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Subject[RFC PATCH 5/5] drivers core: Find device connections also from device graphs
Date
If connections between devices are described in OF graph or
ACPI device graph, we can find them by using the
fwnode_graph_*() functions.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/base/devcon.c | 48 ++++++++++++++++++++++++++++++++++++++++---
1 file changed, 45 insertions(+), 3 deletions(-)

diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index d427e806cd73..9c446ef84dd1 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -7,10 +7,45 @@
*/

#include <linux/device.h>
+#include <linux/property.h>

static DEFINE_MUTEX(devcon_lock);
static LIST_HEAD(devcon_list);

+static void *
+fwnode_graph_devcon_match(struct fwnode_handle *fwnode,
+ const char *con_id, void *data,
+ void *(*match)(struct device_connection *con,
+ int ep, void *data))
+{
+ struct device_connection con = { .id = con_id };
+ struct fwnode_handle *ep;
+ const char *val;
+ void *ret;
+ int err;
+
+ fwnode_graph_for_each_endpoint(fwnode, ep) {
+ con.fwnode = fwnode_graph_get_remote_port_parent(ep);
+
+ if (con_id) {
+ err = fwnode_property_read_string(con.fwnode, "name",
+ &val);
+ if (err || strcmp(con_id, val)) {
+ fwnode_handle_put(con.fwnode);
+ continue;
+ }
+ }
+
+ ret = match(&con, -1, data);
+ fwnode_handle_put(con.fwnode);
+ if (ret) {
+ fwnode_handle_put(ep);
+ return ret;
+ }
+ }
+ return NULL;
+}
+
/**
* device_connection_find_match - Find physical connection to a device
* @dev: Device with the connection
@@ -23,10 +58,11 @@ static LIST_HEAD(devcon_list);
* caller is expecting to be returned.
*/
void *device_connection_find_match(struct device *dev, const char *con_id,
- void *data,
- void *(*match)(struct device_connection *con,
- int ep, void *data))
+ void *data,
+ void *(*match)(struct device_connection *con,
+ int ep, void *data))
{
+ struct fwnode_handle *fwnode = dev_fwnode(dev);
const char *devname = dev_name(dev);
struct device_connection *con;
void *ret = NULL;
@@ -35,6 +71,12 @@ void *device_connection_find_match(struct device *dev, const char *con_id,
if (!match)
return NULL;

+ if (fwnode) {
+ ret = fwnode_graph_devcon_match(fwnode, con_id, data, match);
+ if (ret)
+ return ret;
+ }
+
mutex_lock(&devcon_lock);

list_for_each_entry(con, &devcon_list, list) {
--
2.19.1
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