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device connection: Prepare support for firmware described connections

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When the connections are defined in firmware, struct
device_connection will have the fwnode member pointing to
the device node (struct fwnode_handle) of the requested
device. The endpoint member for the device names will not be
used at all in that case.

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>
This commit is contained in:
Heikki Krogerus 2019-02-13 10:45:56 +03:00 committed by Greg Kroah-Hartman
parent 393cd68d0d
commit 80e04837a4
1 changed files with 24 additions and 0 deletions
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24
drivers/base/devcon.c
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@ -75,12 +75,36 @@ static struct bus_type *generic_match_buses[] = {
NULL,
};
static int device_fwnode_match(struct device *dev, void *fwnode)
{
return dev_fwnode(dev) == fwnode;
}
static void *device_connection_fwnode_match(struct device_connection *con)
{
struct bus_type *bus;
struct device *dev;
for (bus = generic_match_buses[0]; bus; bus++) {
dev = bus_find_device(bus, NULL, (void *)con->fwnode,
device_fwnode_match);
if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
return dev;
put_device(dev);
}
return NULL;
}
/* This tries to find the device from the most common bus types by name. */
static void *generic_match(struct device_connection *con, int ep, void *data)
{
struct bus_type *bus;
struct device *dev;
if (con->fwnode)
return device_connection_fwnode_match(con);
for (bus = generic_match_buses[0]; bus; bus++) {
dev = bus_find_device_by_name(bus, NULL, con->endpoint[ep]);
if (dev)