diff mbox series

[07/18] software_node: Add support for fwnode_graph*() family of functions

Message ID 20201130133129.1024662-8-djrscally@gmail.com
State Superseded
Headers show
Series Add functionality to ipu3-cio2 driver allowing software_node connections to sensors on platforms designed for Windows | expand

Commit Message

Daniel Scally Nov. 30, 2020, 1:31 p.m. UTC
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>

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 since RFC v3:
	- Simplified software_node_get_next_endpoint() a little
	- Squared away references in software_node_get_next_endpoint()
	and swnode_graph_find_next_port(), since they were affected by
	the change to the earlier patch that had *get_next_child() also
	put the previous reference.
	- Dropped Andy's R-b, since the code changed.
changes in RFC 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 RFC 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 | 110 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 109 insertions(+), 1 deletion(-)

Comments

Daniel Scally Nov. 30, 2020, 11:34 p.m. UTC | #1
Hi Laurent

On 30/11/2020 16:25, Laurent Pinchart wrote:
> Hi Daniel and Heikki,
>
> Thank you for the patch.
>
> On Mon, Nov 30, 2020 at 01:31:18PM +0000, Daniel Scally wrote:
>> From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>>
>> From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>>
> There seems to be one From: line too many. You can drop the one in the
> commit message, git-format-patch will add it automatically.
Ah! Thanks, sorry about that
>> This implements the remaining .graph_* callbacks in the
>> fwnode operations vector for the software nodes. That makes
> s/vector/structure/ ?
Yeah, sure.
>> 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.
> I'm not very familiar with swnodes, but could we name ports port@n
> instead of portn to mimic OF nodes ?
Yes, I don't see any reason why not.
>
>> 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 since RFC v3:
>> 	- Simplified software_node_get_next_endpoint() a little
>> 	- Squared away references in software_node_get_next_endpoint()
>> 	and swnode_graph_find_next_port(), since they were affected by
>> 	the change to the earlier patch that had *get_next_child() also
>> 	put the previous reference.
>> 	- Dropped Andy's R-b, since the code changed.
>> changes in RFC 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 RFC 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 | 110 +++++++++++++++++++++++++++++++++++++++++-
>>  1 file changed, 109 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
>> index 9bd0bb77ad5b..0c7a8d6b9ea8 100644
>> --- a/drivers/base/swnode.c
>> +++ b/drivers/base/swnode.c
>> @@ -540,6 +540,110 @@ 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;
>> +		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;
>> +	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)) {
>> +		endpoint = software_node_get_next_child(port, old);
>> +		if (endpoint) {
>> +			fwnode_handle_put(port);
>> +			break;
>> +		}
>> +
>> +		/* No more endpoints for that port, so stop passing old */
>> +		old = NULL;
>> +	}
>> +
>> +	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 we use port@, s/4/5/. But I suppose we also want to support the case
> where a single port is used, with its name set to "port" ? The logic
> would then need to be a tad more complex. Not sure if the consistency is
> worth the additional complexity, up to you.
I'm conflicted; consistency is good but in my mind keeping the name as
"port@0" for a single port rather than dropping the suffix is the better
approach anyway.
>> +	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,
>> @@ -551,7 +655,11 @@ 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,
>>  };
>>  
>>  /* -------------------------------------------------------------------------- */
diff mbox series

Patch

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 9bd0bb77ad5b..0c7a8d6b9ea8 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -540,6 +540,110 @@  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;
+		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;
+	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)) {
+		endpoint = software_node_get_next_child(port, old);
+		if (endpoint) {
+			fwnode_handle_put(port);
+			break;
+		}
+
+		/* No more endpoints for that port, so stop passing old */
+		old = NULL;
+	}
+
+	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,
@@ -551,7 +655,11 @@  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,
 };
 
 /* -------------------------------------------------------------------------- */