead and update callers accordingly. Also add a new function fwnode_get_next_child_node() that works directly with fwnodes and modify device_get_next_child_node() to call it directly. While there add a macro fwnode_for_each_child_node() analogous to the current device_for_each_child_node() but it works with fwnodes instead of devices. [1] http://www.uefi.org/sites/default/files/resources/_DSD-hierarchical-data-extension-UUID-v1.pdf Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> --- drivers/acpi/property.c | 27 +++++++++++++++++---------- drivers/base/property.c | 38 ++++++++++++++++++++++++++++++-------- include/linux/acpi.h | 8 ++++---- include/linux/property.h | 6 ++++++ 4 files changed, 57 insertions(+), 22 deletions(-) diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c index 587c9d0..8730ce7 100644 --- a/drivers/acpi/property.c +++ b/drivers/acpi/property.c @@ -880,21 +880,22 @@ int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname, } /** - * acpi_get_next_subnode - Return the next child node handle for a device. - * @dev: Device to find the next child node for. + * acpi_get_next_subnode - Return the next child node handle for a fwnode + * @fwnode: Firmware node to find the next child node for. * @child: Handle to one of the device's child nodes or a null handle. */ -struct fwnode_handle *acpi_get_next_subnode(struct device *dev, +struct fwnode_handle *acpi_get_next_subnode(struct fwnode_handle *fwnode, struct fwnode_handle *child) { - struct acpi_device *adev = ACPI_COMPANION(dev); + struct acpi_device *adev = to_acpi_device_node(fwnode); struct list_head *head, *next; - if (!adev) - return NULL; - if (!child || child->type == FWNODE_ACPI) { - head = &adev->children; + if (adev) + head = &adev->children; + else + goto nondev; + if (list_empty(head)) goto nondev; @@ -903,7 +904,6 @@ struct fwnode_handle *acpi_get_next_subnode(struct device *dev, next = adev->node.next; if (next == head) { child = NULL; - adev = ACPI_COMPANION(dev); goto nondev; } adev = list_entry(next, struct acpi_device, node); @@ -915,9 +915,16 @@ struct fwnode_handle *acpi_get_next_subnode(struct device *dev, nondev: if (!child || child->type == FWNODE_ACPI_DATA) { + struct acpi_data_node *data = to_acpi_data_node(fwnode); struct acpi_data_node *dn; - head = &adev->data.subnodes; + if (adev) + head = &adev->data.subnodes; + else if (data) + head = &data->data.subnodes; + else + return NULL; + if (list_empty(head)) return NULL; diff --git a/drivers/base/property.c b/drivers/base/property.c index 384998a..15403f7 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -892,24 +892,46 @@ struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode) EXPORT_SYMBOL_GPL(fwnode_get_parent); /** - * device_get_next_child_node - Return the next child node handle for a device - * @dev: Device to find the next child node for. - * @child: Handle to one of the device's child nodes or a null handle. + * fwnode_get_next_child_node - Return the next child node handle for a node + * @fwnode: Firmware node to find the next child node for. + * @child: Handle to one of the node's child nodes or a %NULL handle. */ -struct fwnode_handle *device_get_next_child_node(struct device *dev, +struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode, struct fwnode_handle *child) { - if (IS_ENABLED(CONFIG_OF) && dev->of_node) { + if (is_of_node(fwnode)) { struct device_node *node; - node = of_get_next_available_child(dev->of_node, to_of_node(child)); + node = of_get_next_available_child(to_of_node(fwnode), + to_of_node(child)); if (node) return &node->fwnode; - } else if (IS_ENABLED(CONFIG_ACPI)) { - return acpi_get_next_subnode(dev, child); + } else if (is_acpi_node(fwnode)) { + return acpi_get_next_subnode(fwnode, child); } + return NULL; } +EXPORT_SYMBOL_GPL(fwnode_get_next_child_node); + +/** + * device_get_next_child_node - Return the next child node handle for a device + * @dev: Device to find the next child node for. + * @child: Handle to one of the device's child nodes or a null handle. + */ +struct fwnode_handle *device_get_next_child_node(struct device *dev, + struct fwnode_handle *child) +{ + struct acpi_device *adev = ACPI_COMPANION(dev); + struct fwnode_handle *fwnode = NULL; + + if (dev->of_node) + fwnode = &dev->of_node->fwnode; + else if (adev) + fwnode = acpi_fwnode_handle(adev); + + return fwnode_get_next_child_node(fwnode, child); +} EXPORT_SYMBOL_GPL(device_get_next_child_node); /** diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 868f923..f6f8655 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -999,8 +999,8 @@ int acpi_node_prop_read(struct fwnode_handle *fwnode, const char *propname, int acpi_dev_prop_read(struct acpi_device *adev, const char *propname, enum dev_prop_type proptype, void *val, size_t nval); -struct fwnode_handle *acpi_get_next_subnode(struct device *dev, - struct fwnode_handle *subnode); +struct fwnode_handle *acpi_get_next_subnode(struct fwnode_handle *fwnode, + struct fwnode_handle *child); struct fwnode_handle *acpi_node_get_parent(struct fwnode_handle *fwnode); struct acpi_probe_entry; @@ -1118,8 +1118,8 @@ static inline int acpi_dev_prop_read(struct acpi_device *adev, return -ENXIO; } -static inline struct fwnode_handle *acpi_get_next_subnode(struct device *dev, - struct fwnode_handle *subnode) +static inline struct fwnode_handle * +acpi_get_next_subnode(struct fwnode_handle *fwnode, struct fwnode_handle *child) { return NULL; } diff --git a/include/linux/property.h b/include/linux/property.h index 85060bf..a3d4f52 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -71,6 +71,12 @@ int fwnode_property_match_string(struct fwnode_handle *fwnode, const char *propname, const char *string); struct fwnode_handle *fwnode_get_parent(struct fwnode_handle *fwnode); +struct fwnode_handle *fwnode_get_next_child_node(struct fwnode_handle *fwnode, + struct fwnode_handle *child); + +#define fwnode_for_each_child_node(fwnode, child) \ + for (child = fwnode_get_next_child_node(fwnode, NULL); child; \ + child = fwnode_get_next_child_node(fwnode, child)) struct fwnode_handle *device_get_next_child_node(struct device *dev, struct fwnode_handle *child); -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
