| Message ID | 20201019225903.14276-5-djrscally@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add functionality to ipu3-cio2 driver allowing software_node connections to sensors on platforms designed for Windows | expand |
On Mon, Oct 19, 2020 at 11:58:58PM +0100, Daniel Scally wrote: > From: Heikki Krogerus <heikki.krogerus@linux.intel.com> > > This implements the remaining .graph_* callbacks in the > fwnode operations vector for the software nodes. That makes > the fwnode_graph*() functions available in the drivers also > when software nodes are used. > > The implementation tries to mimic the "OF graph" as much as > possible, but there is no support for the "reg" device > property. The ports will need to have the index in their > name which starts with "port" (for example "port0", "port1", > ...) and endpoints will use the index of the software node > that is given to them during creation. The port nodes can > also be grouped under a specially named "ports" subnode, > just like in DT, if necessary. > > The remote-endpoints are reference properties under the > endpoint nodes that are named "remote-endpoint". FWIW, Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > Co-developed-by: Daniel Scally <djrscally@gmail.com> > Signed-off-by: Daniel Scally <djrscally@gmail.com> > --- > changes in v3: > - removed software_node_device_is_available > - moved the change to software_node_get_next_child to a separate > patch > - switched to use fwnode_handle_put() in graph_get_next_endpoint() > instead of software_node_put() > > changes in v2: > - added software_node_device_is_available > - altered software_node_get_next_child to get references > - altered software_node_get_next_endpoint to release references > to ports and avoid passing invalid combinations of swnodes to > software_node_get_next_child > - altered swnode_graph_find_next_port to release port rather than > old > drivers/base/swnode.c | 120 +++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 119 insertions(+), 1 deletion(-) > > diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c > index 741149b90..3732530ce 100644 > --- a/drivers/base/swnode.c > +++ b/drivers/base/swnode.c > @@ -536,6 +536,120 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode, > return 0; > } > > +static struct fwnode_handle * > +swnode_graph_find_next_port(const struct fwnode_handle *parent, > + struct fwnode_handle *port) > +{ > + struct fwnode_handle *old = port; > + > + while ((port = software_node_get_next_child(parent, old))) { > + if (!strncmp(to_swnode(port)->node->name, "port", 4)) > + return port; > + fwnode_handle_put(port); > + old = port; > + } > + > + return NULL; > +} > + > +static struct fwnode_handle * > +software_node_graph_get_next_endpoint(const struct fwnode_handle *fwnode, > + struct fwnode_handle *endpoint) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + struct fwnode_handle *old = endpoint; > + struct fwnode_handle *parent_of_old; > + struct fwnode_handle *parent; > + struct fwnode_handle *port; > + > + if (!swnode) > + return NULL; > + > + if (endpoint) { > + port = software_node_get_parent(endpoint); > + parent = software_node_get_parent(port); > + } else { > + parent = software_node_get_named_child_node(fwnode, "ports"); > + if (!parent) > + parent = software_node_get(&swnode->fwnode); > + > + port = swnode_graph_find_next_port(parent, NULL); > + } > + > + for (; port; port = swnode_graph_find_next_port(parent, port)) { > + if (old) { > + parent_of_old = software_node_get_parent(old); > + > + if (parent_of_old != port) > + old = NULL; > + > + fwnode_handle_put(parent_of_old); > + } > + > + endpoint = software_node_get_next_child(port, old); > + fwnode_handle_put(old); > + if (endpoint) > + break; > + > + fwnode_handle_put(port); > + } > + > + fwnode_handle_put(port); > + fwnode_handle_put(parent); > + > + return endpoint; > +} > + > +static struct fwnode_handle * > +software_node_graph_get_remote_endpoint(const struct fwnode_handle *fwnode) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + const struct software_node_ref_args *ref; > + const struct property_entry *prop; > + > + if (!swnode) > + return NULL; > + > + prop = property_entry_get(swnode->node->properties, "remote-endpoint"); > + if (!prop || prop->type != DEV_PROP_REF || prop->is_inline) > + return NULL; > + > + ref = prop->pointer; > + > + return software_node_get(software_node_fwnode(ref[0].node)); > +} > + > +static struct fwnode_handle * > +software_node_graph_get_port_parent(struct fwnode_handle *fwnode) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + struct fwnode_handle *parent; > + > + if (!strcmp(swnode->parent->node->name, "ports")) > + parent = &swnode->parent->parent->fwnode; > + else > + parent = &swnode->parent->fwnode; > + > + return software_node_get(parent); > +} > + > +static int > +software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode, > + struct fwnode_endpoint *endpoint) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + int ret; > + > + ret = kstrtou32(swnode->parent->node->name + 4, 10, &endpoint->port); > + if (ret) > + return ret; > + > + endpoint->id = swnode->id; > + endpoint->local_fwnode = fwnode; > + > + return 0; > +} > + > static const struct fwnode_operations software_node_ops = { > .get = software_node_get, > .put = software_node_put, > @@ -547,7 +661,11 @@ static const struct fwnode_operations software_node_ops = { > .get_parent = software_node_get_parent, > .get_next_child_node = software_node_get_next_child, > .get_named_child_node = software_node_get_named_child_node, > - .get_reference_args = software_node_get_reference_args > + .get_reference_args = software_node_get_reference_args, > + .graph_get_next_endpoint = software_node_graph_get_next_endpoint, > + .graph_get_remote_endpoint = software_node_graph_get_remote_endpoint, > + .graph_get_port_parent = software_node_graph_get_port_parent, > + .graph_parse_endpoint = software_node_graph_parse_endpoint, > }; > > /* -------------------------------------------------------------------------- */ > -- > 2.17.1 >
Hi Daniel, Heikki, Thanks for the patch. On Mon, Oct 19, 2020 at 11:58:58PM +0100, Daniel Scally wrote: > From: Heikki Krogerus <heikki.krogerus@linux.intel.com> > > This implements the remaining .graph_* callbacks in the > fwnode operations vector for the software nodes. That makes > the fwnode_graph*() functions available in the drivers also > when software nodes are used. > > The implementation tries to mimic the "OF graph" as much as > possible, but there is no support for the "reg" device > property. The ports will need to have the index in their > name which starts with "port" (for example "port0", "port1", > ...) and endpoints will use the index of the software node > that is given to them during creation. The port nodes can > also be grouped under a specially named "ports" subnode, > just like in DT, if necessary. > > The remote-endpoints are reference properties under the > endpoint nodes that are named "remote-endpoint". > > Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > Co-developed-by: Daniel Scally <djrscally@gmail.com> > Signed-off-by: Daniel Scally <djrscally@gmail.com> > --- > changes in v3: > - removed software_node_device_is_available > - moved the change to software_node_get_next_child to a separate > patch > - switched to use fwnode_handle_put() in graph_get_next_endpoint() > instead of software_node_put() > > changes in v2: > - added software_node_device_is_available > - altered software_node_get_next_child to get references > - altered software_node_get_next_endpoint to release references > to ports and avoid passing invalid combinations of swnodes to > software_node_get_next_child > - altered swnode_graph_find_next_port to release port rather than > old > drivers/base/swnode.c | 120 +++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 119 insertions(+), 1 deletion(-) > > diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c > index 741149b90..3732530ce 100644 > --- a/drivers/base/swnode.c > +++ b/drivers/base/swnode.c > @@ -536,6 +536,120 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode, > return 0; > } > > +static struct fwnode_handle * > +swnode_graph_find_next_port(const struct fwnode_handle *parent, > + struct fwnode_handle *port) > +{ > + struct fwnode_handle *old = port; > + > + while ((port = software_node_get_next_child(parent, old))) { software_node_get_next_child() doesn't drop the reference of the old child nor gets a reference to the returned node. Should it? The function to get a named child node does. It'd be nice if this was aligned. Or am I missing something? This isn't really a comment on this patch though.
On Tue, Oct 20, 2020 at 03:35:56PM +0300, Sakari Ailus wrote: > Hi Daniel, Heikki, > > Thanks for the patch. > > On Mon, Oct 19, 2020 at 11:58:58PM +0100, Daniel Scally wrote: > > From: Heikki Krogerus <heikki.krogerus@linux.intel.com> > > > > This implements the remaining .graph_* callbacks in the > > fwnode operations vector for the software nodes. That makes > > the fwnode_graph*() functions available in the drivers also > > when software nodes are used. > > > > The implementation tries to mimic the "OF graph" as much as > > possible, but there is no support for the "reg" device > > property. The ports will need to have the index in their > > name which starts with "port" (for example "port0", "port1", > > ...) and endpoints will use the index of the software node > > that is given to them during creation. The port nodes can > > also be grouped under a specially named "ports" subnode, > > just like in DT, if necessary. > > > > The remote-endpoints are reference properties under the > > endpoint nodes that are named "remote-endpoint". > > > > Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > > Co-developed-by: Daniel Scally <djrscally@gmail.com> > > Signed-off-by: Daniel Scally <djrscally@gmail.com> > > --- > > changes in v3: > > - removed software_node_device_is_available > > - moved the change to software_node_get_next_child to a separate > > patch > > - switched to use fwnode_handle_put() in graph_get_next_endpoint() > > instead of software_node_put() > > > > changes in v2: > > - added software_node_device_is_available > > - altered software_node_get_next_child to get references > > - altered software_node_get_next_endpoint to release references > > to ports and avoid passing invalid combinations of swnodes to > > software_node_get_next_child > > - altered swnode_graph_find_next_port to release port rather than > > old > > drivers/base/swnode.c | 120 +++++++++++++++++++++++++++++++++++++++++- > > 1 file changed, 119 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c > > index 741149b90..3732530ce 100644 > > --- a/drivers/base/swnode.c > > +++ b/drivers/base/swnode.c > > @@ -536,6 +536,120 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode, > > return 0; > > } > > > > +static struct fwnode_handle * > > +swnode_graph_find_next_port(const struct fwnode_handle *parent, > > + struct fwnode_handle *port) > > +{ > > + struct fwnode_handle *old = port; > > + > > + while ((port = software_node_get_next_child(parent, old))) { > > software_node_get_next_child() doesn't drop the reference of the old child > nor gets a reference to the returned node. Should it? > > The function to get a named child node does. > > It'd be nice if this was aligned. Or am I missing something? > > This isn't really a comment on this patch though. I didn't get this patch to my @linux.intel.com account so I guess it's our mail servers again... Anyway, please see my comments on that and ignore this one.
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c index 741149b90..3732530ce 100644 --- a/drivers/base/swnode.c +++ b/drivers/base/swnode.c @@ -536,6 +536,120 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode, return 0; } +static struct fwnode_handle * +swnode_graph_find_next_port(const struct fwnode_handle *parent, + struct fwnode_handle *port) +{ + struct fwnode_handle *old = port; + + while ((port = software_node_get_next_child(parent, old))) { + if (!strncmp(to_swnode(port)->node->name, "port", 4)) + return port; + fwnode_handle_put(port); + old = port; + } + + return NULL; +} + +static struct fwnode_handle * +software_node_graph_get_next_endpoint(const struct fwnode_handle *fwnode, + struct fwnode_handle *endpoint) +{ + struct swnode *swnode = to_swnode(fwnode); + struct fwnode_handle *old = endpoint; + struct fwnode_handle *parent_of_old; + struct fwnode_handle *parent; + struct fwnode_handle *port; + + if (!swnode) + return NULL; + + if (endpoint) { + port = software_node_get_parent(endpoint); + parent = software_node_get_parent(port); + } else { + parent = software_node_get_named_child_node(fwnode, "ports"); + if (!parent) + parent = software_node_get(&swnode->fwnode); + + port = swnode_graph_find_next_port(parent, NULL); + } + + for (; port; port = swnode_graph_find_next_port(parent, port)) { + if (old) { + parent_of_old = software_node_get_parent(old); + + if (parent_of_old != port) + old = NULL; + + fwnode_handle_put(parent_of_old); + } + + endpoint = software_node_get_next_child(port, old); + fwnode_handle_put(old); + if (endpoint) + break; + + fwnode_handle_put(port); + } + + fwnode_handle_put(port); + fwnode_handle_put(parent); + + return endpoint; +} + +static struct fwnode_handle * +software_node_graph_get_remote_endpoint(const struct fwnode_handle *fwnode) +{ + struct swnode *swnode = to_swnode(fwnode); + const struct software_node_ref_args *ref; + const struct property_entry *prop; + + if (!swnode) + return NULL; + + prop = property_entry_get(swnode->node->properties, "remote-endpoint"); + if (!prop || prop->type != DEV_PROP_REF || prop->is_inline) + return NULL; + + ref = prop->pointer; + + return software_node_get(software_node_fwnode(ref[0].node)); +} + +static struct fwnode_handle * +software_node_graph_get_port_parent(struct fwnode_handle *fwnode) +{ + struct swnode *swnode = to_swnode(fwnode); + struct fwnode_handle *parent; + + if (!strcmp(swnode->parent->node->name, "ports")) + parent = &swnode->parent->parent->fwnode; + else + parent = &swnode->parent->fwnode; + + return software_node_get(parent); +} + +static int +software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode, + struct fwnode_endpoint *endpoint) +{ + struct swnode *swnode = to_swnode(fwnode); + int ret; + + ret = kstrtou32(swnode->parent->node->name + 4, 10, &endpoint->port); + if (ret) + return ret; + + endpoint->id = swnode->id; + endpoint->local_fwnode = fwnode; + + return 0; +} + static const struct fwnode_operations software_node_ops = { .get = software_node_get, .put = software_node_put, @@ -547,7 +661,11 @@ static const struct fwnode_operations software_node_ops = { .get_parent = software_node_get_parent, .get_next_child_node = software_node_get_next_child, .get_named_child_node = software_node_get_named_child_node, - .get_reference_args = software_node_get_reference_args + .get_reference_args = software_node_get_reference_args, + .graph_get_next_endpoint = software_node_graph_get_next_endpoint, + .graph_get_remote_endpoint = software_node_graph_get_remote_endpoint, + .graph_get_port_parent = software_node_graph_get_port_parent, + .graph_parse_endpoint = software_node_graph_parse_endpoint, }; /* -------------------------------------------------------------------------- */