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| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2019-02-13 10:45:57 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-14 10:52:25 +0100 |
| commit | 637e9e52b185e5b10372366bd6db97f27cf3f202 (patch) | |
| tree | 675d146c1cf003cffdefcb154c0a1455ef82c193 /drivers/base | |
| parent | 6a0bbcf96b2273f110a14d11a5952527c5921191 (diff) | |
| download | linux-0-day-637e9e52b185e5b10372366bd6db97f27cf3f202.tar.gz linux-0-day-637e9e52b185e5b10372366bd6db97f27cf3f202.tar.xz | |
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/devcon.c | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c index 858b8d2f6ef89..04db9ae235e41 100644 --- a/drivers/base/devcon.c +++ b/drivers/base/devcon.c @@ -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) { |