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device connection: Find device connections also from device graphs 

If connections between devices are described in OF graph or
ACPI device graph, we can find them by using the
fwnode_graph_*() functions.

Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jun Li <jun.li@nxp.com>
Tested-by: Jun Li <jun.li@nxp.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Heikki Krogerus 2019-02-13 10:45:57 +03:00 committed by Greg Kroah-Hartman
parent 6a0bbcf96b
commit 637e9e52b1
1 changed files with 35 additions and 3 deletions
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38
drivers/base/devcon.c
View File

@ -7,10 +7,37 @@
*/
#include <linux/device.h>
#include <linux/property.h>
static DEFINE_MUTEX(devcon_lock);
static LIST_HEAD(devcon_list);
typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
void *data);
static void *
fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id,
void *data, devcon_match_fn_t match)
{
struct device_connection con = { .id = con_id };
struct fwnode_handle *ep;
void *ret;
fwnode_graph_for_each_endpoint(fwnode, ep) {
con.fwnode = fwnode_graph_get_remote_port_parent(ep);
if (!fwnode_device_is_available(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 +50,9 @@ 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, devcon_match_fn_t match)
{
struct fwnode_handle *fwnode = dev_fwnode(dev);
const char *devname = dev_name(dev);
struct device_connection *con;
void *ret = NULL;
@ -35,6 +61,12 @@ 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) {